Short answer: the Technics EAH-AZ70W. It ranks #714 of 1291 in-ear headphones by sound quality, rated 3.6/5, at $137.57; the Acoustune Monitor RS ONE ranks #844, rated 3.5/5, and costs $139.29, so there is not much of a tradeoff to weigh.
What the Technics EAH-AZ70W does well: Crinacle’s measurement gives it a solid Harman preference score of 69 with a 2.60 dB spread. The catch: Its 2.60 dB spread is less even than the best measured sets.
Why pick the Acoustune Monitor RS ONE: A broadly balanced tuning with a preference score of 67 against the Harman target. Watch for: Treble about 3 dB above target from 3 to 10 kHz, which can sound sharp or tiring at higher volume.
Buy the Technics EAH-AZ70W. It is rated higher for sound quality than the Acoustune Monitor RS ONE 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.
Crinacle’s measurement gives it a solid Harman preference score of 69 with a 2.60 dB spread.
Amazon $137.57 eBay
A broadly balanced tuning with a preference score of 67 against the Harman target.
Amazon $139.29 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
| Technics EAH-AZ70W | Acoustune Monitor RS ONE | |
|---|---|---|
| Price | $137.57 | $139.29 |
| Ranked | #714 of 1291 in In-Ear Headphones | #844 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Connection | True wireless | Wired (3.5mm) |
| Driver Type | Dynamic | Dynamic |
| Drivers | 1 x 10mm dynamic | 1 Dynamic (9.2mm Myrinx EL) |
| Frequency Response | 20Hz - 20kHz | - |
| Weight | 0 lbs (7g) per earbud | - |
| Harman Preference Score | 69 (measured by crinacle, via AutoEQ) | 67 (median of 4 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.60 dB standard deviation | 2.46 dB standard deviation |
| Tonal Tilt | +0.01 (negative is warmer, positive brighter) | -0.33 (negative is warmer, positive brighter) |
| Back | - | Closed |
| Sub-bass Extension | - | Within 6 dB of target down to 20 Hz (+0.8 dB at 30 Hz) |
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