The Sennheiser HD1 In-Ear are average mixed usage wired in-ears, with a portable design. They have a great case and easily fit into your pockets. They're stable, and they don't leak, so you won't distract anyone around you. However, their sound quality is not the best for more critical listeners, and the in-ear fit can be uncomfortable for some.
The Sennheiser HD1 In-Ear feel high-end and durable but look a bit bland. They have the typical in-ear design and fit, so they may not be the most comfortable headphones for everyone. Thankfully, the cables are decently rubberized, and the earbud tips are flexible enough to deliver a stable fit that's good for jogging or running. They're lightweight, super portable, and come with a great case that will prevent them from getting damaged.
The Sennheiser Momentum In-Ear have a stylish red and black color scheme but do not really stand out design-wise, compared to other in-ear headphones. They have relatively small earbuds that do not protrude outwards when in your ears. And the rubberized cables are slightly flat, which gives them a more well-crafted and somewhat premium appeal. However, they still look a bit bland.
The Sennheiser HD1 In-Ear have the typical in-ear fit, which may not be comfortable for everyone. They come with several tip sizes but no foam or special tips to help with a better fit. On the upside, the tip material is quite flexible, and if you're used to in-ear models, these headphones shouldn't feel too different.
The buttons on the in-line remote provide good tactile feedback and are fairly easy to use. They offer call/music, track skipping, and volume control but they're a bit small. However, they're sufficiently well spaced out and shouldn't be too difficult to use in most situations.
The Sennheiser HD1 In-Ear, like most in-ear/earbud designs, are very breathable headphones. They trap a bit of heat within your ear canal but won't make you sweat more than usual since they do not cover your outer ear. It's a negligible temperature difference even during more intense exercises, which makes them a decent option for sports.
Like most in-ear models, these headphones are highly portable. They will easily fit into bags and thanks to the added cable winder, they're easy to manage and safely store in your pockets. If you're often out and about and need to carry your headphones on your person, the Momentum In-Ear shouldn't be much of a hassle, and they also come with an excellent case.
These headphones come with a sturdy, fabric covered hard case that's reinforced by the plastic cable winder. This also helps to neatly store the headphones within the case, which will easily protect the headphones from physical and minor water damage as well as regular wear and tear.
The Sennheiser HD1 In-Ear feel moderately durable. The cables are decently thick and rubberized, and they're slightly flat to prevent them from getting tangled easily. The in-line control module is also well put together and feels relatively dense. However, where the audio cables connect to the ear buds isn't strengthened by any additional rubber to prevent regular wear and tear. They also do not detach from the ear buds like some of the more expensive in-ear models. This means if they're accidentally damaged the cables will not be replaceable.
These headphones are quite stable. The in-ear fit buries the ear buds relatively deep within the ear canal. The tips are also very flexible, so they fill and conform to the shape of your ear canal pretty well so that they're not easily dislodged during casual listening sessions. They're sufficiently stable to jog with, but the lack of stability tips means a sharp tug on the audio cable will quickly pull the ear buds out of your ears. They're decent for sports but might not be the best under strenuous exercise conditions.
The Sennheiser HD1 In-Ear are mediocre sounding closed-back in-ear headphones. They have a deep, powerful, and consistent bass, and well-balanced mid-range, and an even treble. However, their upper bass and lower mid regions sound a bit boomy and cluttered, making vocals a bit thick sounding. Also, their treble lacks a bit of detail and presence and could sound a bit sharp and piercing on S and T sounds. Also, like most other headphones, especially in-ears, they don't have a large and speaker-like soundstage.
The Sennheiser Momentum In-Ear have a very good bass. LFE (low-frequency extension) is at 10Hz, which is excellent. Low-bass, responsible for the thump and rumble common to bass-heavy music at within 1dB of our neutral target, meaning they produce just the right amount of sub-bass. However, mid-bass, responsible for the body of bass guitars and the punch of kick drums is hyped by 2.5dB. Also, high-bass, responsible for warmth is overemphasized by more than 5dB, which makes the overall sound of these headphones rather boomy and muddy.
