Short answer: the Plunge Audio Unity Dynamic. Both are rated 4.0/5 for sound quality (#459 and #399 of 1291 in-ear headphones), and the Plunge Audio Unity Dynamic costs $379 against $399 for the ThieAudio Hype 4 MKII, and with sound quality even, the cheaper one is the better buy.
Why pick the Plunge Audio Unity Dynamic: A broadly balanced tuning with a preference score of 73 against the Harman target. The catch: An uneven response, 2.2 dB standard deviation from target.
What the ThieAudio Hype 4 MKII does well: The median of 11 hobbyist measurements gives it a solid Harman preference score of 74 with a 1.68 dB spread. Watch for: Presence sits about 4.4 dB low with a 6 dB dip near 4.7 kHz, so vocals and instruments lose some bite.
Buy the Plunge Audio Unity Dynamic. Both are rated the same for sound quality, and it costs $20 less than the ThieAudio Hype 4 MKII.
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A broadly balanced tuning with a preference score of 73 against the Harman target.
Plunge Audio $379 eBay
The median of 11 hobbyist measurements gives it a solid Harman preference score of 74 with a 1.68 dB spread.
Amazon $399.00 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
| Plunge Audio Unity Dynamic | ThieAudio Hype 4 MKII | |
|---|---|---|
| Price | $379 | $399.00 |
| Ranked | #459 of 1291 in In-Ear Headphones | #399 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 73 (median of 4 squig.link measurements, calibrated to AutoEQ) | 74 (median of 11 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.15 dB standard deviation | 1.68 dB standard deviation |
| Tonal Tilt | +0.09 (negative is warmer, positive brighter) | -0.54 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-1.7 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-0.5 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Hybrid (2 dynamic + 4 balanced armature) |
| Drivers | 1 x 10mm dynamic | 2 x 8mm dynamic + 4 x balanced armature |
| Impedance | - | 18 ohms |
| Sensitivity | - | 101 dB |
| Frequency Response | - | 5Hz - 22kHz (Manufacturer specified) |
| Built-in Microphone | - | No |
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 Plunge Audio Unity Dynamic from aden, audioamigo, pw and tonedeafmonk; the ThieAudio Hype 4 MKII from aftersound, atechreviews, bassaudio, ducbloke, eliseaudio, joycesreview, koi, practiphile, precog, soundcheck39 and tonedeafmonk, all via squig.link.
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