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What we think
The PerfectRec Earbuds or Headphones team Learn more
Updated April 11, 2024·
If cost is a major factor, the KZ ZSN Pro X would be a more budget-friendly option. For music listening, the KZ ZSN Pro X offers good overall sound quality with the added versatility of a detachable cable and the possibility of upgrading to balanced audio with appropriate cables. However, for phone calls and meetings, the mic quality is poor, and they might not be ideal for exercise, given they're not sweatproof. The Sennheiser CX300S is more expensive but provides better passive noise isolation, substantial build quality, and a more comfortable design, albeit with non-detachable cables. Neither earbud supports wireless features or active noise cancelling, so if these are important to you, you may want to consider other options. If you need something sturdier for daily use and commute, Sennheiser might be more suitable, but for a cost-efficient choice with decent music playback, the KZ ZSN Pro X fits the bill. 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 CX300S
- The Sennheiser CX300S has no clear advantages over the KZ ZSN Pro X.
Key differences
Noise Reduction
6.0
7.0
The Sennheiser CX300S is good for noise reduction, while the KZ ZSN Pro X is only fair.
Cost
$24
$50
$0
$10
$20
$30
$40
$50
The KZ ZSN Pro X has a price of $24 and the Sennheiser CX300S costs $50.
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Key similarities
Music
7.0
6.9
Although they have very similar scores, PerfectRec considers KZ ZSN Pro X to be good for music, while the Sennheiser CX300S is only fair.
Gaming
5.9
6.1
Although they have very similar scores, PerfectRec considers Sennheiser CX300S to be only fair for gaming, while the KZ ZSN Pro X is poor.
Phone Calls
3.1
3.0
The KZ ZSN Pro X and Sennheiser CX300S are both poor for phone calls.
Podcasts and Audiobooks
4.7
4.7
The Sennheiser CX300S and KZ ZSN Pro X are both poor for podcasts and audiobooks.
TV and Video
7.3
7.3
The Sennheiser CX300S and KZ ZSN Pro X are both good for TV and video.
Build Quality
8.5
8.0
The KZ ZSN Pro X and Sennheiser CX300S both have very good build quality.
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How the KZ ZSN Pro X and the Sennheiser CX300S compare to other earbuds and headphones
Spec Comparison
 |  | |
| KZ ZSN Pro X | Sennheiser CX300S |
GENERAL | |||
|---|---|---|---|
| Price | |||
$24 | $50 | ||
Brand | |||
Brand | KZ | Sennheiser | |
Release Date | |||
Release Date | June 1, 2020 | February 1, 2019 | |
Form Factor | |||
Form Factor | Earbuds | Earbuds | |
Connectivity | |||
Connectivity | Wired | Wired | |
SOUND | |||
|---|---|---|---|
Music Score | |||
Music Score | 7/10 | 7/10 | |
Phone Calls Score | |||
Phone Calls Score | 3.1/10 | 3.1/10 | |
Gaming Score | |||
Gaming Score | 6/10 | 6.1/10 | |
TV and Video Score | |||
TV and Video Score | 7.3/10 | 7.4/10 | |
Exercise Score | |||
Exercise Score | 4.2/10 | 4.2/10 | |
FEATURES | |||
|---|---|---|---|
Active Noise Cancelling | |||
Active Noise Cancelling | No | No | |
Noise Reduction Score | |||
Noise Reduction Score | 6/10 | 7/10 | |
Virtual Surround | |||
Virtual Surround | No | No | |
Mic Quality | |||
Mic Quality | 2.5/10 | N/A | |
BUILD AND DESIGN | |||
|---|---|---|---|
Build Quality | |||
Build Quality | 8.5/10 | 8/10 | |
Comfort score | |||
Comfort score | 7/10 | 7.6/10 | |
Size | |||
Size | Large | Small | |
Weight (headset or single earbud) | |||
Weight (headset or single earbud) | 27 Grams | 12 Grams | |
Waterproof Rating | |||
Waterproof Rating | 0 | 0 | |
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 CX300S
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Major HiFi
Carroll Moore | April 2019
"Sennheiser offers impressive bang for your buck when it comes to the CX 300S. Built like a tank and sounding surprisingly good for such a budget-minded earphone, the CX 300S out-classes many of its would-be competitors. Functional but beautiful, it’s the perfect in-ear listening solution for anyone who wants to hear everything and look good doing it."
Get a great deal on the KZ ZSN Pro X or the Sennheiser CX300S
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
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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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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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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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