Audio-Technica ATH-M40x vs Audio-Technica ATH-M20x

The Audio-Technica ATH-M40x, while similar in appearance to the Audio-Technica ATH-M20x, have a better overall build quality without exposed wiring on the headphones. They have more room to accommodate ears. They fit with better stability than the ATH-M20x. In the upper bass frequencies, the ATH-M20x provide a more accurate bass response, while the ATH-M40x have a greater lower frequency extension with more thump in your audio. In contrast, the treble range sounds more accurate on the ATH-M40x. The ATH-M40x also have two detachable cables and a pouch, while the ATH-M20x retains a single hardwired cable.