Specifications:
Primary:
10 W-1.2 kOhm
5 W-2.4 kOhm
2.5 W-4.5 kOhm
1.25 W-10 kOhm
0.625 W-16.6 kOhm

Secundary:
4 : 8 : 16 Ohm

Frequency range: 50 – 19 kHz (-3dB)