- Table of Contents
- Intro
- Design
- Sound
- Isolation
- Active Features
- In the box
- Conclusion
- Discussions
Reviewed on Mar 23, 2016
By Sam Vafaei
, Marc Henney
Sennheiser MM 450-X
HEADPHONES REVIEW
Usage Ratings -
Version 0.9
Test Benches:
- 1.2: Winter 2018
- 1.1: Summer 2017
- 1.0: Winter 2017
- 0.9: Winter 2016
7.1
Mixed Usage
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:
- 25% Commute/Travel
- 25% Office
- 25% Sports/Fitness
- 25% Critical Listening
Score distribution:
7.0
Critical Listening
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 distribution:
6.9
Commute/Travel
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.
Score components:
- 26% Noise Isolation
- 11% Battery
- 10% Comfort
- 10% Portability
- 10% Build Quality
- 6% Wireless
- 5% Controls
- 5% Breathability
- 4% Bass
- 4% Mid
- 4% Treble
- 4% Leakage
- 1% Total Harmonic Distortion
Score distribution:
7.2
Sports/Fitness
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.
Score components:
- 23% Stability
- 22% Portability
- 9% Breathability
- 8% Comfort
- 8% Wireless
- 6% Controls
- 5% Noise Isolation
- 4% Battery
- 4% Bass
- 4% Leakage
- 3% Mid
- 3% Treble
- 1% Total Harmonic Distortion
Score distribution:
7.2
Office
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:
Score distribution:
6.7
Home Theater
Score components:
- 27% Latency
- 19% Sound
- 18% Comfort
- 14% Wireless
- 5% Build Quality
- 5% Breathability
- 5% Battery
- 4% Noise Isolation
- 3% Leakage
Score distribution:
The Sennheiser MM 450-X Wireless are compact on-ear headphones that sound surprisingly great. They reproduce vocals and instruments well and provide enough isolation for moderately loud environments. Unfortunately, the very small on-ear cups are uncomfortable and the headband does not feel sturdy or durable.
Test Results
| Design | 6.6 |
| Sound | 7.1 |
| Isolation | 7.2 |
| Active Features | 6.7 |
- Lightweight, compact design.
- Great audio reproduction.
- Uncomfortably small ear cups.
- Weak, flimsy build.
Check Price
MM 450-X
SEE PRICE
Amazon.com
Design
Score components:
- 28% Comfort
- 5% Controls
- 12% Stability
- 12% Portability
- 4% Case
- 29% Build Quality
- 10% Breathability
Score distribution:
The Sennheiser MM 450-X are compact but flimsy headphones. They are lightweight but uncomfortable and feel susceptible to breaking, especially at the joints. On the upside, the control options provided are relatively easy to use and efficient.
The MM 450X are small, flimsy-looking headphones. They are fragile, and their understated design is a little unexciting compared to other on-ear models. The black color scheme is given a bit more flare with silver highlights from the metal frame, the headband, and the Sennheiser branding. They do stick out a lot laterally when on the head, which conflicts with their compact, understated aesthetic.
6.0
Comfort
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
Score distribution:
Clamping Force
:
0.72 lbs
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.
The on-ear design of the MM 450-X is not comfortable for everyone. They are lightweight, flexible, and the earcups swivel, providing a little more comfort. However, the lack of padding on the headband and the ear cups feels a little uncomfortable and fatiguing after long listening sessions. The headband exerts a noticeable amount of tension on the head in an attempt to keep the headphones stable but also causes discomfort over time.
8.3
Controls
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.
Score components:
- 26% Ease of use
- 26% Feedback
- 16% Call/Music Control
- 16% Volume Control
- 11% Noise Canceling Control
- 5% Talk-Through
Score distribution:
Button layout and functionality is decent but cramped. The controls can be found on the right ear cup and include noise cancelling, Bluetooth, volume, call/music and track skipping. The cramped layout, however, is disappointing, as it becomes bothersome to use if you have larger fingers. The tactile feedback could also be improved.
7.0
Stability
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
Score distribution:
The MM 450-X are decently stable headphones. They stay in place during casual listening sessions. They're compact and lightweight, which prevents them from swaying too much during moderate physical activity. However, they're not designed for sports and will slip off your ears while running or doing high-intensity activities.
7.2
Portability
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:
- 20% Volume
- 80% Stand required
Score distribution:
The MM-450-X are more compact than typical on ear headphones. They are very portable and fold up into a smaller format to transport easily. They will comfortably fit in jacket pockets, purses and backpacks without taking too much space. They maybe a little too wide for regular pant pockets but they won't be too cumbersome to carry on your person.
6.5
Case
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
Score distribution:
6.0
Build Quality
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
Score distribution:
8.2
Breathability
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:
- 100% Avg.Temp.Difference
Score distribution:
Sound
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.)
Score components:
- 21% Bass
- 20% Mid
- 19% Treble
- 5% Frequency Response Consistency
- 21% Soundstage
- 5% Imaging
- 9% Total Harmonic Distortion
Score distribution:
7.3
Bass
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:
- 90% Std. Err.
- 10% Low-Frequency Extension
Score distribution:
Std. Err.
:
3.88 dB
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
Score distribution:
Low-Frequency Extension
:
28.49 Hz
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
Score distribution:
Low-Bass
:
-2.79 dB
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
Bass
:
2.72 dB
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
High-Bass
:
4.07 dB
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
7.6
Mid
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:
- 100% Std. Err.
