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What we think
The PerfectRec Earbuds or Headphones team Learn more
Updated January 10, 2024·
If you prioritize sound quality and are willing to invest, consider the 7hz Timeless, as they often provide better audio fidelity due to planar magnetic drivers, which are known for their precision and detail. However, if you’re looking for wireless convenience and longer battery life, the Sennheiser HD 350BT headphones are a solid choice, especially as they cost less. The Sennheisers also have an integrated microphone, which the 7hz Timeless may lack, making them more practical for hands-free calls. For active lifestyles or travel, wireless headphones like the HD 350BT can be more user-friendly. 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 7hz Timeless
- 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
8.6
7.0
The 7hz Timeless is very good for music, while the Sennheiser HD 350BT is good.
Gaming
6.6
9.1
The Sennheiser HD 350BT is excellent for gaming, while the 7hz Timeless is only fair.
Phone Calls
4.3
7.4
The Sennheiser HD 350BT is good for phone calls, while the 7hz Timeless is poor.
Podcasts and Audiobooks
6.8
8.3
The Sennheiser HD 350BT is very good for podcasts and audiobooks, while the 7hz Timeless is only fair.
TV and Video
7.8
9.0
The Sennheiser HD 350BT is excellent for TV and video, while the 7hz Timeless is good.
Noise Reduction
5.3
6.0
The Sennheiser HD 350BT is only fair for noise reduction, while the 7hz Timeless is poor.
Battery
N/A
33.0 Hours
The 7hz Timeless does not have a battery. The Sennheiser HD 350BT has 33 hours of battery life.
Cost
$200
$80
$50
$100
$150
$200
$250
$300
The 7hz Timeless has a price of $200 and the Sennheiser HD 350BT costs $80.
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Key similarities
Build Quality
8.5
8.2
The 7hz Timeless and Sennheiser HD 350BT both have very good build quality.
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How the 7hz Timeless and the Sennheiser HD 350BT compare to other earbuds and headphones
Spec Comparison
 |  | |
| 7hz Timeless | Sennheiser HD 350BT |
GENERAL | |||
|---|---|---|---|
| Price | |||
$200 | $80 | ||
Brand | |||
Brand | 7hz | Sennheiser | |
Release Date | |||
Release Date | August 1, 2021 | January 1, 2020 | |
Form Factor | |||
Form Factor | Earbuds | Headphones | |
Connectivity | |||
Connectivity | Wired | Wireless | |
SOUND | |||
|---|---|---|---|
Music Score | |||
Music Score | 8.6/10 | 7/10 | |
Phone Calls Score | |||
Phone Calls Score | 4.3/10 | 7.4/10 | |
Gaming Score | |||
Gaming Score | 6.7/10 | 9.1/10 | |
TV and Video Score | |||
TV and Video Score | 7.8/10 | 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 | N/A | 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 | 8.5/10 | 8.2/10 | |
Comfort score | |||
Comfort score | 7/10 | 7.6/10 | |
Size | |||
Size | Large | N/A | |
Weight (headset or single earbud) | |||
Weight (headset or single earbud) | 5.5 Grams | 238 Grams | |
Microphone style | |||
Microphone style | N/A | Integrated | |
Shopping
7hz Timeless
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Headphonesty
Kazi Mahbub Mutakabbir | May 2023
"7Hz picked a bold name for the Timeless and frankly, got very close to justifying their word choice. Most importantly, the Timeless are good to go in stock form, so you don’t have to worry about source-matching and such. I can recommend the 7Hz Timeless to those who do not mind a dash of brightness up top, want a taste of planar in IEM form, and want one of the most resolving pair of earphones in the $150 - $300 price range."
Sennheiser HD 350BT
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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 7hz Timeless or the Sennheiser HD 350BT
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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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
Joe Golden, Ph.D
CEO and Earbuds and Headphones Editor
Joe is an entrepreneur and lifelong electronics enthusiast with a Ph.D in Economics from the University of Michigan.
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Chandradeep is a staff expert and software engineer and expert in televisions and monitors. He’s been making monitor recommendations for ten years.
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