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
Getting Started
Unpacking
Upon unpacking, please inspect the amplifier. If you find any damage, notify your supplier immediately. Be sure
to save the carton and all packing materials in case you have to send the product to the supplier. Please use
only the original factory packing. If the shipment carton is unavailable, contact IRP professional sound products
L.P. to obtain a replacement.
Installation
The amplifiers will mount in standard 19-inch racks having sufficient depth. The height of the amplifier is one
rack unit (RU). Please keep attention that enough cooling is provided. The amplifier has no internal active
cooling system (fan etc.). The cooling provided by the heat sink of the amplifier is sufficient, if the amplifier is
installed in a vented rack.
Power Connection
The power amplifier must be connected only with the attached three-wire safety power cord with protective
conductor (non-fused earthed conductor).
This amplifier is made for use with the mains voltage labeled on the back of the amplifier only. Check the label
on the back panel of the amplifier for the appropriate voltage. Make sure the voltage of your mains outlet is
correct.
The power voltage is factory set as labeled on the back panel and can be changed by switching the main
voltage on the back site of the amplifier and changing the fuses as labeled. Damage caused by connecting the
amplifier to improper AC voltage voids the warranty.
Always turn off and disconnect the amplifier from the mains voltage before making any audio connections. As a
precaution, turn the audio attenuators on the front panel down during powering up.
The power fuses are located on the back panel of the amplifier and can be accessed from the outside. Use only
the appropriate fuses as labeled.
After properly mounting and connecting the AC cord and the audio connections, the unit can be switched on.
