Short answer: the KZ ZNA. Both are rated 3.1/5 for sound quality (#1049 and #1059 of 1369 in-ear headphones), and the KZ ZNA costs $22 against $28 for the Sony IER-EX15C, with sound quality a draw, the lower price decides it.
The case for the KZ ZNA: About 4 dB more bass than the Harman target below 150 Hz, for listeners who want a fuller low end. The catch: An uneven response, 2.6 dB standard deviation from target.
What the Sony IER-EX15C does well: At 0 lbs (3 g) per earpiece it is very light, and the built-in microphone makes it handy for calls. The tradeoff: Sub-bass rolls off about 2.8 dB below target under 60 Hz, so deep synth bass and rumble are subdued.
Buy the KZ ZNA. Both are rated the same for sound quality, and it costs $6 less than the Sony IER-EX15C.
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About 4 dB more bass than the Harman target below 150 Hz, for listeners who want a fuller low end.
Linsoul $22 eBay
At 3 g per earpiece it is very light, and the built-in microphone makes it handy for calls.
Amazon $28.00 eBayPrices on this page were last checked October 17, 2026 at 6:04 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
| KZ ZNA | Sony IER-EX15C | |
|---|---|---|
| Price | $22 | $28.00 |
| Ranked | #1049 of 1369 in In-Ear Headphones | #1059 of 1369 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 63 (median of 8 squig.link measurements, calibrated to AutoEQ) | 62 (median of 2 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.65 dB standard deviation | 2.85 dB standard deviation |
| Tonal Tilt | -0.86 (negative is warmer, positive brighter) | -0.43 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+3.9 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-5.0 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Hybrid (1 DD + 1 BA) | - |
| Drivers | 1 x 12mm dual-cavity dynamic driver + 1 x 30095 balanced armature driver | 1 x 5mm |
| Impedance | 34 ohms | - |
| Sensitivity | 112 dB | - |
| Frequency Response | 20Hz - 40kHz | 20Hz - 20kHz (Manufacturer specified) |
| Weight | 0.1 lbs (59 g) (with cable) | 0 lbs (3 g) per earpiece |
| Built-in Microphone | - | Yes |
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