Score distribution:
Std. Err.
:
3.15 dB
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
Score distribution:
Low-Mid
:
2.41 dB
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
Mid
:
0.89 dB
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
High-Mid
:
4.68 dB
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
5.3
Treble
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:
- 100% Std. Err.
Score distribution:
Std. Err.
:
5.7 dB
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
Score distribution:
Low-Treble
:
-0.65 dB
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
Treble
:
-2.84 dB
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
High-Treble
:
-7.36 dB
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
9.1
Total Harmonic Distortion
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:
- 50% Weighted THD @ 90
- 50% Weighted THD @ 100
Score distribution:
Weighted THD @ 90
:
0.032
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
Score distribution:
Weighted THD @ 100
:
0.599
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
Score distribution:
Isolation
The Sennheiser MM 450-X have moderately good noise isolation. The small on-ear cups provide a surprisingly decent seal that doesn't leak much sound and adds some passive isolation. Their active noise cancellation does a good enough job blocking the ambient noise of an office-like environment but might not be efficient enough to cancel the noise of an international flight.
6.7
Noise Isolation
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:
- 29% Bass
- 29% Mid
- 28% Treble
- 14% Self-Noise
Score distribution:
Overall Attenuation
:
-15.97 dB
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
Bass
:
-8.29 dB
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
Score distribution:
Mid
:
-10.55 dB
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
Score distribution:
Treble
:
-31.01 dB
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
Score distribution:
Self-Noise
:
13.95 dB
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
Score distribution:
Decent overall results. The passive isolation is quite impressive, considering these are on-ear headphones. The active cancellation is decent too, achieving average results in the bass and mid regions.
8.1
Leakage
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:
Score distribution:
Overall Leakage @ 1ft
:
33.13 dB
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
Score distribution:
Very good performance. These headphones leak little sound, as is expected from on-ear headphones.
Active Features
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:
- 30% Wireless
- 13% Latency
- 52% Battery
- 5% App Support
Score distribution:
The MM 450-x have a relatively short battery life at 7 hours of continuous play time, but they have a few power saving features that allow, them to last a bit longer when used casually. They also support aptX, which combined with their already pretty fast wireless connection, makes them latency-free when streaming audio and only slightly laggy watching videos. They also have a fairly decent wireless range. Unfortunately, they do not support Sennheiser's great downloadable app unlike the more recent models of the brand.
7.5
Wireless
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:
- 72% Obstructed Range
- 21% Line of Sight Range
- 7% NFC
Score distribution:
Type
:
Bluetooth 2.1+EDR
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.
Obstructed Range
:
41 ft
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 or more
Noticeable difference:
5ft
Score distribution:
Line of Sight Range
:
96 ft
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
Score distribution:
NFC
:
No
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.
The Sennheiser MM 450-X have a decent line-sight range but deliver a surprisingly stable connection up to 40ft when the Bluetooth source was placed in another room. This makes them good wireless headphones to walk around your house or a moderately sized office without necessarily carrying your Bluetooth source on you. They won't be the farthest reaching outdoors in direct line of sight but this is not a significant issue for most listeners. Unfortunately, their hold to pair procedure and lack of NFC makes them a little tedious to switch between devices.
Base Latency
:
121 ms
What it is:
The latency for the default sub-band coding 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:
75ms or less
Noticeable difference:
15ms
Score distribution:
aptX Latency
:
97 ms
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:
130ms or less
Noticeable difference:
15ms
Score distribution:
aptX(LL) Latency
:
N/A
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
Score distribution:
7.0
Battery
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:
- 60% Battery Life
- 25% Charge Time
- 10% Auto-off
- 5% Audio while charging
Score distribution:
Battery Type
:
Rechargable
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.
Battery Life
:
7 hrs
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
Score distribution:
Charge Time
:
2.2 hrs
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
Score distribution:
Auto-off
:
Yes
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.
Audio while charging
:
Yes
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.
Passive Playback
:
No
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.
The MM 450-x have better battery life than the MM 550-x but take a bit longer to charge. They won't be the best headphones to take on long road trips or lengthy flights, but you get about 7 hours of use when all the features are enabled and at regular volumes. Unfortunately, their auto-off feature is a bit slow at 60 minutes so don't forget to turn them off to save power.
0
App Support
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
Score distribution:
No compatible app.
In the box
- Sennheiser MM 450-X Headphones
- Audio cable
- Carrying case
- USB cable
- (EU) power adapter
- (UK) power adapter
- (AU) power adapter
- (US) power adapter
- Airline Adapter
- 1/8" to 1/4" Adapter
- Manual
Conclusion
SEE PRICE
Amazon.com
The MM 450-X are compact noise cancelling headphones ideally for traveling and commuting. Sadly, lacking a strong isolation performance they are best used as everyday casual headphones.
Average-at-best for critical listening. They have a decent sound but a poor soundstage. They won't reproduce high-res audio with the clarity and detail of an open back design.
Mediocre for commuting. They're compact and easy to carry around but don't block much noise.
Not ideal for sports, They're lightweight compact and wireless. However, they're a little unstable for high-intensity exercises.
Decent for office use. They will only reduce a little bit of office chatter but on the upside, they don't leak much.
Average for home theater use. They have a better sound than the MM 550X, and a r3elatively low latency performance with aptX enabled. however, they will still have a noticeable delay, and they're not the most comfortable headphones to wear for long movies.
