Does the Apple USB-C to 3.5mm drive the AKG K240 Studio?

Computed from rated specifications · target SPL 110 dB · load 32 Ω

Insufficient

The Apple Apple USB-C to 3.5mm cannot drive the AKG K240 Studio to target SPL (~-4.1 dB headroom at 32 ohms; needs ~79.4 mW, delivers 31 mW).

Headroom
-4.1 dB
Required (110 dB SPL)
79.4 mW
Delivered (@ 32 Ω)
31 mW
Required voltage
2.09 Vrms

Power Headroom

Headroom: -4.1 dB 0 · target -4.1 dB below target marginal adequate ample -14 dB +10 +20 +36 dB

Amp delivers 31 mW at 32 Ω — short of the 79.4 mW needed to reach 110 dB SPL (-4.1 dB). Scale: -14 dB to +36 dB.

AKG K240 Studio Dynamic · over-ear
Impedance 55.0 Ω rated
Sensitivity 91.0 dB/mW rated
Driver Dynamic
Spec basis Rated
Rated: AKG official spec (55 Ω, 91 dB/mW at 1 mW). Note: AKG uses dB/V for most models but explicitly states 1 mW here. RAA has no 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.

Where to buy

Apple USB-C to 3.5mm on Amazon ↗ AKG K240 Studio 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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Schiit Magni Heretic Ample 13.0 dB
Schiit Fulla 4 Marginal 2.8 dB
Little Dot MkII Marginal 1.0 dB

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HeadphoneHeadroom
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