Specifications:
1) Applicable horns: TH-16, TH-18, TH-20, TH-22, SH-380
2) Rated input:
a) SDU-75: 75W
b) SDU-50: 50W
3) Rated impedance: 16 Ohms
4) Sound pressure level: 110dB (1W/M) (when operated with TH-20 standard
horn)
5) Frequency response: 180 - 6000Hz (when operated with TH-20 standard
horn)
6) Horn coupling: 1-3/8 18 threads (inch screw)
7) Polarity:
a) Hot: +
b) Com: -
8) Operating temperature: -20 ~ 55oC (must be free from dew condensation)
9) Finish:
a) Flange and rear cover: aluminum or black coated
b) Screws: stainless steel
10) Dimensions (D x D):
a) SDU-75: 125 x 100mm
b) SDU-50: 114 x 95mm
11) Weight:
a) SDU-75: 2.4kg
b) SDU-50: 2.1kg

Note:
1) When the driver unit cannot be mounted on the TH-16 or TH-20 speaker
horn, first remove a horn coupler, then attach the driver to the removed
coupler and reinstall the coupler assembly in the horn
2) Speaker cable connection: remove cable connectors from the TH-16 or TH-20
cover, and connect the drivers speaker cables to horn cables of the same
color