Short answer: a tie on sound quality. Both are rated 3.7/5 (#643 and #675 of 1291 in-ear headphones) at nearly the same price ($349 vs $349), so choose on features and fit.
What the DUNU Vulkan 2 does well: The median of 15 hobbyist measurements gives it a solid Harman preference score of 70 with a 2.16 dB spread, and its mids sit within about 1.1 dB of target, so vocals and instruments sound natural. The tradeoff: Presence sits about 5.3 dB low with a 6.9 dB dip near 4.0 kHz, so vocals and instruments lose some bite.
What the Penon Fan 3 does well: A broadly balanced tuning with a preference score of 70 against the Harman target. Watch for: An uneven response, 2.4 dB standard deviation from target.
Buy the DUNU Vulkan 2 or the Penon Fan 3 on features: they are rated the same for sound quality at close to the same price.
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The median of 15 hobbyist measurements gives it a solid Harman preference score of 70 with a 2.16 dB spread, and its mids sit within about 1.1 dB of target, so vocals and instruments sound natural.
Amazon $349.00 eBay
A broadly balanced tuning with a preference score of 70 against the Harman target.
Amazon $349.00 Penon Audio $349 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 Vulkan 2 | Penon Fan 3 | |
|---|---|---|
| Price | $349.00 | $349.00 |
| Ranked | #643 of 1291 in In-Ear Headphones | #675 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Connection | Wired | Wired (3.5mm / 4.4mm) |
| Driver Type | Hybrid | Tribrid |
| Drivers | 1 x 10mm dynamic + 1 x 8mm dynamic + 6 x balanced armature | 1 Dynamic, 2 Balanced Armature, 1 Bone Conduction |
| Impedance | 35 ohms | - |
| Sensitivity | 113 dB/mW | - |
| Frequency Response | 5Hz - 40kHz (Manufacturer specified) | - |
| Weight | 0 lbs (8 g) | - |
| Harman Preference Score | 70 (median of 15 squig.link measurements, calibrated to AutoEQ) | 70 (median of 10 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.16 dB standard deviation | 2.38 dB standard deviation |
| Tonal Tilt | +0.14 (negative is warmer, positive brighter) | -0.16 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-3.7 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-3.2 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 DUNU Vulkan 2 from atechreviews, audioamigo, dl, gadgetgenerations, hbb, hobbytalk, hu-fi, jaytiss, joycesreview, kr0mka, pw, soundignity, superreview, timmyv and treblewellxtended; the Penon Fan 3 from aden, audioamigo, dl, flare, isaiahse, jaytiss, koi, sl0the, superreview, theaudiostore and treblewellxtended, all via squig.link.
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