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    Table of Contents
  1. Intro
  2. Design
    1. Style
    2. Comfort
    3. Controls
    4. Stability
    5. Portability
    6. Case
    7. Build Quality
    8. Breathability
    9. Cable
    10. Front
    11. Angled
    12. Side
    13. Rear
    14. Top
  3. Sound
    1. Bass
    2. Mid
    3. Treble
    4. Frequency Response Consistency
    5. Raw Frequency Response
    6. Soundstage
    7. Imaging
    8. Total Harmonic Distortion
  4. Isolation
    1. Noise Isolation
    2. Leakage
  5. Active Features
    1. Wireless Range
    2. Latency
    3. Battery
    4. App Support
  6. In the box
  7. Conclusion
  8. Q&A
Reviewed on Jun 15, 2017 , Marc Henney, Yannick Khong

Sennheiser RS 175 RF HDR
HEADPHONES REVIEW

Usage Ratings - Version 1.1
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Test Benches:

  • 1.1: Summer 2017
  • 1.0: Winter 2017
  • 0.9: Winter 2016
6.3Mixed Usage
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What it is This is the combination of the different use cases to evaluate how versatile the headphones are. Therefore an everyday headphone should be well-rounded enough to adapt to most situations and environments without significant losses in sound quality, design ergonomics or isolation.
Score components:
6.8Critical Listening
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What it is The level of audio fidelity a headphone can reproduce. Therefore a balanced and true representation of bass, mids, treble, soundstage and imaging, as well as a comfortable listening experience, is essential for critical listening.
Score components:
6.1Commute/Travel
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What it is How well the headphones handle the loud environments involved in commuting or traveling. Therefore your listening experience should be comfortable, hassle-free and as isolated from noise as possible.
5.3Sports/Fitness
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What it is How well-adapted the headphones are, to use while doing sports or strenuous exercise. Therefore the headphones should not be too cumbersome and deliver a stable and comfortable listening experience.
6.8Office
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What it is How well the headphones can deliver a comfortable and isolated listening experience in an office-like environment. They should not leak much and should block the noise of a busy office.
Score components:
7.3Home Theater
Type : Over-ear
Enclosure : Closed-Back
Wireless : Yes
Noise-Cancelling : No
Mic : No
Transducer : Dynamic

The Sennheiser RS 175 have the same design and build quality as the RS 165 but sound a bit worse for critical listening. They don't do as well with voices and instruments, and they have a bit too much bass. They're also not versatile enough to use anywhere but indoors in direct line-of-sight of the transmitter. On the upside, they're comfortable and have low latency for watching movies.

Test Results
Design 5.9
Sound 6.8
Isolation 5.5
Active Features 7.0
Pros
  • Low latency connection.
  • Decent sound quality.
Cons
  • Poor isolation and high leakage.
  • Limited range and usability.
Update 8/10/2017: Converted to Test Bench 1.1. Learn more about our new versioned test bench system here.

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5.9

Design

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Score components:
Sennheiser RS 175 Design Picture

The RS 175 are almost identical to the RS 165. They have a few minor changes; they're a bit heavier and have a slightly different texture on the back of the ear cups. They also have an additional button to enable their surround sound feature on the right ear cup and their stand. They're decently well built and comfortable, but they're not stable enough for outdoor use. They also feel a bit cheap when compared to other headphones in their price range. 

Style
Sennheiser RS 175 Design Picture 2

The RS 175 have the same form factor as the 165 and the rest of the RS series from Sennheiser. They come with a TR transmitter stand that also acts as a dock and a charging station. They have slightly different ear cups than the previous model with a textured finish on the back of the ear cups and an additional button for the surround sound effect. They're a bit bulky and not meant for outdoor use, so they're not the most fashionable headphones, but their simple and utilitarian design will work for most.

7.5 Comfort
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What it is: Adjustability and degrees of freedom, pressure, stiffness and weight.
When it matters: When the headphones are going to be used for long durations.
Score components: Subjectively assigned
Sennheiser RS 175 Comfort Picture
Weight : 0.65 lbs
Clamping Force
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What it is: The force that the headphones exert on your head, once you have them on. This is purely a measurement of the force applied, which does not take into account the earpad's surface area and the resulting pressure you will feel, on or around your ears.
When it matters: The tighter the headphones, the more force they put on your head. This can get uncomfortable or cause pain and soreness during long listening sessions.
:
1.1 lbs

The RS 175 have the same comfortable fit as the RS 165, but they're slightly heavier. Like the 165 they have spacious ear cups that are decently well padded. Unfortunately, they also have the same problem as the pressure they exert around your ears is not properly distributed. So after listening to them for a while, you might start feeling a little soreness between your ear lobes and your jaw. It's not painfully uncomfortable, but it's not ideal either.

