Short answer: the BQEYZ Frost. Both are rated 3.0/5 for sound quality (#1002 and #982 of 1291 in-ear headphones), and the BQEYZ Frost costs $179 against $229.99 for the Etymotic ER4XR, with sound quality a draw, the lower price decides it.
Why pick the BQEYZ Frost: Lower mids sit within about 0.5 dB of target, keeping voices and guitars natural. The tradeoff: Presence sits about 5.5 dB low with an 8.1 dB dip near 3.5 kHz, so vocals and instruments lose some bite.
Why pick the Etymotic ER4XR: Upper mids sit within 0.5 dB of the Harman target and low mids within 0.4 dB, so vocals and instruments come through clearly and naturally. The tradeoff: Sub-bass is about 7.2 dB under target and bass is 2.6 dB low, so kick drums and bass lines lack weight and rumble.
Buy the BQEYZ Frost. Both are rated the same for sound quality, and it costs $50.99 less than the Etymotic ER4XR.
Looking for alternatives? See the complete Headphones rankings.
Lower mids sit within about 0.5 dB of target, keeping voices and guitars natural.
Amazon $179.00 eBay
Upper mids sit within 0.5 dB of the Harman target and low mids within 0.4 dB, so vocals and instruments come through clearly and naturally.
Amazon $229.99 eBayPrices on this page were last checked October 16, 2026 at 5:46 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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Specifications Side By Side
| BQEYZ Frost | Etymotic ER4XR | |
|---|---|---|
| Price | $179.00 | $229.99 |
| Ranked | #1002 of 1291 in In-Ear Headphones | #982 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Connection | Wired | Wired |
| Driver Type | Hybrid | Balanced armature |
| Drivers | 1 x 10mm dynamic + micro planar | 1 x balanced armature |
| Impedance | 32 ohms | 45 ohms |
| Frequency Response | 5Hz - 40kHz | 20Hz - 16kHz (Manufacturer specified) |
| Harman Preference Score | 61 (median of 10 squig.link measurements, calibrated to AutoEQ) | 62 (measured by oratory1990, via AutoEQ) |
| Deviation From Target | 3.28 dB standard deviation | 3.06 dB standard deviation |
| Tonal Tilt | +0.13 (negative is warmer, positive brighter) | +0.61 (negative is warmer, positive brighter) |
| Sub-bass Extension | Falls 6 dB below target at 36 Hz (-6.7 dB at 30 Hz) | Falls 6 dB below target at 47 Hz (-7.0 dB at 30 Hz) |
Frequency Response Compared
Both headphones’ measurements overlaid on the Harman target. Above the target sounds louder in that range, below it quieter. Each curve is the median of several independent measurements, shifted so its 500 Hz to 2 kHz average sits at 0 dB, so only the tuning is compared.
Measurement data: the BQEYZ Frost from atechreviews, bassaudio, cqtek, digaoreviews, fahryst, faxepremium, kazi, kuping-sensi, soundcheck39 and superreview; the Etymotic ER4XR from aden, dchpgall, dentreviews, musicafe, precog and superreview, all via squig.link.
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