Short answer: the DUNU SA6 MK2. Both are rated 3.1/5 for sound quality (#969 and #975 of 1291 in-ear headphones), and the DUNU SA6 MK2 costs $559 against $699 for the Softears RSV MKII, so with nothing between them on sound quality, price settles it.
The case for the DUNU SA6 MK2: 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.
What the Softears RSV MKII does well: Five balanced armature drivers at 7 ohms and 122 dB/Vrms make it very easy to drive from a phone or dongle. Watch for: The bass lift spills into the low mids at 1.4 dB over target while presence sits 3.0 dB down with a 4.7 dB dip near 6.1 kHz, so the sound leans thick and vocals lose some clarity, for a preference score of 63.2 across 13 squig.link measurements.
Buy the DUNU SA6 MK2. Both are rated the same for sound quality, and it costs $140 less than the Softears RSV MKII.
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Bass sits close to target and holds down to 20 Hz, so low end sounds full without bloat.
Amazon $559.00 eBay
Five balanced armature drivers at 7 ohms and 122 dB/Vrms make it very easy to drive from a phone or dongle.
Amazon $699.00 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
| DUNU SA6 MK2 | Softears RSV MKII | |
|---|---|---|
| Price | $559.00 | $699.00 |
| Ranked | #969 of 1291 in In-Ear Headphones | #975 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Connection | Wired | Wired |
| Driver Type | Balanced armature | Balanced armature |
| Drivers | 6 x balanced armature | 5 x balanced armature |
| Impedance | 24 ohms | 7 ohms |
| Frequency Response | 5Hz - 40kHz | 20Hz - 20kHz (Manufacturer specified) |
| Harman Preference Score | 63 (median of 22 squig.link measurements, calibrated to AutoEQ) | 63 (median of 13 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.73 dB standard deviation | 2.46 dB standard deviation |
| Tonal Tilt | -0.88 (negative is warmer, positive brighter) | -1.07 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-1.4 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (+1.1 dB at 30 Hz) |
| Sensitivity | - | 122 dB/Vrms |
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 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; the Softears RSV MKII from aftersound, animagus, atechreviews, audioamigo, cammyfi, jaytiss, listener, precog, silicagel, sl0the, soundignity, superreview and tonedeafmonk, all via squig.link.
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