6.6 Controls
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What it is: The control scheme of the headphones, the number of functions provided, button layout and ergonomics as well as the quality of tactile feedback.
When it matters: If you want to control volume, pause your music or make phone calls without directly interacting with your audio device.
Sennheiser RS 175 Controls Picture
Ease of use : Good
Feedback : Good
Call/Music Control : No
Volume Control : Yes
Noise Canceling Control : N/A
Talk-Through : N/A
Additional Buttons : Room Effects

The RS 175 have an efficient controls scheme, but it's slightly limited. The buttons are responsive and provide basic functionality for volume control and two extra buttons for additional bass, and surround sound. However, they don't have any call/music functions, which is a bit disappointing but by design, they're not supposed to.

5.5 Stability
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What it is: How the headphones are designed to prevent them from slipping off your ears or falling off your head.
When it matters: If you plan on using the headphones while doing sports or other physical activities that requires a lot of movement.
Score components: Subjectively assigned
Sennheiser RS 175 Stability Picture

The RS 175 are not the most stable headphones. They're tight enough that they won't move much during casual listening sessions but unfortunately, their ear cups are heavier than those on the RS 165 and sway a lot under physical activity. This means they won't be good headphones for sports or working out. Also, they need to be in relative range to their charging dock so running in general with these headphones is impractical.

1.1 Portability
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What it is: The volume of space occupied by the headphones when folded into their most compact format.
When it matters: If you're often on the move and need to carry your headphones in a bag, purse , or pocket.
Score components:
Sennheiser RS 175 Portability Picture
L : 7.6 "
W : 7.6 "
H : 3.9 "
Volume : 225 Cu. Inches
Stand required : Yes

The RS 175 are not portable headphones. They're quite large and do not fold into a more compact format. Also, since you need the stand for them actually to work, you most likely won't carry them around on your person.

0 Case
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What it is: The provided carrying options to protect your headphones when transporting them.
When it matters: To prevent damaging your headphones, if you often carry them in your bag or pocket.
Score components: Subjectively assigned
Type : N/A
L : N/A
W : N/A
H : N/A
Volume : N/A

7.0 Build Quality
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What it is: Durability, material quality, cheap/expensive feel.
When it matters: When the headphones are going to be used by multiple users (classes/studios), by children, in tough conditions, on a daily basis, or for exercise.
Score components: Subjectively assigned
Sennheiser RS 175 Build Quality Picture

The RS 175 have a decently sturdy build quality. The headband is moderately flexible and reinforced with a thin metal frame. The ear cups too are decently dense, and a bit heavier than the RS 165 but aren't as durable as some of the other wireless over-ear headphones we've tested. The plastic used feels low grade and a bit cheap, so the ear cups might get damaged by a few accidental drops. The padding material also isn't as soft on the skin or as premium as some of the other headphones in their price range. It's a little disappointing, especially since you're going to be wearing these headphones for hours if you're watching a movie.

6.7 Breathability
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What it is: How hot the headphones get when you wear them for an extended period of time.
When it matters: If you often have long listening sessions or use your headphones while doing physical activities like running or working out.
Score components:
Sennheiser RS 175 Breathability Before Picture Sennheiser RS 175 Breathability After Picture
Avg.Temp.Difference : 4.8 C

Cable
Sennheiser RS 175 Cable Picture
Detachable : Yes
Length : 7 ft
Connection : 1/8" TRS

Comes with a 1/8" TRS audio cable, an optical audio cable and a power adapter for the TR 175 transmitter.

Front
Angled
Side
Rear
Top
6.8

Sound

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What it is: How accurately the audio is reproduced. The tests are performed with the headphones' most commonly used features enabled (noise-cancelling, wireless, etc.)
Sennheiser RS 175 Frequency Response

The RS 175 are average sounding closed-back headphones with an extended but excessive Bass, a recessed Mid range and a good Treble. However, their Bass consistency is poor and highly dependent on the fit/seal achieved by the user. They have a mediocre distortion performance, and a poor Soundstage which is due to their closed-back design. Additionally, our test unit's L/R drivers were poorly matched, and we noticed intermittent drops in volume during our testing.

