Does the Apple USB-C to 3.5mm drive the Audio-Technica ATH-R70x?

Computed from rated specifications · target SPL 110 dB · load 600 Ω

Insufficient

The Apple Apple USB-C to 3.5mm cannot drive the Audio-Technica ATH-R70x to target SPL (~-10.0 dB headroom at 600 ohms; needs ~15.8 mW, delivers 2 mW). (Amp power at 600 ohms is estimated from its published figure at a nearby load.)

Headroom
-10.0 dB
Required (110 dB SPL)
15.8 mW
Delivered (@ 600 Ω)
1 mW *est.
Required voltage
2.73 Vrms

Power Headroom

Headroom: -10.0 dB 0 · target -10.0 dB below target marginal adequate ample -14 dB +10 +20 +36 dB

Amp delivers 1 mW at 600 Ω — short of the 15.8 mW needed to reach 110 dB SPL (-10.0 dB). Scale: -14 dB to +36 dB. Power figure estimated from an adjacent published load.

Audio-Technica ATH-R70x Dynamic · over-ear
Impedance 470.0 Ω rated
Sensitivity 98.0 dB/mW rated
Driver Dynamic
Spec basis Rated
Rated: Audio-Technica official spec (470 Ω, 98 dB/mW at 1 kHz). RAA has no measurement page. · Source ↗
Apple USB-C to 3.5mm Dongle · Single Ended
Output impedance review-measured 1.0 Ω
Power @ 32 Ω 31 mW
Power @ 300 Ω 3 mW *est.
Power @ 600 Ω 1 mW *est.
Power source Review Measured low confidence
* Loads marked "est." are derived from the published voltage ceiling at a lower-impedance load (V = √(P·R) → P_higher = V²/R_higher). All derivations are upward only.
Apple does not publish power specs. Power (31 mW @ 32 Ω) from community measurements (Kinemoss Tech review 2025). Output impedance ~1 Ω from multiple independent measurements. Derives 300 Ω and 600 Ω from voltage ceiling. Replaces synthetic 'Generic USB-C dongle' fixture. · Source ↗
Specification confidence: low

One or more amp specifications (power output or output impedance) are estimated rather than published by the manufacturer. Treat this pairing's verdict as approximate.

Power figure note

The amp's power at 600 Ω was not published directly — it was derived from the voltage ceiling at a published lower-impedance load. The actual delivered power may differ modestly.

Where to buy

Apple USB-C to 3.5mm on Amazon ↗ Audio-Technica ATH-R70x on Amazon ↗

Disclosure: links above are Amazon affiliate links. As an Amazon Associate this site earns from qualifying purchases — at no extra cost to you. Affiliate commissions do not influence verdicts; all analysis is computed independently from the data.

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