Russound P75 Owner's Manual

The Russound P75 is a 2-channel dual source power amplifier with auto-

source switching. It features two audio line inputs with a loop out to another 
zone, receiver, or device from the Line 2 source.  

The P75 amplifier is rated at 75 watts per channel into 4 ohms, and 60 watts 

into 8 ohms. With the Stereo/Bridge Mono switch in Bridge Mono position, 
both amplifier channels are combined for a higher powered mono output. In 
Bridge mode the P75 is rated at 160 watts of power into a single 8 ohm load. 
Each amplifier output channel incorporates robust protection circuitry for 
reliability and safety.   

P75 amplifiers is designed with special circuitry to safeguard the amplifier 

under a thermal overload condition. Thermal protection mode will only engage 
when the unit has been run at high volume for extended periods of time 
without adequate ventilation and/or when speaker impedances are below the 
minimum levels for the amplifier. In thermal protection mode the amplifier will 
automatically stop output. If this fault occurs, turn off the amplifier, and check 
that the speaker impedance rating is above the minimum rating. Also check for 
adequate ventilation around the amplifier and make adjustments if necessary. 
Once the unit has cooled to safe operating temperatures, the amplifier may be 
powered back on.

Special circuitry has been designed into the amplifier to safeguard under a 

short-circuit condition. A faulty speaker can also cause a short circuit condition.  
If this fault condition occurs, turn off the amplifier and check speakers for short 
circuit conditions when appropriate.

The P75 amplifier can be placed on a shelf in an equipment rack, or on a table 

or cabinet. Be sure to follow the required clearances shown on page 3 to allow 
for ventilation and heat dissipation. 

On the front panel of the P75 amplifier are the power button plus speaker 

selector, a master balance and a master volume adjustment. 

Power - the front panel switch will manually switch the power on or off.

Power LED indicator - RED = ON, AMBER = Standby,  

No Light = Protection Mode

Speaker selector - select speaker pair A (main) or speaker pair B (auxiliary) for 

audio output. You can use speakers A and B together, as long as the speakers 
are at a minimum 8-ohm impedance.

Balance - adjust speaker output balance between right and left channels. The 

default setting is at center.

Volume - adjust the speaker output volume. If using Bridged mode, set the 

volume at minimum, then adjust to the desired level.

The P75 amplifier has a built-in outlet on the back panel. This 120 VAC outlet 

provides 400W unswitched power for a device such as a small powered 
subwoofer. This switch provides power as long as the P75 is plugged into an 
outlet, whether or not the unit itself is powered on.  

The P75 amplifier can be turned on manually or automatically by setting a 

switch on the back panel. For manual power on or off, press the Power button 
on the front panel. For automatic power on, set the rear switch to Auto On, and 
place the front panel power button in the "On" position. When music is sensed 
on either input RCA connector, the amplifier's signal sensing sends a command 
for it to power on. Once the signal ends, the amplifier turns off.   

When connecting speakers to the P75 amplifier, use a minimum 16 gauge and 

maximum 12 gauge stranded copper cable. Avoid leaving stray strands and 
keep polarity consistent.