Short answer: the 64 Audio U18S. It ranks #963 of 1291 in-ear headphones by sound quality, rated 3.1/5, at $2,999; the 64 Audio Tia Fourte ranks #1051, rated 2.8/5, and costs $3,599, so there is not much of a tradeoff to weigh.
The 64 Audio U18S is the better-sounding choice. Eighteen balanced armature drivers per side deliver a warm, relaxed tuning with bass about 1.6 dB above target and sub-bass within 6 dB of target down to 20 Hz. Watch for: Across seven hobbyist measurements on squig.link, the 3 to 6 kHz presence region sits about 6 dB below target with a 9 dB dip near 5.8 kHz, so vocals and guitars lose bite and fine detail sounds veiled.
The case for the 64 Audio Tia Fourte: Lower mids sit within about 0.9 dB of target, keeping voices and guitars natural. The tradeoff: Presence sits about 7.1 dB low with a 10.9 dB dip near 3.5 kHz, so vocals and instruments lose some bite.
Buy the 64 Audio U18S. It is rated higher for sound quality than the 64 Audio Tia Fourte and costs less, which makes it the one to get unless you need something the other one does better.
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Eighteen balanced armature drivers per side deliver a warm, relaxed tuning with bass about 1.6 dB above target and sub-bass within 6 dB of target down to 20 Hz.
64 Audio $2,999.00 eBay
Lower mids sit within about 0.9 dB of target, keeping voices and guitars natural.
Headphones.com $3,599.00 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
| 64 Audio U18S | 64 Audio Tia Fourte | |
|---|---|---|
| Price | $2,999.00 | $3,599.00 |
| Ranked | #963 of 1291 in In-Ear Headphones | #1051 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | - |
| Harman Preference Score | 63 (measured by crinacle, via AutoEQ) | 59 (measured by HypetheSonics, via AutoEQ) |
| Deviation From Target | 2.78 dB standard deviation | 3.03 dB standard deviation |
| Tonal Tilt | -0.81 (negative is warmer, positive brighter) | -0.43 (negative is warmer, positive brighter) |
| Connection | Wired | Wired |
| Driver Type | Balanced armature | Hybrid |
| Drivers | 18 x balanced armature (1 tia high + 1 high-mid + 8 mid + 8 low) | 1 x dynamic + 3 x balanced armature (tia) |
| Impedance | 8 ohms | 10 ohms |
| Sensitivity | 106 dB/mW | 114 dB/mW |
| Frequency Response | 10Hz - 20kHz (Manufacturer specified) | 5Hz - 22kHz |
| Built-in Microphone | No | - |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-2.7 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-2.2 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 64 Audio U18S from aftersound, dchpgall, precog, recode, superreview, theaudiostore and treblewellxtended; the 64 Audio Tia Fourte from aden, dl, elrics, hbb and precog, all via squig.link.
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