7.3 Bass
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What it is: Frequency Response from 20Hz-250Hz
When it matters: When the material is heavy on bass frequencies, such as those of kick drums and bass guitar.
Score components:
Sennheiser RS 175 Bass
Std. Err.
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What it is: The amount of deviation (weighted standard error) in bass frequency response (20Hz-250Hz) as compared to a target response that would sound perfectly balanced to most people.
When it matters: When a balanced and neutral (reference) bass performance is desired.
Good value: <4dB
Noticeable difference: 0.1dB
:
3.99 dB
Low-Frequency Extension
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What it is: The lowest frequency at which the frequency response reaches -3dB of the target response.
When it matters: Shows how extended the bass is.
Good value: <40Hz
Noticeable difference: 5Hz
:
10 Hz
Low-Bass
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What it is: The average amount of over/under-emphasis in frequency response from 20Hz-60Hz.
When it matters: Kick drums and low frequency effects get their 'thump' from this range. Mostly felt than heard.
Good value: +/-3dB
Noticeable difference: 0.1dB
:
6.54 dB
Bass
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What it is: The average amount of over/under-emphasis in frequency response from 60Hz-120Hz.
When it matters: Melodic bass instruments have most of their fundamental frequencies in this range. This is where the 'body' and 'punch' of the bass sits.
Good value: +/-3dB
Noticeable difference: 0.1dB
:
3.95 dB
High-Bass
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What it is: The average amount of over/under-emphasis in frequency response from 120Hz-250Hz.
When it matters: Most instruments get their warmth and full-ness from this range. When over-emphasized, mixes tend to get muddy and boomy.
Good value: +/-3dB
Noticeable difference: 0.1dB
:
-0.3 dB

Decent Bass Range performance. The entire range is tilted in favor of low-bass, which shows more than 6dB of overemphasis. This will make these headphones kick and rumble excessively, which would be unsuitable for certain music/films. Bass is also hyped by about 4dB, resulting in excess Bass which would drown out the Mid and Treble Ranges.

7.4 Mid
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What it is: Frequency Response from 250Hz-2KHz
When it matters: When the material is heavy on mid-range frequencies. This is the case for the majority of audio content.
Score components:
Sennheiser RS 175 Mid
Std. Err.
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What it is: The amount of deviation (weighted standard error) in mid frequency response (250Hz-2.5KHz) as compared to a target response that would sound perfectly balanced to most people.
When it matters: When a balanced and neutral (reference) mid performance is desired.
Good value: <4dB
Noticeable difference: 0.1dB
:
3.46 dB
Low-Mid
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What it is: The average amount of over/under-emphasis in frequency response from 250Hz-500Hz.
When it matters: Most instruments have their fundamentals or low harmonics in this range. Over-emphasis in this range sounds muddy and cluttered. Under-emphasis, thins out the vocals and lead instruments.
Good value: +/-3dB
Noticeable difference: 0.1dB
:
-4.6 dB
Mid
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What it is: The average amount of over/under-emphasis in frequency response from 500Hz-1KHz.
When it matters: This range is occupied mostly by upper harmonics. Over-emphasis sounds forward and boxy. Under-emphasis pushes instruments to the back of the mix.
Good value: +/-3dB
Noticeable difference: 0.1dB
:
-3.11 dB
High-Mid
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What it is: The average amount of over/under-emphasis in frequency response from 1KHz-2KHz.
When it matters: Most instruments, especially vocals, get their intensity and clarity from this range. Over-emphasis sounds honky and harsh, under-emphasis sounds weak and distant.
Good value: +/-3dB
Noticeable difference: 0.1dB
:
-1.2 dB

Decent Mid Range performance. The dip from 250Hz to 700Hz makes the body of vocals/leads a bit thin, and could also push them slightly to the back of the mix.

