Short answer: the Custom Art FIBAE 7 Unlimited. It ranks #858 of 1291 in-ear headphones by sound quality, rated 3.4/5, at $1,620; the Fir Audio e12 ranks #943, rated 3.2/5, and costs $1,799, which makes this an easy call rather than a real tradeoff.
What the Custom Art FIBAE 7 Unlimited does well: A broadly balanced tuning with a preference score of 67 against the Harman target. The tradeoff: Treble about 2 dB below target from 3 to 10 kHz, which can sound dull or veiled next to brighter headphones.
What the Fir Audio e12 does well: A big, energetic V shaped tuning in HypetheSonics’ measurement, with sub-bass about 4 dB and bass about 5.5 dB above target for heavy, physical kick drums and synth lines. Watch for: A 9.3 dB peak near 8.1 kHz and treble about 5 dB above target from 6 to 10 kHz can make cymbals and sibilance sharp and fatiguing at higher volume.
Buy the Custom Art FIBAE 7 Unlimited. It is rated higher for sound quality than the Fir Audio e12 and costs less, so it is the default pick unless a specific strength of the other one matters more to you.
Still deciding? The full Headphones rankings cover every ranked option.
A broadly balanced tuning with a preference score of 67 against the Harman target.
Custom Art $1,620.00 eBay
A big, energetic V shaped tuning in HypetheSonics’ measurement, with sub-bass about 4 dB and bass about 5.5 dB above target for heavy, physical kick drums and synth lines.
Audio46 $1,799.00 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
| Custom Art FIBAE 7 Unlimited | Fir Audio e12 | |
|---|---|---|
| Price | $1,620.00 | $1,799.00 |
| Ranked | #858 of 1291 in In-Ear Headphones | #943 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 67 (median of 4 squig.link measurements, calibrated to AutoEQ) | 64 (measured by HypetheSonics, via AutoEQ) |
| Deviation From Target | 2.49 dB standard deviation | 2.66 dB standard deviation |
| Tonal Tilt | -0.42 (negative is warmer, positive brighter) | -0.62 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-3.2 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (+3.5 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Balanced Armature | Dynamic |
| Drivers | 7 x balanced armature (2 sub-low, 1 low-mid, 2 mid-high, 1 high, 1 super high) | 1 x 12mm dynamic |
| Impedance | 12 ohms | 16 ohms |
| Sensitivity | 122 dB | - |
| Frequency Response | 10Hz - 21kHz | 20Hz - 20kHz (Manufacturer specified) |
| Built-in Microphone | - | No |
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 Custom Art FIBAE 7 Unlimited from dl, harutohiroki, hbb and precog; the Fir Audio e12 from aftersound, eliseaudio, jaytiss, sl0the, tgx78, theaudiostore and treblewellxtended, all via squig.link.
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