CONTRACTOR PRECISION SERIES
Owner‘s Manual 11
70 V Mode
The 70 V mode allows connection of 70 V loudspeaker lines (Direct Drive) in high impedance mode (HZ) without using output
transformers. In this case the maximum number of loudspeakers connected to an output channel is only limited by the
amplifier‘s output power (500 W for CPS4.5/8.5 or 1000 W for CPS4.10). This mode should be used if the distance between
amplifier and speaker is larger than 50 metres (approx. 150 feet) and/or a high number of small speakers (e.g. ceiling
speakers) is used.
100 V Mode
The 100 V mode allows connection of 100 V loudspeaker lines (Direct Drive) in high impedance mode (HZ) without using
output transformers. In this case the maximum number of loudspeakers connected to an output channel is only limited by the
amplifier‘s output power (500 W for CPS4.5/8.5 or 1000 W for CPS4.10). This mode should be used if the distance between
amplifier and speaker is larger than 50 metres (approx. 150 feet) and/or a high number of small speakers (e.g. ceiling
speakers) is used.
2.8 Power on delay
The ON DELAYswitch at the amplifier rear panel allows selecting the power on delay time. Following table shows possible
switch settings and corresponding delay times in seconds.
Illustration 2.6: CH 1 in 70 V mode
Illustration 2.7: CH 1 in 100 V mode
ON DELAY
Delay time
ON DELAY
Delay time
ON DELAY
Delay time
0
0
6
0.9
C
1.8
1
0.15
7
1.05
D
1.95
2
0.3
8
1.2
E
2.1
3
0.45
9
1.35
F
2.25
4
0.6
A
1.5
5
0.75
B
1.65
CAUTION: The setting of ON DELAY is ignored if a Remote Control Module is assembled.
preliminary
