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Russound AB-3.2 Automatic Speaker Selector Provides automatic switching between two amplified audio sources

Item # 543AB32

Use this compact A/B selector to automatically switch power sources for a pair of speakers.

Use this compact A/B selector to automatically switch power sources for a pair of speakers.

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5 questions - 7 answers

Item # 543AB32

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About the Russound AB-3.2 Automatic Speaker Selector

Kramer Crane

A handy solution for your custom audio system 

Here's a cool little problem solver: say you have a pair of in-wall speakers in your living room that you use for music with your Russound or Sonos whole-house audio system. But you also want to use that same pair of speakers as the surround channels of your home theater. The Russound AB-3.2 automatic speaker selector intelligently switches between two amplifiers, allowing you to use a single pair of speakers in two different configurations.

Product highlights:

  • rack-mountable automatic A/B speaker selector
  • switch between two amplifiers playing through one pair of speakers
    • automatically switches to alternate amplifier input when signal is present
  • sensitivity and delay adjustments to fine-tune your installation
  • LED indicators for power and source status
  • handles up to 200 watts per channel with 8-ohm speakers (100 watts per channel with 4-ohm speakers)
  • 6-1/2"W x 2"H x 1-3/4"D (including connectors)
  • warranty: 2 years
  • MFR # 3699-520914

What's in the box:

  • A/B Selector
  • AC Power supply with attached 52" cable (Output: 12VDC / 300mA)
  • Instruction manual

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More details on the Russound AB-3.2 Automatic Speaker Selector

Research Team

Product Research


A/B Selector: The Russound AB-3.2 A/B Selector allows for automatic switching of two amplifier's outputs to a single pair of speakers. This lets you use one pair of speakers to play two different amplified sources without having to manually switch between them.

Connections: The AB-3.2 has three removable, connector blocks, accepting up to 14-gauge wire. These connectors use screw-down termminals to secure the speaker wire into place.

Automatic Selection: The A/B Selector's three connector blocks consist of two inputs, Amp A and Amp B (interrupting), along with a Speaker Output block. The Amp A input is "normalized" to the Output block, but when a signal is sensed on the Amp B input, the selector will switch to that input source. When the Amp B interrupting input is no longer active, the unit automatically switches back to the Amp A input. This can also be used in conjunction with a microphone to interrupt the sound source when a paging announcement is made. A green LED indicator lights when Amp B is active.

Trigger & Delay: The Amp B interrupting input includes sensitivity adjustment dials for both Trigger and Delay settings:

  • Trigger: This adjusts the volume level of the interrupting signal where switching occurs. Lower levels will decrease the Selector's sensitivity to incoming signals, while higher levels will let the Selector switch with very little signal present.
  • Delay: The Delay allows you to adjust how much "silence" can occur before the interrupting input switches off. This is handy for allowing dead space between CD tracks to pass without the Selector switching back to the Amp A input.


  • Power Handling:
    • 8Ω Speakers: Maximum 200W
    • 4Ω Speakers: Maximum 100W
  • Minimum Trigger Level: 15mV
  • Delay: 0 to 30 seconds
  • Power Supply: 12VDC / 300mA
  • Dimensions: Width - 6.50", Height - 2.0", Depth - 1.75" (incl. connectors)
  • Weight: 1.4 lbs.

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Customer Q&A

5 questions already asked

Can I use this AB switch between in-wall Volume Control and my Speakers? I'm setting it up as Amp A>Volume Control>Switch A> Speakers
spartan  Jun 10, 2023
1 answer
Greetings Jeremy, and thank you for your question. This switch is for using one pair of speakers that need to be connected to two amplifiers. Please contact one of our advisors at 800-324-9695 to see if this is the right device for your project.
hogan  Jun 10, 2023 (Staff)
Can I run 4 8ohm speakers off this switch or would that require 2 switches?
ryan  Jan 29, 2021
3 answers
The purpose of the switch is to prevent two amps from feeding the same speakers at the same time. It's either A or B. It the B line is hot it automatically shuts off the A input line. If you had three amps you could daisy-chain two switches to protect your speakers.
david  Jan 29, 2021
Yes. two 8 ohm speakers in parallel will behave like one 4 ohm speaker.
robert  Jan 29, 2021
Ryan, I actually used the switch to change from one receiver (newer) to another receiver (vintage) while sharing the same four speakers in an A/B or Main/Remote speaker setup. Given this, I had to use two switches. I had the old receiver "A" connectors wired to the Amp A input and the New Receiver "A" connectors wired to the Amp B input. The Speaker out is wired to my "A" or Main speakers. I did the same thing with the second switch with the "B" or remote connectors.
robert a  Jan 29, 2021
is there a unit like this for line level signals?
christopher  Aug 17, 2020
1 answer
We have not received any answers from other customers on your question. I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat. They should be able to help answer your question.
thomas  Aug 28, 2020 (Staff)
I see it states from Amp A and B. What if one of the input sources is not amplified? Will it auto switch?
craig  Feb 01, 2020
1 answer
Both A and B need to be amplified, the switch is triggered by speaker level connections from both A and B amps. Deanna H
deanna  Mar 08, 2020
Does the unit incorporate dummy load resistors for amplifier a when amp b is in use?
dpiddy  Oct 14, 2019
1 answer
I've read all the information we have on it including the manual. I cannot find any mention of load resistors for the A amp channels.
jason  Oct 29, 2019 (Staff)

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