TECHNICAL SPECIFICATIONS

Electrodynamic headphones
Frequency response: 10-20 000 hz
Unmeasurable distortion 100 db
Voice coil 25 mmm
2 potentiometers for channel power
Max power 100 w
Weight 620 grams

know that may have to replace hp coils
by those headphone Koss R80, same diameter
and even design, very similar characteristics