Service manual

distortion. This makes for nice sounding current limit that allows for soft distorted peaks to get through but
limits continuous excessive current while maintaining thermal stability.
Speaker Output Terminal Strip
(240V version)
The screw terminals on the left hand side of the strip allow access to the direct speaker outputs of the
amplifier. Reading from left to right the terminals are:
COM Common or “-” for low impedance speaker loads (4 ohms)
4 Positive “+” for 4 ohm speaker loads (use with common)
8 Positive “+” for 8 ohm speaker loads (use with common)
COM Common or “-” for 70v or100v speaker loads (maximum load of 80 ohms at 100v)
70 Positive “+” for 70v line speaker loads (use with common)
100 Positive “+” for 100v line speaker loads (use with common)
Please ensure that the correct “Common” is used. Low impedance and 70/100v loads can be used
simultaneously but please pay careful attention to the overall speaker load.
Note: The minimum impedance (or maximum load) at 100 volt line should be no less than 80 Ohms.
(115V version)
The screw terminals on the left hand side of the strip allow access to the direct speaker outputs of the
amplifier. Reading from left to right the terminals are:
COM Common or “-” for low impedance speaker loads (4 ohms).
4 Positive “+” for 4 ohm speaker loads (use with common)
8 Positive “+” for 8 ohm speaker loads (use with common)
COM Common or “-” for 25v or 70v speaker loads (maximum load of 40 ohms at 70v)
25 Positive “+” for 25v line speaker loads (use with common)
70 Positive “+” for 70v line speaker loads (use with common)
Please ensure that the correct “Common” is used. Low impedance and 25/70v loads can be used
simultaneously but please pay careful attention to the overall speaker load.
Note: The minimum impedance (or maximum load) at 70 volt line should be no less than 40.
Terminal Strip
The remaining terminals read as:
[600 Ohm Telephone Input] (115V version)
Vox Relay Out
VCA
24 volt DC
Tone Generator Common (use with one of the 4 tones listed below)
Pre-Announce Chime
Alert Tone
Bell Chime
Evacuation Tone
Line Output