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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 X125.

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 ZonePlayer 90 connected to the primary input. Any time you fire up the ZonePlayer, your X125 turns itself on and feeds the music to your speakers. Because the X125 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 ZonePlayer with a wireless controller or smartphone app, it doesn't matter where you put it. The ZonePlayer and the X125 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 ZonePlayer. When a CD stops playing, the X125 will automatically switch to standby mode.

Product Highlights:

  • 80 watts per channel into 8 ohms or 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
  • 16-1/2"W x 4-1/16"H x 15-1/2"D
  • 25.6 lbs.
  • warranty: 2 years
  • Our 60-day money-back guarantee

Russound X125 Reviews

Average Customer Review:

1 Review

Russound X125

Written by: Lou from Fort Worth Tx on September 8, 2013

Crutchfield Customer Review (What's this?)

The amplifier has plenty of power for my patio application. I was pleased at how it drives a pair of Defnitive AW6500 speakers. I purchased this unit to place in my wiring distribution closet. What attracted me to this model was that it would be in standby mode until it received an audio or line level signal on either the RCA or speaker inputs. Unfortunately, the input sensing circuitry did not work with the RCA inputs. I contacted Crutchfield's Technical Support and we went over the settings. All was set up the way it should be. While my review is 2 stars for the Amplifier, I will give the Crutchfield support staff 5 stars for taking care of my problem and sending me a replacement. I tested my setup on a weekend and then called Technical Support when things did not work. Even though it was during a weekend, the folks at Crutchfield took care of me by shipping me a replacement. I will post a follow-up on the replacement amplifier to see if the auto-sensing circuitry works as designed.

Pros: Good power and low THD <0.02 %. Clean sound, good quality craftsmanship.

Cons: Auto-sensing circuitry did not work on first unit. Expecting a replacement and will test and post followup.

Hands-on research

What's in the box?

Download owner's manual

  • Two-channel amplifier
  • 6' AC power cord (IEC 3-prong)
  • Installation Manual

Product Research


Overview: The Russound X125 is a dual source 2-channel power amplifier. The X125 features volume and balance controls, as well as A/B speaker switching on the front panel.

Power Output: The X125 is a Class D amplifier rated at 125 watts per channel into 4 ohms, and 80 watts per channel into 8 ohms. Both amplifier channels can be bridged for a higher power mono output of 250 watts into a single 8 ohm load (The Stereo/Bridge switch on the back panel should be in the Bridge Mono position when bridging.)

Signal Sensing Inputs: The X125 can be turned on manually or automatically by setting a switch on the rear panel. For manual power, the front panel power switch turns the unit on or off. When set to automatic, the unit will power on when music is sensed on either RCA input connector. Once the signal is no longer detected, the unit will automatically shut off. The signal sensing feature also allows you to switch from one input source to another by turning one of the connected components on or off. Signal sensing inputs allow the amplifier to easily integrate with multi-room audio systems and home theater components.

Line Level Output: In addition to the line level inputs, the X125 has a stereo RCA line level output. This output allows you to send the audio of the selected source to another amplifier.

Speaker Level Signal Inputs: If you have a source that is only available as a speaker level signal, you can connect it to the amplifier via the spring clip input terminals on the back panel. Only one set of speaker level inputs can be utilized and assigned by the selector switch. You can set the speaker level input as the primary or secondary signal.

12V Trigger: On the back panel, there two 3.5mm minijacks for a 12-volt trigger input and a 12-volt (100mA) trigger output. These allow the amplifier to be activated by, or to activate, other devices with a mini-plug cable. The trigger delay can be set between 3 and 15 seconds.

Thermal Protection: The amplifier is designed with a special circuitry that protects the unit under a thermal overload condition. Thermal protection mode will only engage when the unit has been run at high volume for extended periods without adequate ventilation and/or when speaker impedances are below the minimum levels. For proper ventilation, it is recommended that the amp have a minimum of 2" of clearance around each side of the unit.

Short Circuit Protection: In addition to thermal protection, the X125 also has special circuitry to protect the amplifier from short-circuit conditions. This can be caused by a faulty speaker or when speaker wires come in contact with each other. When this condition occurs, the amplifier will shut down until the short circuit is corrected.

Our Product Research Team

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