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The Audio Technica ATH-M40X is a Professional Monitor Headphone. The M-Series ATH-M40x professional monitor headphones are tuned flat for incredibly accurate audio monitoring across an extended frequency range. Your studio experience is enhanced with superior sound isolation and swiveling earcups for convenient one-ear monitoring. Engineered with pro-grade materials and robust construction, the M40x excels in professional studio tracking and mixing, as well as DJ monitoring. Critically acclaimed M-Series professional monitor headphones deliver accurate audio and outstanding comfort, perfect for long sessions in the studio and on the go. Contoured earcups seal tight for excellent sound isolation, with minimal bleed. And the pro-grade materials are durable, yet comfortable. Find out why online reviewers, top audio engineers, and cult followers agree, that M-Series is an unmatched combination of audio and build quality that gets the job done. Hour after hour, year after year.
Product Specifications:
Type: Closed-back dynamic
Driver Diameter: 40 mm
Frequency Response: 15 - 24,000 Hz
Maximum Input Power: 1,600 mW at 1 kHz
Sensitivity: 98 dB
Impedance: 35 ohms
Weight: 240 g (8.5 oz), without cable and connector
Cable: Includes two interchangeable cables: detachable 1.2 m - 3.0 m (3.9' - 9.8') coiled cable and detachable 3.0 m (9.8') straight cable
Cable - Detachable: Yes
Magnet: Neodymium
Voice Coil: CCAW (Copper-clad aluminum wire)
Folding/collapsible: Yes
Accessories Included: Protective carrying pouch, 6.3 mm (1/4") screw-on adapter
The Audio-Technica ATH-M40x sits comfortably in the pro monitor sweet spot—closed-back reliability for mixing and critical listening, a step below the flagship M50x but with tighter bass and less hype. At USD109, this listing hits the 25th percentile of recent comparable used sales (median USD184, spanning USD109–369), making it a solid bargain for a well-kept pair in unknown condition—grab it if the photos check out.
Buyers, inspect the earpads and headband for cracking or foam collapse, common after heavy use; these fail faster than the drivers. Verify original cabling (detachable straight and coiled options) and pouch are included, and test for channel imbalance or stiff pivots, which signal age-related wear. Ping the seller for usage history to dodge hidden pad rot.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Founded in 1962 in Tokyo's Shinjuku district by Hideo Matsushita, Audio-Technica began as a phonograph cartridge specialist, launching the innovative AT-1 moving-magnet model with a diamond-tipped cantilever that revolutionized affordable high-fidelity playback. Starting with just three employees in a rented house and one million yen in capital, the company quickly expanded, supplying cartridges to Japanese audio manufacturers and relocating as demand surged. This heritage of precision engineering and democratic access to superior sound defines its enduring Japanese craftsmanship.
Audio-Technica has broadened far beyond cartridges into a comprehensive lineup of hi-fi essentials, excelling in headphones, professional microphones, turntables, and phonographic styli. While not heavily focused on amplifiers, speakers, or DACs, it produces elite receivers, wireless systems, and cables, alongside OEM transducers and sensors for pro audio. Its turntables and headphones span entry-level to audiophile grades, with Bluetooth and noise-cancelling models bridging consumer and studio needs.
Renowned for delivering exceptional value through durable, innovative design, Audio-Technica occupies a solid mid-tier position in the hi-fi market, prized by enthusiasts for reliability without extravagant pricing. It garners consistent awards for performance and builds trust via Olympic-grade microphones and global subsidiaries, appealing to discerning buyers seeking proven engineering over boutique exclusivity.
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