7.9 Treble
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What it is: Frequency Response from 2KHz-20KHz
When it matters: When the material is heavy on high-range frequencies, such as voice, cymbals, and any other material where brightness, brilliance and airiness is desired.
Score components:
Sennheiser RS 175 Treble
Std. Err.
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What it is: The amount of deviation (weighted standard error) in treble frequency response (2.5KHz-20KHz) as compared to a target response that would sound perfectly balanced to most people.
When it matters: When a balanced and neutral (reference) treble performance is desired.
Good value: <4dB
Noticeable difference: 0.1dB
:
3.59 dB
Low-Treble
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What it is: The average amount of over/under-emphasis in frequency response from 2KHz-5KHz.
When it matters: Almost all instruments rely on this range for their presence, detail, and articulation. Over-emphasis can sound harsh and painful. Under-emphasis hurts the comprehensibility of vocals and lead instruments.
Good value: +/-3dB
Noticeable difference: 0.1dB
:
2.07 dB
Treble
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What it is: The average amount of over/under emphasis in frequency response from 5KHz-10KHz.
When it matters: This is the sibilance range. Cymbals, vocals, and lead instruments rely on this range for brightness and presence. Over-emphasis sounds piercing and painful, under-emphasis sounds dull and lispy.
Good value: +/-3dB
Noticeable difference: 0.1dB
:
-3.63 dB
High-Treble
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What it is: The average amount of over/under-emphasis in frequency response from 10KHz-20KHz.
When it matters: This range gives brilliance and airiness to the sound. Over-emphasis sounds hissy, under-emphasis sounds closed-up and lifeless.
Good value: +/-3dB
Noticeable difference: 0.1dB
:
-4.35 dB

Good Treble Range performance. The response is relatively even and consistent. The 5dB peak around 3KHz, adds excess presence to vocals/leads. This and the excess Bass give a V shaped or smiley face sound profile to these headphones. Additionally, the small dip around 7KHz makes the sibilances (S and T sounds) slightly soft.

5.6 Frequency Response Consistency
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What it is: The amount of deviation of each frequency response pass, from the average frequency response.
When it matters: Shows how consistently the headphones perform after re-positioning them.
Score components:
Sennheiser RS 175 Consistency L Sennheiser RS 175 Consistency R
Avg. Std. Deviation
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What it is: The average amount of deviation in frequency response of 5 re-seats, from the average frequency response.
When it matters: Shows how consistently the headphones perform after re-positioning them.
Good value: <0.5
Noticeable difference: 0.1
:
1.16 dB

Poor Consistency performance. The ear pads on the RS 175 are relatively stiff, and we suspect they are the culprit for the poor Bass Range consistency here. The Bass Range of our Over-Ear and On-Ear headphones are measured on 5 different human subjects, 5 times each. In the graphs, each line represents an individual's average Bass response. We have measured about 18dB of variance at 20Hz between our subjects which is quite bad. The blue line represent one of our subjects that wears glasses.

5.6 Soundstage
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What it is: Soundstage qualities are not inherent to the audio content, the headphones have to 'create' them rather than 'reproduce' them. They determine whether the sound is perceived to be coming from inside or in front of the head, how open and spacious the soundstage is, how much the headphones acoustically interact with the environment, and how strong the phantom center is.
When it matters: When an accurately produced, large and spacious soundstage, similar to that of a stereo loudspeaker setup is desired.
PRTF Error
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What it is: The average amount of deviation in Pinna-Related Transfer Function of the headphones, compared to that of a loudspeaker. Whether the soundstage is perceived to be unnatural, located inside or in front of the head, is dependent on this quality. The more the headphones activate the HRTF resonances of the ear (similar to what loudspeakers do), the more the soundstage will be pulled out from inside the listener's head. This quality affects both stereo and mono content.
When it matters: When a natural, in-the-front soundstage is desired, similar to that of a loudspeaker.
Good value: <5
Noticeable difference: 0.5
:
6.5 dB
Openness
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What it is: How open the headphones are, and how open and spacious they sound. This quality affects both stereo and mono content. This test differentiates between acoustically and electronically produced crosstalk and only takes the acoustically generated crosstalk into account. This value is the inverse of the Noise Isolation test score.
When it matters: When an open, wide and roomy sound is desired. A value of 10 indicates a fully open headphone, and a value of 0 indicates a fully closed headphone.
Good value: >7.5
Noticeable difference: 0.5
:
5.3
Acoustic Space Excitation
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What it is: How loud the headphones are, and how much they excite their environment acoustically. If the headphones are loud and open enough, the sound leaking from the headphones takes some of the characteristic of its environment (reflections/reverb) before reflecting back into the open headphones and to the listener's ears. This quality affects both stereo and mono content. This value is the inverse of the Leakage test score.
When it matters: When an open, wide and roomy sound is desired.
Good value: >7.5
Noticeable difference: 0.5
:
5.0
Correlated Crosstalk
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What it is: How strong and solid the phantom center is. This is mostly a stereo quality and its effects on mono content are minimal. This test is sensitive to the phase of the crosstalk and whether it is produced acoustically or electronically.
When it matters: When a true reproduction of the stereo image is desired. A value of 0 indicates no crosstalk, or that the existing crosstalk is not correlated enough to affect the phantom center. A negative score means the crosstalk is out of phase with the original signal, resulting in a slightly wider stereo image at the expense of creating a 'hole' at the center of the stereo field. A positive score means the crosstalk is in phase and positively affecting the phantom center.
Good value: >1dB
Noticeable difference: 0.3dB
:
0.1 dB

Poor Soundstage. Due to their ear cup design, they don't interact with the pinna like loudspeakers do, which results in a Soundstage that is perceived inside the listener's head as opposed to in front. Also, due to the closed-back design, these headphones sound relatively isolating and won't let the outside ambience be mixed with the music, like open-back headphones would.

5.5 Imaging
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What it is: Imaging qualities are inherent to the audio content, the headphones have to 'reproduce' them rather than 'create' them. They determine how accurately the objects are positioned in the stereo image, and how transparent the imaging is.
When it matters: When accurate positioning of the objects in the stereo image, and clear and transparent imaging is desired.
Sennheiser RS 175 Phase Response
Phase Error
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What it is: The average amount of deviation in the phase, from the ideal flat response.
When it matters: When an accurate and transparent imaging is desired.
Good value: <60°
Noticeable difference: 10°
:
49.44 °
Driver Mismatch (Amplitude)
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What it is: The Left/Right balance of our test unit, that is, the amount of amplitude difference between the left and right drivers. This is not a design test, but a marker for manufacturing tolerance and ergonomics.
When it matters: When a properly balanced stereo image and low manufacturing tolerance is desired. A poor score indicates a noticeable difference in level between the left and right drivers.
Good value: <0.3dB
Noticeable difference: 0.1dB
:
3.12 dB
Driver Mismatch (Frequency)
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What it is: The amount of difference (Std. Err.) between the frequency response of the left and right drivers of our test unit. This is not a design test, but a marker for manufacturing tolerance and ergonomics.
When it matters: When an even and stable stereo image, as well as a low manufacturing tolerance, is desired. A poor score indicates there may be 'holes' in the stereo image at certain frequencies.
Good value: <2dB
Noticeable difference: 0.1dB
:
4.62 dB
Driver Mismatch (Phase)
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What it is: The amount of difference (Std. Err.) between the phase response of the left and right drivers of our test unit. This is not a design test, but a marker for manufacturing tolerance and ergonomics.
When it matters: When an even and stable stereo image, as well as a low manufacturing tolerance, is desired. A poor score indicates there may be inaccuracies in the stereo image reproduction at certain frequencies.
Good value: <90°
Noticeable difference: 30°
:
34.75 °

Poor Imaging. The amount of phase error is minimal and negligible, however, our test unit's driver matching was mediocre at best. We measured 3dB of amplitude mismatch between the L/R drivers of our test unit which is poor, as well as 4dB of frequency response mismatch and 35 degrees of phase mismatch.

6.0 Total Harmonic Distortion
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What it is: The subtle, unwanted frequencies (harmonics) produced alongside the intended frequencies.
When it matters: When clean and pure sound reproduction is desired, though its effect is not as noticable as frequency response.
Score components:
Sennheiser RS 175 Distortion
Weighted THD @ 90
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What it is: The overall amount of harmonic distortion measured at 90dB SPL. To make the score more perceptually relevant, more weight is given to the higher frequencies.
When it matters: How pure the sound is at moderate listening levels.
Good value: <0.100
Noticeable difference: 0.1
:
29.657
Weighted THD @ 100
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What it is: The overall amount of harmonic distortion measured at 100dB SPL. To make the score more perceptually relevant, more weight is given to the higher frequencies.
When it matters: How pure the sound is at loud listening levels.
Good value: <0.300
Noticeable difference: 0.1
:
46.111

Mediocre Harmonic Distortion performance. The RS 175 shows elevated levels of distortion in Bass and Mid ranges, especially at higher volumes. In the Treble range however, the amount of harmonic distortion is within good limits and not significantly affected by an increase in the volume.

5.5

Isolation

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Score components:

The RS 175 don't isolate well enough for loud environments.They can block some higher frequencies with the passive isolation of their ear cups. However, they don't have the best seal around your ears. Therefore, you will still be able to hear the ambient noise in your surroundings, even if your playing audio at relatively high volumes. Also, they're leakier than the RS 165 at higher volumes,  so they will be a bit more distracting to the people around you.

