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What we think
The PerfectRec Earbuds or Headphones team Learn more
Updated January 10, 2024·
The Audio Technica ATH M40X delivers superior sound quality and is excellent for critical listening; they’re wired, have a detachable cable, and are good for TV and video, but they lack a microphone for calls. In contrast, the Sennheiser HD 350BT is wireless with a noticeable advantage in call quality and battery life, supports low latency codecs for better sync during videos and gaming, and offers an app for customization. If you prioritize a wireless experience and plan to use them for calls and on-the-go, the HD 350BT could be the better choice, but for focused listening sessions with the highest sound fidelity, the ATH M40X would be preferable. Give Feedback
this description is based on the product variant with some specs and product variant with some specs. At the time of writing, the variant with some specs cost some dollars and the variant with some specs cost some dollars.
Advantages of the Audio Technica ATH M40X
- Very good for music
Advantages of the Sennheiser HD 350BT
- Good for phone calls
- Excellent for gaming
- Excellent for TV and video
- Very good for air travel
- Very good for podcasts and audiobooks
Key differences
Music
8.1
7.0
The Audio Technica ATH M40X is very good for music, while the Sennheiser HD 350BT is good.
Gaming
7.0
9.1
The Sennheiser HD 350BT is excellent for gaming, while the Audio Technica ATH M40X is good.
Phone Calls
3.3
7.4
The Sennheiser HD 350BT is good for phone calls, while the Audio Technica ATH M40X is poor.
Podcasts and Audiobooks
5.1
8.3
The Sennheiser HD 350BT is very good for podcasts and audiobooks, while the Audio Technica ATH M40X is poor.
Noise Reduction
5.3
6.0
The Sennheiser HD 350BT is only fair for noise reduction, while the Audio Technica ATH M40X is poor.
Battery
N/A
33.0 Hours
The Audio Technica ATH M40X does not have a battery. The Sennheiser HD 350BT has 33 hours of battery life.
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Key similarities
TV and Video
8.7
9.0
Although they have very similar scores, PerfectRec considers Sennheiser HD 350BT to be excellent for TV and video, while the Audio Technica ATH M40X is very good.
Cost
$79
$80
$50
$60
$70
$80
$90
$100
The Audio Technica ATH M40X has a price of $79 and the Sennheiser HD 350BT costs $80.
Build Quality
8.2
8.2
The Audio Technica ATH M40X and Sennheiser HD 350BT both have very good build quality.
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How the Audio Technica ATH M40X and the Sennheiser HD 350BT compare to other earbuds and headphones
Spec Comparison
 |  | |
| Audio Technica ATH M40X | Sennheiser HD 350BT |
GENERAL | |||
|---|---|---|---|
| Price | |||
$79 | $80 | ||
Brand | |||
Brand | Audio Technica | Sennheiser | |
Release Date | |||
Release Date | January 1, 2014 | January 1, 2020 | |
Form Factor | |||
Form Factor | Headphones | Headphones | |
Connectivity | |||
Connectivity | Wired | Wireless | |
SOUND | |||
|---|---|---|---|
Music Score | |||
Music Score | 8.1/10 | 7/10 | |
Phone Calls Score | |||
Phone Calls Score | 3.3/10 | 7.4/10 | |
Gaming Score | |||
Gaming Score | 7.1/10 | 9.1/10 | |
TV and Video Score | |||
TV and Video Score | 8.8/10 | 9.1/10 | |
Exercise Score | |||
Exercise Score | 4.3/10 | 6.3/10 | |
PERFORMANCE | |||
|---|---|---|---|
Battery life | |||
Battery life | N/A | 33 Hours | |
Wireless charging | |||
Wireless charging | N/A | No | |
Charging time | |||
Charging time | N/A | 2 Hours | |
Bluetooth version | |||
Bluetooth version | N/A | 5 | |
FEATURES | |||
|---|---|---|---|
Active Noise Cancelling | |||
Active Noise Cancelling | No | No | |
Noise Reduction Score | |||
Noise Reduction Score | 5.3/10 | 6/10 | |
Virtual Surround | |||
Virtual Surround | No | No | |
Android App | |||
Android App | N/A | Yes | |
iOS App | |||
iOS App | N/A | Yes | |
Mic Quality | |||
Mic Quality | N/A | 8.5/10 | |
BUILD AND DESIGN | |||
|---|---|---|---|
Build Quality | |||
Build Quality | 8.2/10 | 8.2/10 | |
Comfort score | |||
Comfort score | 7.6/10 | 7.6/10 | |
Weight (headset or single earbud) | |||
Weight (headset or single earbud) | 245 Grams | 238 Grams | |
Microphone style | |||
Microphone style | N/A | Integrated | |
Waterproof Rating | |||
Waterproof Rating | 0 | 0 | |
Shopping
Audio Technica ATH M40X
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Dig into reviews and images
Soundguys
Lily Katz | August 2023
"If you were to pick one headset to fill all of your needs, the ATH-M40x is a great buy with its sub-$100 price tag, pleasant sound quality, and accessories. Whether you need to use it for live monitoring, a midnight editing session, or to underscore a campus walk, the Audio-Technica ATH-M40x is a great companion."
Sennheiser HD 350BT
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Dig into reviews and images
Soundguys
Lily Katz | September 2023
"Sennheiser nails just nearly everything about the Sennheiser HD 350BT headphones. Sound quality is excellent, and the high-quality Bluetooth codec support is a rarity at this price point. If you don’t care for high-tech features like automatic ear detection, you’ll be delighted with these portable headphones."
Get a great deal on the Audio Technica ATH M40X or the Sennheiser HD 350BT
About Audio Technica
Audio Technica is a 60-year-old, Japan-based, professional audio equipment manufacturer. They started off making phonograph cartridges and have expanded their scope of products ever since to include extremely popular models of microphones and headphones. They have been the official audio equipment supplier of several editions of the Summer and Winter Olympics and every edition of the Grammy Awards since 1998.
About Sennheiser
A family-owned company, Sennheiser is a German, high fidelity, audio equipment manufacturer founded in 1945. Their consumer audio division is now owned by the Swiss hearing aid and cochlear implant manufacturer Sonova. Sennheiser offers a wide variety of, very high quality, audio equipment solutions, from headphones to earbuds, full sets of monitoring speakers, amplifiers and microphones. They also make what is widely regarded as the best, and most expensive, headphones in existence, the HE-1 Orpheus, costing a whopping $59,000 dollars.
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Why trust us
This information was produced and vetted by the PerfectRec earbuds & headphones team. We are a product research and recommendation organization that meticulously reviews and evaluates the latest earbuds or headphones information and makes it digestible for you.
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About the Earbuds or Headphones team
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Joe is an entrepreneur and lifelong electronics enthusiast with a Ph.D in Economics from the University of Michigan.
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