What type of connector do the Audio-Technica ATH-AD900X headphones use?

The Audio-Technica ATH-AD900X headphones use a 3.5mm (1/8") mini stereo connector, which is gold-plated.

What is the frequency response range of the Audio-Technica ATH-AD900X headphones?

The frequency response range of the Audio-Technica ATH-AD900X headphones is 5Hz to 35KHz.

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Audio-Technica ATH-AD900X Audiophile Open-Air Headphones

Audiophile-quality open-air headphones deliver clear, natural vocal and instrumental reproduction, a smooth tonal balance, precise imaging and superlative dynamic range
Large-aperture 53 mm drivers and CCAW voice coils for superior sound reproduction
No sense of pressure on the ears, resulting in a completely natural sensation
3D Wing Support Housing offers a vibration-proof mechanism that provides comfortable support for a better listening experience
Extremely comfortable ear-fitting pads