5.8 Noise Isolation
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What it is: How much outside noise is blocked out by putting the headphones on.
When it matters: If the headphones are going to be used in a noisy envinronment (airplane, subway, etc.)
Score components:
Sennheiser RS 175 Noise Isolation
Overall Attenuation
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What it is: The overall amount of environmental noise reduction in dB.
When it matters: In loud envinronments like planes, trains, offices, etc.
Good value: <-20dB
Noticeable difference: 1dB
:
-13.52 dB
Bass
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What it is: The overall amount of noise isolation in the bass range (20Hz-250Hz).
When it matters: When the outside noise is bass-heavy, like in airplanes.
Good value: <-15dB
Noticeable difference: 1dB
:
-1.21 dB
Mid
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What it is: The overall amount of noise isolation in the mid-range (250Hz-2.5KHz).
When it matters: When the environment's noise is mid-heavy, like in an office.
Good value: <-15dB
Noticeable difference: 1dB
:
-13.17 dB
Treble
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What it is: The overall amount of noise isolation in the treble range (2.5KHz-20KHz).
When it matters: When the environment's noise is treble-heavy. Although uncommon, areas with sharp sounds fall under this category.
Good value: <-30dB
Noticeable difference: 1dB
:
-27.32 dB
Self-Noise
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What it is: The amount of noise created by the active electronics of the headphones (if applicable), measured from 300Hz-20KHz. Applies mostly to wireless and noise-cancelling headphones.
When it matters: If too loud, it could become distracting when listening to quiet material like podcasts and audiobooks.
Good value: <16dB
Noticeable difference: 1dB
:
16.5 dB

Poor Isolation. These headphones don't have active noise cancelling and isolate passively using their ear cups. They start to kick-in around 150Hz, which is decent for passive over-ear headphones. In the Mid and Treble ranges they achieve about 13dB and 27dB of reduction, both values being decent.

5.0 Leakage
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What it is: The amount of sound bleeding out of the headphones.
When it matters: When the listener doesn't want people around them (in office, recording studio, etc.) to hear what is being listened to.
Score components:
Sennheiser RS 175 Leakage
Overall Leakage @ 1ft
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What it is: The amount of sound leakage heard 1 foot away from the user, while the user is listening to a 100dB SPL signal.
When it matters: When you don't want people hear what you are listening to.
Good value: <35dB
Noticeable difference: 1dB
:
49.63 dB

Poor Leakage performance. The stiff ear pads of the RS 175 seem to be responsible for the poor leakage of these headphones. The significant portion of the leakage sits between 300Hz and 5KHz, which is a relatively broad range. The overall level of the leakage is also relatively loud.

7.0

Active Features

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What it is: Headphones with active components that require a battery. This includes noise cancelling and wireless headphones that actively reduce noise or transmit audio via a wireless connection.
When it matters: How suitable the power and wireless specifications of an active headphone will be, depending on your listening habits. The range and/or discharge time of the active headphone you select will be important if you're often on the move or have long uninterrupted listening sessions.
Score components:

The Sennheiser RS 175 have low latency for watching movies and a good battery life. They use two rechargeable AAA batteries that can be charged directly with the stand. However, it takes really a long time to charge them that way and varies depending on the capacity, age, and wear of the batteries. Unfortunately, radio frequency headphones, like most of the RS series from Sennheiser, don't have the best range when obstructed so unless you're directly in front of your source you won't have the most stable and reliable wireless connection. 

7.2 Wireless Range
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What it is: Headphones that offer a cable-free listening experience over a wireless network, typically via Bluetooth or radio frequency.
When it matters: If you don't want to be limited by the length of an audio cable. This means having the freedom to move around in your home or office with a much greater range than an audio cable could provide, especially, if the Bluetooth source is heavy or difficult to carry.
Score components:
Type
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What it is: The type and version of the wireless network, the headphones use to connect to the audio source. This could either be Bluetooth or radio frequency.
When it matters: The Bluetooth version will determine how compatible the headphones are with your Bluetooth enabled devices. Typically, newer Bluetooth versions are backward compatible with older ones but may lack the additional features that more recent Bluetooth protocols provide.
:
Radio Frequency
Obstructed Range
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What it is: The range that the wireless headphones can reach before dropping any audio when the Bluetooth source was placed in another room.
When it matters: If you can't or prefer not to carry your Bluetooth source on you, while listening to your audio in an indoor environment. Although, the obstructed wireless range will slightly depend on your home or office layout.
Good value: >35ft
Noticeable difference: 5ft
:
28 ft
Line of Sight Range
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What it is: The range that the wireless headphones can reach before dropping any audio when in direct line of sight of the Bluetooth device.
When it matters: If you can't or prefer not to carry your Bluetooth source on you, while listening to your audio in a large and open environment.
Good value: 170ft or more
Noticeable difference: 10ft
:
122 ft
NFC
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What it is: Near Field Communication technology that allows you to quickly, pair your headphones with your Bluetooth and NFC-enabled device.
When it matters: This makes pairing with an NFC-enabled device a lot easier than the typical and often tedious hold-to-pair procedure that most wireless headphones have.
:
N/A

