Short answer: the NF Audio RA15. It ranks #265 of 450 in-ear headphones by sound quality, rated 4.0/5, at $89; the Tin HiFi T4 ranks #277, rated 3.9/5, at $89. Close enough in price that the sound-quality gap is the deciding factor.
The case for the Tin HiFi T4: It earns a preference score of 73 in crinacle’s measurement, and across squig.link measurements bass and mids stay within about 1.3 dB of target from 20 Hz to 3 kHz, giving natural voices and well judged bass. The tradeoff: In squig.link measurements a 6.7 dB dip near 10 kHz and about 3 dB less presence from 3 to 6 kHz take some sparkle and edge off cymbals and guitars.
Buy the NF Audio RA15. It is rated higher for sound quality than the Tin HiFi T4 at the same price, so only choose the other one for a particular feature it does better.
Still deciding? The full Headphones rankings cover every ranked option.
Specifications Side By Side
| NF Audio RA15 | Tin HiFi T4 | |
|---|---|---|
| Price | $89.00 | $89.00 |
| Ranked | #265 of 450 in In-Ear Headphones | #277 of 450 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 73 (median of 7 squig.link measurements, calibrated to AutoEQ) | 73 (measured by crinacle, via AutoEQ) |
| Deviation From Target | 2.15 dB standard deviation | 2.44 dB standard deviation |
| Tonal Tilt | -0.05 (negative is warmer, positive brighter) | +0.10 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-1.6 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-1.1 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Dynamic |
| Drivers | 1 x dynamic | 1 x 10mm dynamic |
| Impedance | 32 ohms | 32 ohms |
| Sensitivity | 108 dB/mW | 102 dB |
| Frequency Response | 10Hz - 40kHz (Manufacturer specified) | 10Hz - 20kHz (Manufacturer specified) |
| Weight | 0 lbs (9 g) per earbud | - |
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Prices on this page were last checked October 11, 2026 at 4:59 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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The Two Headphones In Full
NF Audio RA15: $89.00 Amazon eBay
Full NF Audio RA15 review and specifications →
| Released | Oct 2024 (2 years ago) |
|---|---|
| Back | Closed |
| Connection | Wired |
| Deviation From Target | 2.15 dB standard deviation |
| Driver Type | Dynamic |
| Drivers | 1 x dynamic |
| Form Factor | In-ear |
| Frequency Response | 10Hz - 40kHz (Manufacturer specified) |
| Harman Preference Score | 73 (median of 7 squig.link measurements, calibrated to AutoEQ) |
| Impedance | 32 ohms |
| Sensitivity | 108 dB/mW |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-1.6 dB at 30 Hz) |
| Tonal Tilt | -0.05 (negative is warmer, positive brighter) |
| Weight | 0 lbs (9 g) per earbud |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
Tin HiFi T4: $89.00 Amazon eBay
Pros: It earns a preference score of 73 in crinacle’s measurement, and across squig.link measurements bass and mids stay within about 1.3 dB of target from 20 Hz to 3 kHz, giving natural voices and well judged bass. Sub-bass is only about 1 dB down at 30 Hz, so kick drums keep their weight. At 32 ohms and 102 dB it runs from a phone, and it rates level with the Etymotic ER2XR for less money and above the KZ PR1 at a similar price.
Cons: In squig.link measurements a 6.7 dB dip near 10 kHz and about 3 dB less presence from 3 to 6 kHz take some sparkle and edge off cymbals and guitars. Listeners who want a brighter, more vivid top end may find it slightly polite.
Full Tin HiFi T4 review and specifications →
| Released | Nov 2019 (6 years ago) |
|---|---|
| Back | Closed |
| Connection | Wired |
| Deviation From Target | 2.44 dB standard deviation |
| Driver Type | Dynamic |
| Drivers | 1 x 10mm dynamic |
| Form Factor | In-ear |
| Frequency Response | 10Hz - 20kHz (Manufacturer specified) |
| Harman Preference Score | 73 (measured by crinacle, via AutoEQ) |
| Impedance | 32 ohms |
| Sensitivity | 102 dB |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-1.1 dB at 30 Hz) |
| Tonal Tilt | +0.10 (negative is warmer, positive brighter) |
EQ preset to match the Harman target
Set a preamp of -4.2 dB, then add these filters in any parametric equalizer (Wavelet, Equalizer APO, Peace, or a player with parametric EQ). Calculated by AutoEQ from its measured frequency response.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +2.8 dB | 0.70 |
| Peak | 9,358 Hz | +4.2 dB | 2.59 |
| Peak | 149 Hz | -2.1 dB | 0.84 |
| Peak | 1,877 Hz | -3.4 dB | 2.54 |
| Peak | 3,450 Hz | +4.1 dB | 3.07 |
| High shelf | 10,000 Hz | -0.1 dB | 0.70 |
| Peak | 853 Hz | +1.7 dB | 1.24 |
| Peak | 5,343 Hz | -3.7 dB | 5.41 |
| Peak | 1,332 Hz | -1.5 dB | 2.76 |
| Peak | 6,775 Hz | +1.3 dB | 3.54 |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons