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Russound P125

Stereo dual-source power amplifier

Item # 543P125

Maybe all you really need to power your multi-room system is a smartly automated amp like the Russound P125.

Maybe all you really need to power your multi-room system is a smartly automated amp like the Russound P125.

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About the Russound P125

David Brown

Power for speakers and automatic source switching

Today's networked audio players, music streaming services, and remote control apps for smartphones and tablets have radically changed the way we experience music at home. You still need good clean power to drive your speakers, but you probably don't need a traditional receiver with a lot of buttons to push. Maybe all you really need is a smartly automated amp like the Russound P125.

Power for speakers and automatic source switching

Today's networked audio players, music streaming services, and remote control apps for smartphones and tablets have radically changed the way we experience music at home. You still need good clean power to drive your speakers, but you probably don't need a traditional receiver with a lot of buttons to push. Maybe all you really need is a smartly automated amp like the Russound P125.

Connect one music component as your primary source, and it will activate the amplifier when it sends out an audio signal. The amplifier returns to standby mode when the audio signal ceases. Your secondary audio source takes over automatically when there's no signal coming from the primary source. There's no need to manually switch inputs.

Say you have a network audio player, such as a Sonos Port connected to the primary input. Any time you fire up the Port, your P125 turns itself on and feeds the music to your speakers. Because the P125 has two sets of speaker outputs, you could be listening in the den, the kitchen or wherever you chose to install your speakers. Because you control the Port with a smartphone app, it doesn't matter where you put it. The Port and the P125 could be out of sight in a utility closet or cabinet.

You might connect an old-school music source like a CD player to the secondary input, and enjoy it whenever you're not using your Sonos Port. When a CD stops playing, the P125 will automatically switch to standby mode.


Product highlights:

  • 80 watts per channel into 8 ohms (1,000 Hz) at 0.2% THD with 2 channels driven
  • 125 watts into 4 ohms
  • 250 watts when bridged into a single 8-ohm load
  • volume and balance controls
  • A/B speaker switching
  • primary and secondary audio line inputs with automatic source switching
  • selectable speaker-level input for upgrading power in an audio zone or for integrating a "local" source into a zone
  • loop output on the secondary line input passes that audio signal on to another amp, giving you flexibility in designing a multi-room system
  • 12-volt trigger input and output for sequenced activation of various components in your system
  • 16-5/8"W x 4-1/16"H x 15-13/16"D
  • 25.6 lbs.
  • warranty: 3 years
  • MFR # 2800-536274

What's in the box:

  • 2-Channel/2-Source amplifier
  • 6' AC power cord
  • Installation Manual

Customer reviews for Russound P125

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More details on the Russound P125

Stacey B.

Features & specs

Number of Channels 2
Power Output per Channel (8 ohms) 80
Power Output per Channel (6 ohms) ---
Power Output per Channel (4 ohms) 125
Frequency Bandwidth 1k
THD 0.2%
Minimum Impedance 4
Bridged Power per Channel 125 watts
Speaker Outputs 4
THX Certification No
Width (inches) 16-9/16
Height (inches) 4-1/16
Depth (inches) 15-13/16
Weight 25.6 pounds
Parts Warranty 3 Years
Labor Warranty 3 Years
Inputs & Outputs
Number of Inputs 3
Input Type RCA, Speaker-Level
Removable Power Cord IEC 2-prong
Level Controls Yes
Speaker Connectors Binding Post
The Russound P125 replaces these items:

Product Research


Dual Source Power Amplifier: The Russound P125 is a two-channel, dual source power amplifier with auto-source switching. It features Primary and Secondary audio line inputs with a loop out to another zone, receiver, or device from the secondary source. A speaker-level input can be connected and assigned as either the primary or secondary source. This amplifier can be used for power upgrades in zones for large speaker selector or volume control systems.

Stereo or Bridged Amplification: The P125 is rated at 125 watts per channel into 4-ohms, and 80 watts into 8-ohms. With the Stereo/Bridge Mono switch in the Bridge Mono position, both amplifier channels are combined for a higher powered mono output. In Bridge mode the P125 is rated at 250 watts of power into a single 8-ohm load.

Dual Source w/ Auto-Switching: The P125 has dual source capability. If two sources are used, connect the source you want to take temporary priority to the Primary input and the other constant source to the Secondary input. Whenever the primary source becomes active, that signal will take priority over the distributed audio signal on the secondary line. The signal is still active on the secondary line but will not be heard, and once the primary audio signal is muted or turned off the amplifier will automatically switch back to the secondary audio signal. You can adjust the delay time(3s-15s) to determine the length of time it takes to switch back to the secondary signal.

Front-Panel & Rear-Panel Controls: On the front-panel of the P125 are Power, Speaker A/B, Volume, and Tone controls. On the rear-panel are Stereo/Bridge, and Auto/Trigger/Normal controls.

  • Power On/Off +Auto On: The P125 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 in approximately 4 minutes. To turn the amplifier on remotely, set the switch to Trigger and connect a 3.5mm minijack cable from the device to the 12V Trigger In on the amplifier.
  • Volume, Level, & Tone Controls: You can adjust the speaker output volume, as well as adjust speaker output balance between right and left channels. You can also adjust the the level of the right and left channels independently.
  • 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 P125 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 P125 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).

Speaker Level Inputs: If you have a source that is only available as a speaker level signal, connect it to the Speaker Level Input terminals, using the binding post terminals and observing proper polarity. Only one set of speaker level inputs can be utilized and assigned by the selector switch. When using the Speaker Level Input, and it is switched to the Secondary position, the high-level signal will not pass to the Secondary Line RCA output.

12V Trigger Input/Output: The 12V Trigger In/Out allows the amplifier to be activated by other devices or to activate other electronics via a 3.5mm minijack cable, with 100mA current capability.

Protection Circuitry: The Russound P125 dual source power amplifier employs protection circuitry to safeguard against short circuits and over-heating.

  • 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 P125 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.

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Customer Q&A

5 questions already asked

Can you have both speakers (A & B) active at the same time?
chidu  Dec 15, 2020
3 answers
Just make sure the speakers are a minimum of 8 ohms and it will work as the others have indicated allowing you to run both A and B channels at the same time without hurting this amp
jason  Dec 31, 2020 (Staff)
Yes. We do exactly this in a winery where there are two different rooms we want to hear music in.
henry s.  Dec 29, 2020
I'm using it in bridge mode to power an outdoor sub. (300W) I also have the P75 which I run both A/B channels at the same time. So, I would guess that the P125 will also. I've just not tried to. Hope this helps!
christopher  Dec 29, 2020
How could I hook up an active subwoofer to this? If possible.
ryan  Oct 28, 2020
1 answer
This can be done, as long as you only use the second stereo input (labeled:Secondary Line). This second stereo input has both RCA inputs (Left+Right) and RCA outputs (Left+Right pass-through). You can connect those outputs to your active subwoofer. Because these outputs only pass-through the Secondary Line input, if you are using the Primary Line inputs, your active subwoofer will NOT work when that primary source is sending an audio signal into the amp. The active subwoofer (connected to the Secondary Line output) will only receive the audio of the secondary source. TLDR; as long as you only have one input source to amplify, as long as you use the Secondary Line input RCA jacks, you can connect the corresponding Secondary Line output RCA jacks to pass that audio signal through to your active subwoofer. It will work great!
henry s.  Nov 19, 2020
Is this able to power my two towers plus center channel ? Hooking it to a denon receiver
brian  Feb 10, 2019
2 answers
It should. Mine powers four towers hooked (with other external powered amplifiers, in a daisy chain) from an Onkyo intergrated amp.
jeffrey  Feb 10, 2019
It is a stereo amp. No center channel.
robert  Feb 10, 2019
is there a certain surge protectors i should buy for this amplifier?
mjleo  Mar 29, 2018
1 answer
A surge protector is a great solution to keep your stereo equipment protected, and we have several options available that'd work with the Russound P125. In order to find the best option suited to your system and/or budget, feel free to contact an Advisor directly by phone (888.955.6000) or online chat. They'll be happy to go over the different models to help you make the best decision. Thanks! :)
david  Apr 09, 2018 (Staff)

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