Short answer: the DUNU SA6 MK2. It ranks #969 of 1291 in-ear headphones by sound quality, rated 3.1/5, at $559; the Fatfreq Reference Pro SE ranks #987, rated 3.0/5, and costs $599, so there is not much of a tradeoff to weigh.
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. The tradeoff: Presence sits about 6.8 dB low with an 8.6 dB dip near 5.6 kHz, so vocals and instruments lose some bite.
The case for the Fatfreq Reference Pro SE: It is a wired, closed-back in-ear that blocks outside noise passively. Watch for: In crinacle’s measurement it scores only 62.0 for preference, with a 3.18 dB deviation from target, so the tuning departs noticeably from what most listeners prefer.
Buy the DUNU SA6 MK2. It is rated higher for sound quality than the Fatfreq Reference Pro SE and costs less, which makes it the one to get unless you need something the other one does better.
Still deciding? The full Headphones rankings cover every ranked option.
Bass sits close to target and holds down to 20 Hz, so low end sounds full without bloat.
Amazon $559.00 eBay
It is a wired, closed-back in-ear that blocks outside noise passively.
FATfreq $599.00 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 | Fatfreq Reference Pro SE | |
|---|---|---|
| Price | $559.00 | $599.00 |
| Ranked | #969 of 1291 in In-Ear Headphones | #987 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Connection | Wired | Wired |
| Driver Type | Balanced armature | - |
| Drivers | 6 x balanced armature | - |
| Impedance | 24 ohms | - |
| Frequency Response | 5Hz - 40kHz | 20Hz - 20kHz (Manufacturer specified) |
| Harman Preference Score | 63 (median of 22 squig.link measurements, calibrated to AutoEQ) | 62 (measured by crinacle, via AutoEQ) |
| Deviation From Target | 2.73 dB standard deviation | 3.18 dB standard deviation |
| Tonal Tilt | -0.88 (negative is warmer, positive brighter) | +0.31 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-1.4 dB at 30 Hz) | - |
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