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What we think
The PerfectRec Earbuds or Headphones team Learn more
Updated January 10, 2024·
If you prioritize high-fidelity sound and are willing to invest more, the Etymotic ER4XR earbuds offer superior sound isolation and accuracy, making them excellent for analytical listening. On the other hand, the KZ ZSN Pro provides decent sound quality at a budget-friendly price, including some versatility with cable customization. The ER4XR's fit and isolation might be uncomfortable for some due to deep ear insertion but are ideal for noisy environments. The KZ ZSN Pro offers a more comfortable fit for everyday use, though they may not isolate sound as effectively as the ER4XR. Both lack features like Bluetooth and active noise cancellation, so if you require wireless freedom or silence from your environment, neither may suit your needs. 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 Etymotic ER4XR
- Very good for music
- Good for podcasts and audiobooks
Advantages of the KZ ZSN Pro
- The KZ ZSN Pro has no clear advantages over the Etymotic ER4XR.
Key differences
Phone Calls
4.7
3.1
The Etymotic ER4XR and KZ ZSN Pro are both poor for phone calls, though the Etymotic ER4XR is somewhat better.
Podcasts and Audiobooks
7.3
4.9
The Etymotic ER4XR is good for podcasts and audiobooks, while the KZ ZSN Pro is poor.
Noise Reduction
9.1
5.3
The Etymotic ER4XR is excellent for noise reduction, while the KZ ZSN Pro is poor.
Cost
$234
$21
$0
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$100
$150
$200
$250
$300
$350
The Etymotic ER4XR has a price of $234 and the KZ ZSN Pro costs $21.
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Key similarities
Music
8.0
7.7
Although they have very similar scores, PerfectRec considers Etymotic ER4XR to be very good for music, while the KZ ZSN Pro is good.
Gaming
6.2
6.0
The Etymotic ER4XR and KZ ZSN Pro are both only fair for gaming.
TV and Video
7.4
7.4
The KZ ZSN Pro and Etymotic ER4XR are both good for TV and video.
Build Quality
9.0
9.0
The Etymotic ER4XR and KZ ZSN Pro both have excellent build quality.
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How the Etymotic ER4XR and the KZ ZSN Pro compare to other earbuds and headphones
Spec Comparison
 |  | |
| Etymotic ER4XR | KZ ZSN Pro |
GENERAL | |||
|---|---|---|---|
| Price | |||
$234 | $21 | ||
Brand | |||
Brand | Etymotic | KZ | |
Release Date | |||
Release Date | June 1, 2016 | March 1, 2019 | |
Form Factor | |||
Form Factor | Earbuds | Earbuds | |
Connectivity | |||
Connectivity | Wired | Wired | |
SOUND | |||
|---|---|---|---|
Music Score | |||
Music Score | 8/10 | 7.8/10 | |
Phone Calls Score | |||
Phone Calls Score | 4.8/10 | 3.2/10 | |
Gaming Score | |||
Gaming Score | 6.3/10 | 6/10 | |
TV and Video Score | |||
TV and Video Score | 7.4/10 | 7.5/10 | |
Exercise Score | |||
Exercise Score | 4.1/10 | 4.3/10 | |
FEATURES | |||
|---|---|---|---|
Active Noise Cancelling | |||
Active Noise Cancelling | No | No | |
Noise Reduction Score | |||
Noise Reduction Score | 9.1/10 | 5.3/10 | |
BUILD AND DESIGN | |||
|---|---|---|---|
Build Quality | |||
Build Quality | 9/10 | 9/10 | |
Comfort score | |||
Comfort score | 6/10 | 7.6/10 | |
Size | |||
Size | Small | Large | |
Weight (headset or single earbud) | |||
Weight (headset or single earbud) | 4 Grams | 7 Grams | |
Waterproof Rating | |||
Waterproof Rating | 0 | 0 | |
Shopping
Etymotic ER4XR
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Dig into reviews and images
What HiFi?
What HiFi? | May 2015
"The Etymotic ER4XRs' top qualities are the detail and definition of the midrange, rewarding the closest listening. While the soundstage is large rather than gigantic, the excellent separation and spatial precision mean you can dive deep into music just as much as when wearing a pair of full-size open-backed headphones."
KZ ZSN Pro
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Dig into reviews and images
PrimeAudio
David Becker | 2019
"Undoubtedly the focus and the star of the show, the ZSN Pro’s bass is big, bold and bangin’. The amount of gusto in the low end should satisfy anyone who likes a large lick of bass and even certified bassheads will probably get a kick out of this."
Get a great deal on the Etymotic ER4XR or the KZ ZSN Pro
About Etymotic
Etymotic Research is an American based research, development and manufacturing company founded in 1983. They invented the first insert earphones that were used for the diagnosis and research of hearing loss and other auditory disorders. They went on to pioneer the market of high fidelity, isolating, in-ear earphones.
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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
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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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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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