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Russound SDB-2.1

2-pair speaker and source selector with volume control

7 Reviews | 1 question - 1 answer


Our take on the Russound SDB-2.1

You want to crank the tunes up on the patio where the party's going strong, but not in the kitchen where the cook likes the music softer. Now you can make everybody happy. The Russound SDB-2.1 gives you flexible speaker-switching options for multi-room applications. It allows you to connect two pairs of speakers and play them all simultaneously without damaging your equipment. Impedance-matching protection circuitry ensures that your amplifier or receiver operates at a safe load. This selector even lets you connect two source amplifiers and switch between them. So the patio crowd can keep stoking the salsa music, while the kitchen patrol chills to something old-school.

This product works just as described. I am able to switch between both receivers and both sets of speakers in the same room.

Anonymous, San Diego

What's in the Box:

  • Dual source two speaker selector
  • Installation Manual
  • Sheet of 52 room labels and 8 blanks

Product Highlights:

  • play 2 pairs of speakers simultaneously
  • 11-step volume control, 42dB maximum attenuation
  • allows switching between two source amplifiers
  • impedance-matching protection circuitry ensures that your amplifier or receiver operates at a safe load
  • handles up to 100 watts per channel
  • accepts up to 12-gauge speaker wire
  • includes room/speaker labels
  • 8-1/2"W x 3"H x 7-7/16"D
  • warranty: 10 years
  • Our 60-day money-back guarantee

Russound SDB-2.1 Reviews

Average Customer Review(s):

(7 Reviews)

Russound SDB-2.1

Anonymous from San Diego on 4/12/2017

Crutchfield Customer Review (What's this?)

This product works just as described. I am able to switch between both receivers and both sets of speakers in the same room.



Se ve bien

Enrique from San Juan, PR on 2/19/2017

Crutchfield Customer Review (What's this?)

Buen producto, construcción sólida. Good product, solid construction.

Pros: Fuerte construcción. Strong construction.

Cons: Delay o atraso al reproduir audio. Delay, delays to produce audio.

Crutchfield response on February 28, 2017 Translation provided by Crutchfield's International Sales & Support team.

Russound SDB-2.1

riverrunner from alabama on 10/30/2016

Crutchfield Customer Review (What's this?)

works great!! highly recommend if you need this application.

Pros: worked as advertised


Great Service-Great Product

Dave S from Reno, NV on 8/16/2016

Crutchfield Customer Review (What's this?)

Great product and as always great service had a problem after install and it was very easy to get someone on the phone. Product worked as adelveritsee and was a great value.



clean sound

Donald J from Santa Cruz, CA on 7/15/2016

Crutchfield Customer Review (What's this?)

This product works very well. It was not clear in the instructions how to set up the units impedance, but a call to Crutchfield support cleared it up. Sound quality is excellent and it gives me the volume control I was looking for.

Pros: Works nicely. I do not get static or pops while adjusting volume or turing speakers on or off. There is no apparent loss of quality of sound while using the unit.

Cons: Setting speaker impedance requires removing the cover and changing internal pins. A table is provided to tell you which pin setting to use, but it is not clear what you do when you get a different requirement while both speakers are playing verses one of the speakers. It would be nice if the unit accepted banana plugs.

very nice item

JoeP from New Jersey on 8/11/2015

Crutchfield Customer Review (What's this?)

This is a very sturdy piece of equipment with an all-metal housing that would fit in well with any higher end components. The modular connectors accept multiple wire gauges and make diagnosing any wiring issues a snap. I would have preferred soft-touch infinitely adjustable volume knobs rather than the stepped detents, but that's a minor issue easily compensated for by fine-tuning the master amp volume. I'm using it for living room speakers and deck speakers, where the impedance and speaker wire gauges are different and it works great.

Pros: Sturdy design, modular connectors

Cons: A bit pricey, but you get what you pay for.

Gets the job done.

PManz from Abington, PA on 6/28/2013

Crutchfield Customer Review (What's this?)

Overall, it was a great product to synchronize the built-in speakers between our kitchen and outdoor speakers on our patio. Gives us seamless music at parties. I will agree with a previous review that the stepped volume is a bit odd. It's the only reason I gave it 4 stars. Also, very reasonable price considering your other options.

Pros: Gets the job done. Easy to install.

Cons: Stepped Volume


Hands-on research

Product Research


Overview: The Russound SDB-2.1 is a dual source speaker selector that allows you to control two pairs of speakers. The front panel has separate volume controls for each speaker pair so you can adjust the volume in each room from one convenient location. At each volume control, you can turn each pair of speakers on or off, and select amplifier A or B using the two 2-position push-buttons on the front panel.

Ultra-Match Technology: The SDB-2.1 uses high quality impedance matching autoformers that distribute maximum power throughout the system while maintaining a safe operating load at the amplifier. You can use the speaker selector with 4- or 8-ohm speakers. Internal jumpers allow you to select the degree of impedance matching for your speakers and amplifier.

Note: The unit is set at the factory at 2x, which is proper for most applications. If certain applications require changing the impedance setting, you will need to remove the cover and reposition the jumper on the autoformers.

Volume Controls: The SDB-2.1 has two rotary volume controls with 11 steps of volume, plus an off position. The volume control provides a total of 42 dB attenuation.

Connections: The speaker selector features four 4-pole screw terminal blocks, two for the inputs from the amplifiers, and two for the outputs to the two speaker pairs. The terminals allow you to connect up to 12-gauge speaker wire. The terminals can be unplugged from the volume control for easier wiring.

Room Labels: The SDB-2.1 comes with a sheet of non-adhesive room labels which slide into a groove in the front panel. A total of 52 labels and 8 blanks are included.

Performance: The unit will accept up to 100 watts RMS per channel (300 watts peak).

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

reviews were positive and meets my needs [ KENNETH L  Mar 30, 2017 ]
Need to source control two audio systems to both indoor and outdoor speakers. This should meet my needs. Had good reviews. [ Carl  May 07, 2016 ]
Referred to this product , that fit my needs fully and was better priced, by Crutchfield Technician instead of a higher costing item that did more than what I needed. [ Jackie  May 06, 2016 ]

1 question already asked


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The Russound SDB-4.1 offers these features:

11-step impedance matching volume control for four pairs of speakers

handles 200 watts per channel

switch between two powered sources, like an amplifier and receiver

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