Our overall take, at a glance
AI-generated from the cited sources — may be incomplete or inaccurate; verify important details before deciding · generated Jun 2026.
The Audio-Technica ATH-M40x is an over-ear, dynamic closed-back headphone designed primarily for studio monitoring and audio production. Introduced as part of a remastered M-Series lineup in 2014, it features 40mm drivers with neodymium magnets and copper-clad aluminum voice coils. Operating with a 35-ohm impedance and a frequency response of 15 to 24,000 Hz, it is tuned to provide a flatter, more accurate sound profile with minimal coloration.
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Weight, side by side
Marshall Monitor III ANC is 10 g (4%) heavier than Audio-Technica ATH-M40x.
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The full spec sheet, side by side