Short answer: the Penon Impact for better sound quality, the DUNU SA6 MK2 for the lower price. The Penon Impact ranks #995 of 1369 in-ear headphones, rated 3.2/5, at $2,499. The DUNU SA6 MK2 ranks #1027, rated 3.1/5, at $559, $1,940 cheaper.
The case for the Penon Impact: A published AutoEQ preset corrects its response toward the Harman target, so a few minutes of EQ setup closes most of the gap. The tradeoff: Treble about 5 dB below target from 3 to 10 kHz, which can sound dull or veiled next to brighter headphones.
What the DUNU SA6 MK2 does well: Bass sits close to target and holds down to 20 Hz, so low end sounds full without bloat. Watch for: Presence sits about 6.8 dB low with an 8.6 dB dip near 5.6 kHz, so vocals and instruments lose some bite.
Buy the Penon Impact if sound quality is the priority over the price, or the DUNU SA6 MK2 if the price is the priority over sound quality.
Looking for alternatives? See the complete Headphones rankings.
A published AutoEQ preset corrects its response toward the Harman target, so a few minutes of EQ setup closes most of the gap.
Penon Audio $2,499.00 eBay
Bass sits close to target and holds down to 20 Hz, so low end sounds full without bloat.
Amazon $559.00 eBayPrices on this page were last checked October 17, 2026 at 6:04 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
| Penon Impact | DUNU SA6 MK2 | |
|---|---|---|
| Price | $2,499.00 | $559.00 |
| Ranked | #995 of 1369 in In-Ear Headphones | #1027 of 1369 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 64 (median of 4 squig.link measurements, calibrated to AutoEQ) | 63 (median of 22 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.87 dB standard deviation | 2.73 dB standard deviation |
| Tonal Tilt | -0.56 (negative is warmer, positive brighter) | -0.88 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-2.9 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-1.4 dB at 30 Hz) |
| Driver Type | Hybrid | Balanced armature |
| Drivers | 14 drivers (10 balanced armatures + 4 electrostatic drivers) | 6 x balanced armature |
| Impedance | 21 ohms | 24 ohms |
| Sensitivity | 112 dB | - |
| Frequency Response | 10Hz - 70kHz | 5Hz - 40kHz |
| Connection | Wired | Wired |
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 Penon Impact from ducbloke, eliseaudio, tgx78 and tonedeafmonk; the DUNU SA6 MK2 from ankramutt, atechreviews, boizoff, bukanaudiophile, dl, ducbloke, eliseaudio, hbb, iemocean, jaytiss, koi, nymz, practiphile, precog, recode, sl0the, soundcheck39, soundignity, superreview, therollo9, timmyv and tonedeafmonk, all via squig.link.
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