Short answer: a tie on sound quality. Both are rated 3.9/5 (#483 and #528 of 1291 in-ear headphones) at nearly the same price ($170.10 vs $169), so choose on features and fit.
The case for the Pula PA02: The median of 17 hobbyist measurements gives it a solid Harman preference score of 73 with a 1.93 dB spread, and its mids sit within about 0.8 dB of target, so vocals and instruments sound natural. The tradeoff: Presence sits about 4.8 dB low with a 7.4 dB dip near 5.8 kHz, so vocals and instruments lose some bite.
The case for the TRI i3 MK3: The median of 14 hobbyist measurements gives it a solid Harman preference score of 72 with a 2.04 dB spread, and its mids sit within about 0.5 dB of target, so vocals and instruments sound natural. The tradeoff: Presence sits about 5.3 dB low with an 8.3 dB dip near 6.9 kHz, so vocals and instruments lose some bite.
Buy the Pula PA02 or the TRI i3 MK3 on features: they are rated the same for sound quality at close to the same price.
Looking for alternatives? See the complete Headphones rankings.
The median of 17 hobbyist measurements gives it a solid Harman preference score of 73 with a 1.93 dB spread, and its mids sit within about 0.8 dB of target, so vocals and instruments sound natural.
HiFiGo $170.10 eBay
The median of 14 hobbyist measurements gives it a solid Harman preference score of 72 with a 2.04 dB spread, and its mids sit within about 0.5 dB of target, so vocals and instruments sound natural.
Amazon $169.00 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
| Pula PA02 | TRI i3 MK3 | |
|---|---|---|
| Price | $170.10 | $169.00 |
| Ranked | #483 of 1291 in In-Ear Headphones | #528 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Connection | Wired | Wired |
| Driver Type | Hybrid | Tribrid |
| Drivers | 1 x 10mm dynamic + 4 x balanced armature | 1 x 10mm dynamic + 1 x balanced armature + 1 x 10mm planar |
| Impedance | 36 ohms | 21 ohms |
| Frequency Response | 20Hz - 20kHz (Manufacturer specified) | 20Hz - 20kHz |
| Harman Preference Score | 73 (median of 17 squig.link measurements, calibrated to AutoEQ) | 72 (median of 14 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 1.93 dB standard deviation | 2.04 dB standard deviation |
| Tonal Tilt | -0.65 (negative is warmer, positive brighter) | -0.24 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-0.2 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-2.6 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 Pula PA02 from aftersound, atechreviews, audioamigo, breampike, dchpgall, fernandagunsan, gadgetgenerations, harpo, iemocean, jaytiss, mmagtech, riz, silicagel, sl0the, soundignity, tgx78, timmyv and tonedeafmonk; the TRI i3 MK3 from aden, arn, atechreviews, audioamigo, boizoff, eplv, flare, iemocean, jaytiss, koi, sl0the, soundcheck39, timmyv and tonedeafmonk, all via squig.link.
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