Headphones · Closed-back · Dynamic
Audio-Technica ATH-M40x
All Audio-Technica · 2014 · MSRP $109
The ATH-M40x is a closed-back dynamic wired monitor headphone from Audio-Technica with 40mm CCAW voice coil drivers. It features an ear cup that swivels for one-ear monitoring, a folding design, and two detachable cables (1.2m coiled and 3.0m straight).
Specifications
| Frequency response | 15 Hz – 24 kHz |
| Sensitivity | 98 dB/mW |
| Impedance | 35 Ω |
| Power handling | 1.6 W |
| Driver | 40 mm |
| Weight | 240 g |
As stated by the manufacturer — not community data.
Will it drive? · On paper
A dongle is enough
A phone's own output runs out early; a small USB DAC/amp gives it full level and headroom.
| Needs, for 110 dB peaks | 0.74 V · 16 mW |
| Phone or laptop (≈0.70 V, 20 mW) | Runs short |
| Dongle DAC/amp (≈2.0 V, 120 mW) | Enough |
Worked out from the stated 98 dB/mW and 35 Ω — not a listening test. DAC/amps on the shelf →
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