Skip to content
HearWiki

HiFiMAN RE400i vs KZ PRX: which should you buy?

On aggregated review scores the KZ PRX comes out ahead with a HearWiki score of 80. The full breakdown - sub-scores, specs and what reviewers actually said - is below.

Our pick: KZ PRX - Great overall at around $55.

Score breakdown

Each axis is a 0–10 blend of what reviewers scored, not a lab measurement.

KZ PRX leads on 4 of 4 measures.

  • HiFiMAN RE400i
  • KZ PRX
HearWiki score
57
80
Sound
6.5
7.8
Value
3.5
8.6
Price (USD)
$64
$55

Generation & platform

The scores rank quality. This is the other question: is the newer one actually newer technology, or the same platform in a new shell?

Same generation

Both shipped in 2024. These are the same generation of hardware - nothing in the radio, the codecs or the noise cancelling separates them. Nothing separates them on convenience features either, so the choice comes down to tuning and price.

  • RE400i2024
  • PRX2024

Specifications

RE400iPRX
Type
Wired IEMs
Wired IEMs
Price (USD)
$64
$55
HearWiki score
57
80
Released
2024
2024
Availability
Discontinued
Still sold new
Driver
8.5 mm driver
planar magnetic
Driver type
-
planar
Driver size
8.5 mm
-
Drivers per side
1
-
Frequency response
15 Hz - 22 kHz
-
Impedance
32 Ω
15 Ω
Sensitivity
102 dB/mW
-
Active noise cancelling
No
-
ANC type
none
-
Transparency mode
No
-
Companion app
No
-
Custom EQ
No
-
Wear detection
No
-
Controls
buttons
-
Voice assistant
No
-
Weight
13.5 g
-
USB-C
No
-
Connector
3.5 mm
-
Microphones
1
-

What reviewers said

HiFiMAN RE400i

The HiFiMAN RE400i is a lightweight, wired IEM that delivers a smooth, balanced, and detailed sound signature, making it a strong value for budget-conscious listeners who prioritize clarity over bass punch. Its compact fit and comfortable design are complemented by a decent accessory set, though the build quality—especially the cable—is a notable weak point. Best suited for acoustic, classical, or critical listening, it lacks modern extras like app support or a robust remote.

  • Pro:Accurate, detailed midrange and treble
  • Pro:Neutral, non-fatiguing tuning
  • Pro:Very lightweight and comfortable
  • Con:Bass is restrained and lacks impact
  • Con:Cable is thin and feels fragile
  • Con:No app support or advanced features

KZ PRX

The KZ PRX is a budget-friendly planar magnetic IEM that offers a balanced, warm-leaning sound with strong detail retrieval and capable imaging for its price. It excels in sub-bass presence and smooth mids, though it demands proper amplification and ear tips to perform at its best. Its soundstage is decent but not exceptionally wide, and the stock cable is a noted weak point.

  • Pro:Excellent value for a planar IEM
  • Pro:Balanced, warm sound with good detail
  • Pro:Strong imaging and separation for the price
  • Con:Requires a capable source and good ear tips
  • Con:Stock cable limits performance
  • Con:Soundstage is only medium-sized

Summaries are AI-condensed and paraphrased from published reviews and specs - not original hands-on testing. More on our method.

Compare something else

Swap either side out, or start again from the picker.

New comparisonHiFiMAN RE400iKZ PRX