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Black over-ear headphones with 40 mm drivers, swiveling earcups and a coiled cable

Audio-Technica

Audio-Technica ATH-M40x 40 mm headphone

SKU CH-3DJY-JS9KB MPN ATH-M40x

Closed-back monitor headphones with 40 mm drivers tuned flat from 15 Hz to 24 kHz for accurate studio tracking and mixing

  • Driver size40 mm
  • Frequency range15 Hz-24 kHz
  • Impedance35 ohms
  • Power supplyMaximum Input Power: 1,600 mW at 1 kHz
  • Audio sensitivity98 dB/mW
  • Connection3.5 mm
  • Flat response from 15 Hz to 24 kHz for accurate monitoring
  • 40 mm drivers with rare earth magnets and copper-clad aluminium voice coils
  • 98 dB/mW sensitivity delivers high output with low power
  • Circumaural design provides excellent sound isolation in loud environments
  • 90° swivelling earcups enable convenient one-ear monitoring

Professional monitoring headphones

The Audio-Technica ATH-M40x is a closed-back headphone built for studio tracking, mixing and DJ monitoring. Its 40 mm drivers use rare earth magnets and copper-clad aluminium wire voice coils to deliver a flat frequency response from 15 Hz to 24 kHz. The circumaural design contours around the ears to provide effective sound isolation in loud environments.

Passive isolation and efficient drive

With no active electronics the headphones add zero self-noise and draw no power from the source. Rated at 35 ohms impedance and 98 dB/mW sensitivity they reach high output levels from portable interfaces or studio consoles without strain. Maximum input power is 1600 mW at 1 kHz, giving ample headroom for transient peaks during monitoring sessions.

Swivel earcups and quarter-inch adapter

Each earcup rotates 90 degrees for convenient one-ear monitoring while recording or cueing. The bundle includes a protective carrying pouch and a screw-on 6.3 mm adapter so the fixed 3.5 mm plug fits professional audio gear without extra purchases. Weighing 240 g without cable the set remains comfortable during extended use.

How it compares

Measured against everything we stock in Earbuds & Over-Ear Headphones, at today’s prices. Recalculated every night.

Price $89.99
Pricier than about 83% of the 7,078 comparable items (median $25.99).

Specifications

Product
Brand nameAudio-Technica
Model nameATH-M40x
Part numberAUD ATHM40X
Product typeHeadphone
Product colorBlack
Audio & video
Driver size40 mm
Frequency range15 Hz-24 kHz
Impedance35 ohms
Audio sensitivity98 dB/mW
Wearing styleOver-ear
Noise cancellationSound isolation
Connectivity
Wireless technologyNo
Ports & slots
Connection3.5 mm
Power
Power supplyMaximum Input Power: 1,600 mW at 1 kHz
Size & build
Product weight240 g (8.5 oz), without cable and connector
Shipping weight1.36 kg
Package size432 × 356 × 127 mm
Compatibility
Compatible withStudio Equipment, DJ Equipment
In the box
In the boxAccessories Included
Protective carrying pouch, 6.3 mm (1/4 in) screw-on adapter

Questions about this item

How do I attach the 6.3 mm screw-on adapter to the 3.5 mm connector?

Screw the adapter clockwise onto the 3.5 mm plug until it seats firmly; the thread is fine, so cross-threading is the common mistake — start it straight and turn gently.

Which parts will wear out first and need replacement?

The professional-grade earpads and headband padding are the only consumable items; both are user-replaceable and available from Audio-Technica.

At what point does the 35 ohm impedance limit sustained high-volume use?

The 35 ohm load draws more current from portable sources, so battery-powered devices hit their voltage rail first and clip before the 1,600 mW driver limit is reached.

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