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What we think
The PerfectRec Earbuds or Headphones team Learn more
Updated April 11, 2024·
If you're on a budget and don't mind wired earbuds, the KZ ZSN Pro X offers good sound quality and is compatible with high-quality cables for enhanced audio. However, if you're looking for wireless convenience, superior comfort, effective noise cancellation for travel, and better call quality, the Sennheiser 450BT may justify the extra expense. The Sennheiser also supports low latency listening which is great for TV and video, and has a longer battery life. The KZ ZSN Pro X could be suitable for casual music listening and is portable, but it lacks features like active noise cancelling and isn't optimized for extended use during exercise or calls. 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 KZ ZSN Pro X
- Good for music
Advantages of the Sennheiser 450BT
- Very good for gaming
- Very good for TV and video
- Excellent for air travel
- Good for podcasts and audiobooks
Key differences
Music
7.0
6.2
The KZ ZSN Pro X is good for music, while the Sennheiser 450BT is only fair.
Gaming
5.9
8.8
The Sennheiser 450BT is very good for gaming, while the KZ ZSN Pro X is poor.
Phone Calls
3.1
6.9
The Sennheiser 450BT is only fair for phone calls, while the KZ ZSN Pro X is poor.
Podcasts and Audiobooks
4.7
7.9
The Sennheiser 450BT is good for podcasts and audiobooks, while the KZ ZSN Pro X is poor.
TV and Video
7.3
8.1
The Sennheiser 450BT is very good for TV and video, while the KZ ZSN Pro X is good.
Noise Reduction
6.0
9.1
The Sennheiser 450BT is excellent for noise reduction, while the KZ ZSN Pro X is only fair.
Battery
N/A
27.5 Hours
The KZ ZSN Pro X does not have a battery. The Sennheiser 450BT has 27.5 hours of battery life.
Cost
$24
$90
$0
$50
$100
$150
$200
The KZ ZSN Pro X has a price of $24 and the Sennheiser 450BT costs $90.
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Key similarities
Build Quality
8.5
8.0
The KZ ZSN Pro X and Sennheiser 450BT both have very good build quality.
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How the KZ ZSN Pro X and the Sennheiser 450BT compare to other earbuds and headphones
Spec Comparison
 |  | |
| KZ ZSN Pro X | Sennheiser 450BT |
GENERAL | |||
|---|---|---|---|
| Price | |||
$24 | $90 | ||
Brand | |||
Brand | KZ | Sennheiser | |
Release Date | |||
Release Date | June 1, 2020 | February 1, 2020 | |
Form Factor | |||
Form Factor | Earbuds | Headphones | |
Connectivity | |||
Connectivity | Wired | Wired + Wireless | |
SOUND | |||
|---|---|---|---|
Music Score | |||
Music Score | 7/10 | 6.2/10 | |
Phone Calls Score | |||
Phone Calls Score | 3.1/10 | 7/10 | |
Gaming Score | |||
Gaming Score | 6/10 | 8.9/10 | |
TV and Video Score | |||
TV and Video Score | 7.3/10 | 8.1/10 | |
Exercise Score | |||
Exercise Score | 4.2/10 | 6.1/10 | |
PERFORMANCE | |||
|---|---|---|---|
Battery life | |||
Battery life | N/A | 27.5 Hours | |
Wireless charging | |||
Wireless charging | N/A | No | |
Charging time | |||
Charging time | N/A | 2.3 Hours | |
Bluetooth version | |||
Bluetooth version | N/A | 5 | |
FEATURES | |||
|---|---|---|---|
Active Noise Cancelling | |||
Active Noise Cancelling | No | Yes | |
Noise Reduction Score | |||
Noise Reduction Score | 6/10 | 9.1/10 | |
Virtual Surround | |||
Virtual Surround | No | No | |
Android App | |||
Android App | N/A | Yes | |
iOS App | |||
iOS App | N/A | Yes | |
Mic Quality | |||
Mic Quality | 2.5/10 | 8.5/10 | |
BUILD AND DESIGN | |||
|---|---|---|---|
Build Quality | |||
Build Quality | 8.5/10 | 8/10 | |
Comfort score | |||
Comfort score | 7/10 | 7/10 | |
Size | |||
Size | Large | N/A | |
Weight (headset or single earbud) | |||
Weight (headset or single earbud) | 27 Grams | 240.4 Grams | |
Microphone style | |||
Microphone style | N/A | Integrated | |
Shopping
KZ ZSN Pro X
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Dig into reviews and images
Soundguys
Jasper Lastoria | April 2023
"The KZ ZSN PRO X offers superb sound for very little money, like under $30 USD. It has some rough edges with a plastic seam on the cable that can rub on your ear, and the bud is a bit large. The tech isn't cutting edge, but new doesn't always equal better. You should try it."
Sennheiser 450BT
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Sound Guys
Lily Katz | March 2022
"The Sennheiser HD 450BT is a very good pair of headphones for the price, noise canceling is good and sound quality is great—quite rare at this price point. Like any product, this headset isn’t without its faults."
Get a great deal on the KZ ZSN Pro X or the Sennheiser 450BT
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 Chowdhury
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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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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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