The RS lineup from Sennheiser uses radio frequency for their wireless connection instead of Bluetooth. For latency, it's great as they rarely have any sync issues when watching videos or gaming and they also connect immediately with their transmitter stand, so there is no need for pairing. Unfortunately, they don't perform as well regarding range. In direct line-of-sight, they do reasonably well, but once the stand is obstructed, the range is significantly reduced to about 30ft, which is a bit more than the RS 165 but not by much. You won't be able to walk around your home with the headphones on and continue listening to your audio. However, if you're directly in front of your TV or a fixed source, then the range shouldn't be much of an issue.

8.4 Latency
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What it is: The latency is how long it takes for audio to play through your headphones once the audio signal has been sent from a source.
When it matters: When gaming or watching movies. High latency means you will hear the audio much later than the images you see on screen.
Score components:
Base Latency
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What it is: The Base RF latency or the default sub-band coding (SBC) of most Bluetooth headphones.
When it matters: When watching videos a high latency can cause sync issues between the images you see and the audio you hear.
Good value: 50ms or less
Noticeable difference: 15ms
:
55 ms
aptX Latency
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What it is: An audio coding algorithm (Codec) that improves bit rate efficiency. It reduces latency and improves sound quality over Bluetooth.
When it matters: For better sound quality if your often streaming music over Bluetooth. Also it slightly improves latency when watching videos with wireless headphones.
Good value: 50ms or less
Noticeable difference: 15ms
:
N/A
aptX(LL) Latency
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What it is: Low latency variation of aptX that significantly reduces sync issues between video and sound when using Bluetooth headphones.
When it matters: When watching videos or gaming latency is a lot more noticeable than just listening to music.
Good value: 50ms or less
Noticeable difference: 5ms
:
N/A
7.2 Battery
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What it is: The power source of your headphones. All headphones with active features have a battery that will deplete over time.
When it matters: To continue using the active features of your headphones. Some models lose features or switch off completely when the battery is drained, which limits what you can do with them until the next charge.
Score components:
Battery Type
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What it is: The type of battery that the headphones use. Usually AAA or embedded, Li-ion rechargeable batteries.
When it matters: When your headphones run out of power. Rechargeable batteries usually charge via the headphones Micro-USB port whereas AAA batteries have to be replaced or charged with an external device.
:
AAA (X2)
Battery Life
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What it is: The amount of time it takes for a headphones' battery to be completely drained. Battery life will vary depending on the active features used and volume level.
When it matters: For active headphones that connect wirelessly, have noise cancellation or other audio-enhancing features, that cease to work once the battery is dead.
Good value: >10hrs
Noticeable difference: 0.5hrs
:
24 hrs
Charge Time
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What it is: The amount of time your active headphones have to be connected to a power source to charge from 0 to a 100%. However, charging time will vary depending on your power source.
When it matters: To be able to use the active features of your headphones. Especially, wireless ones that completely switch off and need to be recharged when the battery is dead.
Good value: 2h or less
Noticeable difference: 0.25h
:
N/A
Auto-off
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What it is: A feature that turns off the headphones, after a set time, when they're not in use.
When it matters: To prolong battery life when the headphones are not being used, or if you forget to manually turn off your headphones.
:
No
Audio while charging
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What it is: Some active headphones remain usable while charging. They continue to stream audio and do not disable other active features.
When it matters: This makes sure that your headphones's battery are not being drained when your relatively close to a power source. However, this means wireless headphones will need a wired connection to the power source during the charging process.
:
No
Passive Playback
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What it is: Active headphones that still work when all their active features are turned off or out of power.
When it matters: If you run out of power and do not have spare AA/AAA batteries or access to a power source to recharge your headphones.
:
No

The RS 175 like the 165 have a good 24-hour battery life. They also use rechargeable AAA batteries that can be charged with the stand but it takes more than 8 hours for a full charge which is very limiting. However, the charge time is heavily dependent on the capacity, age and wear of the rechargeable batteries you use, so your charge time will vary. Also, you can always just swap out the AAA with new non-rechargeable batteries which may be less cost effective but has 0 charge time.

