The AIAIAI TMA-2 S05 MKII Speaker (Detailed) contains a diaphragm that is precision-grown from NAC Audio bio-cellulose. This results in a speaker that is lighter & stiffer than standard headphone units. This helps the diaphragm to vibrate whilst keeping distortion at a minimum. Each of these qualities results in more accurate & detailed sound from the speaker with the ability to retain clarity of sound at high volumes. For better dynamics & defined high-frequency detail add the S05 speaker units to your TMA-2 headphones.