The mid-range performance is very good. The bump in low-mid is actually the continuation of the high-bass overemphasis. This makes the vocals and lead instruments slightly thick, and makes the overall mix a bit cluttered. The underemphasis in mid-mid and high-mid means the mid-range of the HD1 In-Ear sounds a bit recessed, that is, the vocals and lead instruments are nudged towards the back of the mix.
The treble range performance is mediocre. The broad 5dB dip in low-treble negatively affects the detail and presence of vocals and lead instruments. On the other hand, the peaks at 7KHz and 10KHz make the vocals and cymbals a bit sibilant. That is, sharp and piercing on S and T sounds.
The frequency response consistency of the Sennheiser HD1 In-Ear is excellent. Assuming the user is able to achieve a proper fit and an air-tight seal using the assortment of tips that come with the headphones, they should be able to get consistent bass and treble delivery every time they use the headphones.
The imaging performance of the HD1 In-Ear is excellent. Their weighted group delay is 0.11, which is very low. The GD graph also shows that the group delay never crosses the audibility threshold. This ensures a tight bass and a transparent treble reproduction. Additionally, the L/R drivers of our test unit were exceptionally well-matched, which is important for the accurate placement and localization of objects (instruments, voice, footsteps), in the stereo image.
Like most other in-ears, the soundstage of the Sennheiser Momentum In-Ear is poor. This is because in-ears bypass the pinna (outer ear), and don't interact with it, while activating the resonances of the pinna is one of the key factors in creating a speaker-like and out-of-head soundstage. Also, because of their closed-back design, their soundstage tends to be less open than that of open-back headphones.
The harmonic distortion performance of the HD1 In-Ear is excellent. The overall amount of THD is very low, especially in the bass range. Also, for the most of the spectrum, the 100dB SPL pass shows less harmonic distortion than the 90dB SPL pass. This is most likely due to the increased flexibility of the driver under heavier loads. However, the spike around 1.2KHz could make the sound of the region a bit of harsh and impure.
The Sennheiser HD1 In-Ear have a passive seal that prevents a significant amount of noise from seeping into your audio. They're not quite as good as some of the noise canceling models, but at decently high volumes you shouldn't be distracted by the hustle and bustle of a regular commute. They also barely leak so you can play your music at those higher volumes and not worry about being heard by the people around you.
Decent isolation. Although these in-ears isolate only passively, their tight fit creates an impressive degree of isolation for a passive device. In the bass range, where the rumble of airplane and bus engines sits, they isolate by about 6dB, which is inadequate. The weak point with these headphones seem to the 200Hz range. However, in the mid-range, important for blocking out speech, they achieved more than 19dB of isolation, which is quite good. In the treble range, occupied by sharp sounds like S and Ts, they isolate by more than 45dB, which is excellent.
Excellent leakage performance. The closed-back and tight fit of these in-ears don't let much sound out of them. The significant portion of their leakage is between 1KHz and 8KHz, which is broad, but the overall level of the leakage is so low that makes the other variable rather irrelevant. With the music at 100dB SPL, the leakage at 1 foot away averages at about 25dB SPL while peaking at 33dB SPL, which is way below the noise floor of an average office.
The in-line microphone of the Sennheiser HD1 In-Ear has an average performance. In quiet environments, speech recorded or transmitted with this mic sounds noticeably thin and lacking a bit of detail and presence. However, it will be open, airy, and intelligible. In noisy situations, this microphone won't be able to fully separate speech from background noise even in moderately loud places, like a busy street.
The microphone of the HD1 In-Ear has a decent recording quality. The LFE (low-frequency extension) is at 480Hz, indicating the speech recorded/transmitted with this mic will sound noticeably thin. The HFE (high-frequency extension) of 19.7KHz is very good and results in a open and airy transmission. However, the dip surrounding 5KHz negatively affects the detail and presence of speech. It'll still be quite intelligible though, since speech intelligibility is mostly dependent on the 500Hz-4KHz range.
