Pro-25 Headphones  (330-1022)      Specifications      Faxback Doc. # 16385

Frequency Response:.....................15-22,000 Hz measured with integral
                                        grillplate and cushion in place, on
                                             the Koss PC-100 Style Coupler.
Sensitivity:..........................97 dB SPL/1mW input 20-22,000 Hz pink
                                      noise signal, on coupler PC-100.  1mW
                                                 referenced to element DCR.
Distortion:......................................<0.2% at 100 dB SPL with a
                                                    1 KHz sinusoidal input.
DC Resistance:..............................................60 Ohms +/- 10%
Impedance:.........................................60 Ohms nominal, 95 Ohms
                                                           maximum at 60 Hz
Power Handling:...............................................100mW approx.
Diaphragm:......................35 mm diameter, 16um thick polyester with a
                             0.15% light transmissivity coating of titanium
                           proprietary Koss geometry imbossed in diaphragm.
Voice Coil:..........................................2 layer free standing,
                                                     O2 free Cu wire 46 AWG
Magnet Structure:....................Neodymium iron boron magnetic material
                                with high silicon steel formed pole pieces.
General:........................Integral acoustic damping molded into case.
                              Special element treatment to provide extended
                                                           mechanical life.
Cord Length:.................................8 1/2 ft. (3.5 mm stereo plug)
Weight:.....................................................104 g (3.66 oz)


(ALL-08/08/95)