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What we think
The PerfectRec Earbuds or Headphones team Learn more
Updated January 10, 2024·
If you're looking for exceptional music quality and are willing to invest more, the 7hz Timeless earbuds with their planar drivers offer superior sound quality for music listening over the Sennheiser HD 400S. However, consider the Sennheiser HD 400S headphones if you're seeking comfort, good call quality, and a budget-friendly option. They are also better suited for gaming due to lower latency and a built-in microphone. Both have closed-back designs and similar noise isolation, but if portability and exercising are priorities, neither may be ideal, though the Sennheisers are foldable for easier transport. Neither option supports wireless connectivity or active noise cancelling. 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 400S
- Very good for phone calls
- Very good for gaming
- Good for air travel
- Good for podcasts and audiobooks
Key differences
Music
8.6
7.1
The 7hz Timeless is very good for music, while the Sennheiser HD 400S is good.
Gaming
6.6
8.6
The Sennheiser HD 400S is very good for gaming, while the 7hz Timeless is only fair.
Phone Calls
4.3
8.2
The Sennheiser HD 400S is very good for phone calls, while the 7hz Timeless is poor.
Podcasts and Audiobooks
6.8
7.6
The Sennheiser HD 400S is good for podcasts and audiobooks, while the 7hz Timeless is only fair.
Cost
$185
$61
$50
$100
$150
$200
$250
$300
The 7hz Timeless has a price of $185 and the Sennheiser HD 400S costs $61.
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Key similarities
TV and Video
7.8
7.6
The 7hz Timeless and Sennheiser HD 400S are both good for TV and video.
Noise Reduction
5.3
5.3
The 7hz Timeless and Sennheiser HD 400S are both poor for noise reduction.
Build Quality
8.5
8.5
The 7hz Timeless and Sennheiser HD 400S both have very good build quality.
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How the 7hz Timeless and the Sennheiser HD 400S compare to other earbuds and headphones
Spec Comparison
 |  | |
| 7hz Timeless | Sennheiser HD 400S |
GENERAL | |||
|---|---|---|---|
| Price | |||
$185 | $61 | ||
Brand | |||
Brand | 7hz | Sennheiser | |
Release Date | |||
Release Date | August 1, 2021 | January 1, 2019 | |
Form Factor | |||
Form Factor | Earbuds | Headphones | |
Connectivity | |||
Connectivity | Wired | Wired | |
SOUND | |||
|---|---|---|---|
Music Score | |||
Music Score | 8.6/10 | 7.2/10 | |
Phone Calls Score | |||
Phone Calls Score | 4.3/10 | 8.2/10 | |
Gaming Score | |||
Gaming Score | 6.7/10 | 8.7/10 | |
TV and Video Score | |||
TV and Video Score | 7.8/10 | 7.7/10 | |
Exercise Score | |||
Exercise Score | 4.3/10 | 4.2/10 | |
FEATURES | |||
|---|---|---|---|
Active Noise Cancelling | |||
Active Noise Cancelling | No | No | |
Noise Reduction Score | |||
Noise Reduction Score | 5.3/10 | 5.3/10 | |
Virtual Surround | |||
Virtual Surround | N/A | No | |
Mic Quality | |||
Mic Quality | N/A | 8.5/10 | |
BUILD AND DESIGN | |||
|---|---|---|---|
Build Quality | |||
Build Quality | 8.5/10 | 8.5/10 | |
Comfort score | |||
Comfort score | 7/10 | 8.4/10 | |
Size | |||
Size | Large | N/A | |
Weight (headset or single earbud) | |||
Weight (headset or single earbud) | 5.5 Grams | 213 Grams | |
Microphone style | |||
Microphone style | N/A | Integrated | |
Shopping
7hz Timeless
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Dig into reviews and images
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 400S
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Headphone Dungeon
Jim | August 2022
"Sennheiser has done it again. The HD 400S performs well beyond its price range and is one of the better budget model headphones I’ve tried. It has very few bells and whistles and offers a simple means of listening that still delivers amazing clarity and quality. If you need a good first pair of headphones or need something that you can take out of the house, then the HD 400S is definitely for you."
Get a great deal on the 7hz Timeless or the Sennheiser HD 400S
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
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.
Jason Lew
Staff Expert & Software Engineer
Jason is a staff expert and software engineer that has been making laptop recommendations for 7 years and moderates one of the largest laptop subreddits.
Chandradeep Chowdhury
Staff Expert & Software Engineer
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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Earbuds and Headphones Expert
Luis is a Mexico-based headphones expert. He’s been making headphone recommendations for five years and has close to 100 pairs in his personal collection.
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