Features:
Vented diaphragm
Non Resonant air chamber
UHPLC copper voice coil wire
Standard copper connecting cord

Tranducer type
dynamic
Operating principle open air
Frequency response 20-22
SPL 1mV 98
Normal impedance 32ohms
Driver matched db .05

Features are the same as the SR125 but, this Headphone has an increased air flow by 50% which is achieved through an improved rear metal screen and closer matched drivers. The result is an enlarged soundstage achieved from closer driver tolerances, while the improved rear screen frees the headphone from colorations