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What we think
The PerfectRec Earbuds or Headphones team Learn more
Updated January 10, 2024·
If price is a major concern, the Sony WH-CH520 may be more appealing as it is less expensive than the 7hz Timeless. However, the 7hz Timeless often provides superior sound quality favored by audiophiles and those seeking a more detailed listening experience, which justifies its higher price tag. The Sony WH-CH520 could be more convenient for casual use, as it may offer features like wireless connectivity, which is great for on-the-go listening without worrying about cables, while the 7hz Timeless is typically wired, which can limit mobility but often results in a more stable audio connection. Consider how you will be using the earbuds or headphones—7hz Timeless for critical listening and Sony WH-CH520 for everyday, versatile use. 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 Sony WH-CH520
- Very good for gaming
- Very good for TV and video
- Very good for air travel
- Very good for podcasts and audiobooks
Key differences
Music
8.6
7.6
The 7hz Timeless is very good for music, while the Sony WH-CH520 is good.
Gaming
6.6
8.8
The Sony WH-CH520 is very good for gaming, while the 7hz Timeless is only fair.
Phone Calls
4.3
6.7
The Sony WH-CH520 is only fair for phone calls, while the 7hz Timeless is poor.
Podcasts and Audiobooks
6.8
8.0
The Sony WH-CH520 is very good for podcasts and audiobooks, while the 7hz Timeless is only fair.
Noise Reduction
5.3
4.6
The 7hz Timeless and Sony WH-CH520 are both poor for noise reduction, though the 7hz Timeless is somewhat better.
Battery
N/A
52.0 Hours
The 7hz Timeless does not have a battery. The Sony WH-CH520 has 52 hours of battery life.
Cost
$200
$40
$0
$50
$100
$150
$200
$250
$300
The 7hz Timeless has a price of $200 and the Sony WH-CH520 costs $40.
Build Quality
8.5
7.0
The 7hz Timeless has very good build quality, while the Sony WH-CH520 has good build quality.
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Key similarities
TV and Video
7.8
8.2
Although they have very similar scores, PerfectRec considers Sony WH-CH520 to be very good for TV and video, while the 7hz Timeless is good.
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How the 7hz Timeless and the Sony WH-CH520 compare to other earbuds and headphones
Spec Comparison
 |  | |
| 7hz Timeless | Sony WH-CH520 |
GENERAL | |||
|---|---|---|---|
| Price | |||
$200 | $40 | ||
Brand | |||
Brand | 7hz | Sony | |
Release Date | |||
Release Date | August 1, 2021 | April 1, 2023 | |
Form Factor | |||
Form Factor | Earbuds | Headphones | |
Connectivity | |||
Connectivity | Wired | Wireless | |
SOUND | |||
|---|---|---|---|
Music Score | |||
Music Score | 8.6/10 | 7.7/10 | |
Phone Calls Score | |||
Phone Calls Score | 4.3/10 | 6.8/10 | |
Gaming Score | |||
Gaming Score | 6.7/10 | 8.8/10 | |
TV and Video Score | |||
TV and Video Score | 7.8/10 | 8.2/10 | |
Exercise Score | |||
Exercise Score | 4.3/10 | 6.4/10 | |
PERFORMANCE | |||
|---|---|---|---|
Battery life | |||
Battery life | N/A | 52 Hours | |
Wireless charging | |||
Wireless charging | N/A | No | |
Charging time | |||
Charging time | N/A | 1.9 Hours | |
Bluetooth version | |||
Bluetooth version | N/A | 5.2 | |
FEATURES | |||
|---|---|---|---|
Active Noise Cancelling | |||
Active Noise Cancelling | No | No | |
Noise Reduction Score | |||
Noise Reduction Score | 5.3/10 | 4.6/10 | |
Virtual Surround | |||
Virtual Surround | N/A | Yes | |
Android App | |||
Android App | N/A | Yes | |
iOS App | |||
iOS App | N/A | Yes | |
Mic Quality | |||
Mic Quality | N/A | 8/10 | |
BUILD AND DESIGN | |||
|---|---|---|---|
Build Quality | |||
Build Quality | 8.5/10 | 7/10 | |
Comfort score | |||
Comfort score | 7/10 | 10/10 | |
Size | |||
Size | Large | N/A | |
Weight (headset or single earbud) | |||
Weight (headset or single earbud) | 5.5 Grams | 147.41 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."
Sony WH-CH520
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Sound Guys
Christian Thomas | September 2023
"If you’re looking for headphones that simply do what you ask them to: the Sony WH-CH520 is a decent option, even if it isn’t very exciting. Sony’s WH-CHXXX line fits this role quite well, and the WH-CH520 offers a decent raft of quality-of-life updates over its predecessor that should keep listeners happy. If the Sony WH-CH520 were a car, it’d be the boring-but-safe commuter compact."
Get a great deal on the 7hz Timeless or the Sony WH-CH520
About Sony
Sony is a multinational corporation, based out of Japan, with over 75 years of experience in the consumer electronics industry. In the audio market, Sony has been a trendsetter several times throughout its history. In 1979 they released the first-ever portable music player, the Sony Walkman, followed by the Discman 20 years later. Today, Sony is one of the leaders in the wireless headphone and earbud market, especially in terms of Active Noise Cancellation technology.
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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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