PA 225 / 250 (T)
PA 425 / 450 (T)
two/four channel power amplifier
IRP professional sound products L.P.
1 E. Beacon Light Lane
Chester, PA 19013, USA
phone 610-874-5663
Amplifier PA-425 / PA-450
Control Elements and Indicators
1
7 9 7
3
8 8 6
5 8 8
2
7 9 7
4
1
2
1 - level control for channel 1 and for bridge mode
2 - level control for channel 2
3 - level control for channel 3
4 - level control for channel 4 and for bridge mode
5 - switch for two-channel or bridge mode for channel 1 and 2
6 - switch for two-channel or bridge mode for channel 3 and 4
7 - overload indicator - red LED
8 - connected audio signal - green LED
9 - power indicator – green LED
Level Control
The audio level can be controlled for all channels individually. Using two amplifier blocks in bridge mode, only
the level control for channel one is active.
The potentiometers are flat bushing mount potentiometers. As an option the amplifier can be ordered with
potentiometers with knobs.
Bridge Mode
If the Bridge Mode switch is set to BRIDGE, the amplifier will deliver the following power:
PA-425
2x 50 Watts
at 8 Ohms
PA-450
2x 100 Watt
at 8 Ohms
CLIP Indicator
If the audio signal is too high, the red CLIP LED will lit up.
SIGNAL Indicator
The SIGNAL LED indicates, that audio signal is connected to the amplifier’s input.
