Dual Source Power Amplifier: 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 Line 2 source.
This amplifier can be used for power upgrades in specific zones, for speaker
selector, or volume control systems.
Class A/B Design (Bridgeable): The Russound P75 is a Class A/B
amplifier 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 X75
is rated at 160 watts of power into a single 8-ohm load.
Dual Source w/ Auto-Switching: The P75 has dual source capability. If
two sources are used, connect the source you want to listen to most of the time
to the Line 2 (secondary) input and the source you listen to less constantly to
the Line 1 (primary) input Whenever the Line 1 (primary) source becomes active,
that signal will take priority over the distributed audio signal on the Line 2
(secondary) input. The signal remains active but not heard on the Line 2 input,
and once the Line 1 audio signal is muted or turned off , the P75 will
automatically switch back to the Line 2 (secondary) audio signal.
Front-Panel & Rear-Panel Controls: On the front-panel of the P75 are
Power, Speaker A/B, Volume, and Balance controls. On the rear-panel are
Stereo/Bridge, and Auto On/Manual controls.
- Power On/Off +Auto 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 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.
- Volume & Balance Controls: You can adjust the speaker output volume,
as well as adjust speaker output balance between right and left channels
- Speaker A/B Switch: You can 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.
- Stereo/Bridge (Mono) Modes: In Stereo mode the amplifier sends
separate power and audio signals to the left and right channels. In Bridge
(Mono) mode both the left and right channels are combined for a higher power
mono output; the minimum impedance for the total load connected to a pair of
channels in the bridged mode is 8-ohms.
Stereo RCA Inputs/Outputs: The Russound P75 amplifier features two
stereo analog RCA inputs (Line 1/Line 2) to connect up to two analog audio
devices. There is also a stereo analog RCA output to send the amplifier's Line 2
input to another zone amplifier.
Binding Post Speaker Terminals: The P75 amplifier is fitted with eight
binding post speaker terminals and can accommodate up to two pair of speakers.
You can power "A" speaker only, "B" speaker only, or both "A & B" speakers. When
driving a single pair of speakers the amplifier can handle 4-ohm speakers in
Stereo mode, or a single 8-ohm speaker in Mono mode. When driving both "A & B"
speakers the amplifier can handle a minimum of 8-ohm speakers. The binding post
terminals will accept bare wire (16-12AWG), pin-connectors, and banana plugs
(single or dual)
Unswitched AC Outlet: 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.
Protection Circuitry: The Russound P75 dual source power amplifier
employs protection circuitry to safeguard against short circuits and
- Short Circuit Protection: 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.
- Thermal Protection: The P75 amplifier 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 condition occurs, turn off the amplifier.
Mounting Options: The P75 amplifier can be placed on a shelf in an
equipment rack, or on a table or cabinet. Make sure there is enough clearance
around the amplifier for proper ventilation. The rear-panel should have
approximately 5.125" of clearance, while the front-panel should have about
2.4375" of clearance. Both side of the amplifier should have around 0.9375" of
clearance and the top should have 8.25" of clearance for proper ventilation.
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