The noise handling of the microphone is mediocre. In our SpNR test, it achieved a speech-to-noise ratio of 12dB. This means they are best suited for quiet environments as they won't be able to fully separate speech from ambient noise even in moderately loud places.
The Sennheiser HD1 In-Ear have no active components and therefore do not require a battery. They also have no app support for added customization options.
The Sennheiser Momentum In-Ear are passive in-ears with no active components that need power so they do not have a battery.
These headphones do not have any app support.
The Sennheiser Momentum In-Ear are passive, wired headphones, that only connect to other devices via their 1/8" TRRS audio cable. On the upside, the non-detachable iOS-specific audio cable has no latency, and the inline mic is only compatible with the PS4 controller and PCs with the right jack or headset adapter but not with the Xbox One. Unfortunately, since they are wired, they will not have the convenient range of wireless headphones.
The Sennheiser HD1 In-Ear have a 1/8'TRRS audio cable with an inline remote microphone that's compatible with the PS4 and PCs if you have a headset adapter or a 3-pin audio jack like on most tablets, laptops and phones. Unfortunately, since it is an iOS-specific cable it will not have full functionality on Android phones and will not have mic support with the Xbox One controller.
The HD1 in-ears do not have a dock. If you need a headset with a dock that also has a wired connection for gaming or watching movies, then consider the SteelSeries Arctis 7.
The Sennheiser Momentum In-Ear headphones are wired and do not have a wireless range.
Like most wired headsets, the HD1 in-ear have negligible latency. They are a suitable option for gaming and watching movies, but they are limited by the relatively short range of their audio cable.
The Sennheiser HD1 In-Ear do not have the best sound quality for critical listening. But on the upside, they block enough noise to be a suitable option for commuting and they will easily fit into your pockets so you can have them on you at all times. They're also sufficiently stable for sports and working out although they won't be as good as some of the competing in-ear models below.
The 1More Triple Driver in-ear are a slightly better headphone than the Sennheiser HD1 In-Ear. The 1Mores have a more durable build quality than the Sennheisers. They also come with more tip sizes, so they will fit better and more comfortably than the HD1 In-Ear. The 1Mores also have a better sound and a universal in-line remote that will work with most devices unlike the HD1's OS specific audio cable. On the upside, the HD1 have slightly better isolation and a unique look that some may prefer over the Triple Drivers.
The Sennheiser Momentum In-Ear are a slightly better and more versatile headphone than the Shure SE215. The Shures have a better sound quality overall, and they're more comfortable thanks to the angled earbuds. They also have a much more durable build quality than the HD1 In-Ear. However, the HD1 In-Ear have an in-line remote, which provides control for iOS devices and has a microphone for taking calls, making them more versatile for everyday casual use. They also come with a better case than the Shures and have a slightly more compact design.
The Bose SoundTrue Ultra In-Ear are better, wired headphones than the Sennheiser HD1 In-Ear. The Bose have a more comfortable earbud design that most will prefer over the fit of the HD1. The Bose also have a better-balanced sound and a more stable design for sports. On the other hand, the HD1 in-ear have a bit more isolation in loud, noisy environments although not by much. They also have an easier to use in-line remote than the Bose.
The Jaybird X3 are a better option than the Sennheiser HD1 in-ear if you want to go wireless. The X3 has better build quality, a more balanced sound that you can EQ thanks to their companion app, and they have a better range since they are wireless. However, the HD1 do better for watching movies since their wired design has no latency. They also have not battery life since they are completely passive so they will always work as long as you have a headphone jack.
The Sennheiser Momentum In-Ear are a slightly better and more versatile option than the KZ ZS-10 with no mic. The KZ have a better sound quality, they're more comfortable and they're a lot more durable thanks to the good build quality and replaceable cable. The HD1 In-Ear however, have an in-line remote, which provides control for iOS devices and has a microphone for taking calls, making them more versatile for everyday casual use. They also come with a case, have a slightly more compact design than the KZ ZS10. On the upside, if you get the mic variant of the KZ, they would be the better headset overall.