0 App Support
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What it is: The additional app provided to enhance your listening experience. They typically deliver a set of practical features that give you more control over the sound, noise cancelling and effects that the headphones produce.
When it matters: An app with a lot of features allows you to customize your listening experience to suit your taste and preferences. For example, additions like an equalizer can give you more bass or treble and room effects can simulate a bigger Soundstage in closed back headphones.
Score components: Subjectively assigned
App Name : N/A
iOS : N/A
Android : N/A
Equalizer
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What it is: Parametric, graphic or preset sound profiles that slightly alter the frequency response.
When it matters: If you want to tailor, your listening experience. Depending on what you're listening to you may want more or less bass for some tracks or more mid-range for vocals-heavy audio.
:
N/A
ANC control
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What it is: Control over the Active noise canceling technology. This could be either a simple on/off button, and adjustable slider or even adaptive self-regulating noise cancellation.
When it matters: If you're in an environment where you need to monitor your surroundings or completely isolate yourself from ambient noise.
:
N/A
Room effects
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What it is: Room effects that enhance the audio quality to make it more immersive.
When it matters: If you want to further tweak your listening experience. Adding room effects, can simulate a more spacious Soundstage or deliver a surround sound-like feel.
:
N/A
Playback control
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What it is: An in-app player that gives you access to play/stop, track skipping or volume controls directly with the app.
When it matters: It's a shortcut that allows you to control your audio without leaving the application.
:
N/A

No compatible app.

In the box

Sennheiser RS 175 In the box Picture

  • Sennheiser RS 175 Headphones
  • TR 175 transmitter
  • Audio cable
  • Optical cable
  • (EU) power adapter
  • (UK) power adapter
  • (AU) power adapter
  • (US) power adapter
  • 2 AAA NiMH rechargeable batteries
  • Manual

Conclusion
SEE PRICE
Amazon.com

6.3Mixed Usage
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What it is This is the combination of the different use cases to evaluate how versatile the headphones are. Therefore an everyday headphone should be well-rounded enough to adapt to most situations and environments without significant losses in sound quality, design ergonomics or isolation.
Score components:
The Sennheiser RS 175 are good home theater headphones but only average for mixed usage. They're not versatile enough for all environments and situations, and the stand transmitter limits their use outdoors. If you're not in direct line-of-sight or close to your source and the transmitter, then the headphones are practically unusable.
6.8Critical Listening
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What it is The level of audio fidelity a headphone can reproduce. Therefore a balanced and true representation of bass, mids, treble, soundstage and imaging, as well as a comfortable listening experience, is essential for critical listening.
Score components:
Average for critical listening. These RS 175 are not as good for critical listening as the RS 165. They have a bit too much bass that makes them sound boomy, especially, since they lack a little mid-range. Instruments and vocals will be a bit more drowned out than on the RS 165. On the upside, they have a better treble and due to their bass and treble heavy response, they will sound exciting when watching movies you just might not hear the voices as well.
6.1Commute/Travel
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What it is How well the headphones handle the loud environments involved in commuting or traveling. Therefore your listening experience should be comfortable, hassle-free and as isolated from noise as possible.
Not suitable for commuting and traveling. The fact that you must have the transmitter in range means they won't be the ideal headphones to use anywhere but at home or at the office in front of your Tv or PC.
5.3Sports/Fitness
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What it is How well-adapted the headphones are, to use while doing sports or strenuous exercise. Therefore the headphones should not be too cumbersome and deliver a stable and comfortable listening experience.
Not intended for sports. They have a fixed transmitter, they're bulky and a bit unstable which is not ideal for running or working out.
6.8Office
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What it is How well the headphones can deliver a comfortable and isolated listening experience in an office-like environment. They should not leak much and should block the noise of a busy office.
Score components:
Average for office use. They have a decent line-of-sight range, they're comfortable and easy-to-use. However, they're a bit leaky and they don't isolate enough for particularly noisy office environments.
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Questions & Answers

1 ANSWERED QUESTIONS
0
What would you recommend for home tv/movies and games that is wireless as an alternative??
The Plantronics Backbeat Pro 2 would be the best suited for gaming and watching movies especially if you have a Bluetooth dongle with apt-X or apt-X (LL). You could also consider the Parrot Zik 2.0 they're a lot cheaper than the Zik 3.0 and they have a relatively fast Bluetooth connection without the additional aptX codecs.
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