Skip Navigation

Russound SDB-2.1

2-pair speaker and source selector with volume control

13 Reviews | 2 questions - 3 answers

California customers: Please click here for your Proposition 65 warning.

Item # 543SDB21

In Stock

 Ships FREE

Add to Cart

Ask an expert

Our VA-based experts can help.




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.

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

What's in the Box:

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

Has been working for 3 months without any problems. My ear can't hear any difference using NAD 2200 AMP/1240 PreAmp to B&W speakers. Nice construction, except the connection blocks are a little difficult to use, but seem to get the job done.

Cartouche, San Diego, CA


Russound SDB-2.1 Reviews

Average Customer Review(s):

(13 Reviews)

Good gear

Whit from Bellows Falls, VT on 5/31/2018

Crutchfield Customer Review (What's this?)

Works as advertised. Agree with another's comment that it would be a plus if this took banana plugs. But the connectors work well, especially compared to another, cheaper brand I got from elsewhere, and had to return because there was no way to use 14 gauge wire with it without risk of shorting. Also, the branding on this is refined. As for the fidelity, there's no compromise from the amplifier's output.

Pros: Good connectors. Transparent to the signal.

Cons: No banana plugs.

Great sound quality

Ed from Torrance, CA on 5/31/2018

Crutchfield Customer Review (What's this?)

The Russound SDB 2-1 was the perfect solution for my house. I had a Sonos amp that can only connect one pair is speakers. The SDB 2-1 allowed me to add a second pair of speakers without any loss of quality. The SDB 1-2 is saved me from having to purchase another Sonos amp, while maintaining sound quality.

Pros: Allows to add speakers to an amp Ability to have 2 speaker zones Quality construction

Cons: It was back ordered for 2+ Weeks

Works perfectly!

Sam from Apple Valley, CA on 3/30/2018

Crutchfield Customer Review (What's this?)

I have a Bose 4 speaker amp. I needed to be able to to control the speakers I have in front of the house separately than the speakers in the rear of the house. I was able to find a response from a Bose Tech stating that this item would work just fine. Installation was simple, and it does exactly what I purchased it for.

Pros: Great price from Crutchfield!

Cons: None so far.

Russound SDB-2.1

Crutchfield customer from Northfield, VT on 2/11/2018

Crutchfield Customer Review (What's this?)

Works as described and easy to install



Russound SDB-2.1

Crutchfield customer from Chino, CA on 2/9/2018

Crutchfield Customer Review (What's this?)

Great after see my sons I had to get one, works great.




Cartouche from San Diego, CA on 11/28/2017

Crutchfield Customer Review (What's this?)

Has been working for 3 months without any problems. My ear can't hear any difference using NAD 2200 AMP/1240 PreAmp to B&W speakers. Nice construction, except the connection blocks are a little difficult to use, but seem to get the job done.

Pros: Recommended by repair shop.

Cons: Perhaps a little pricey. Connection blocks. I don't see stepped volume control as much of a negative.

Russound SDB-2.1

Crutchfield customer 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 2/28/2017 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?

Have two sets of speakers. Wish this had banana plugs as connectors. [ L  Sep 17, 2018 ]
To add speakers [ Jeffrey  Jun 30, 2018 ]
I think it will do what I need it to do. [ Richard  Apr 10, 2018 ]
Split between systems in the house and the garage. [ Stan  Jun 04, 2017 ]
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 ]

2 questions already asked

I have an Onkyo two channel 85 watt unit in my bedroom for music primarily but also use it for movies. Have a Outlaw Audio sub hooked to the unit and as my main speakers I have a set of older Paradigm 11 towers. The SDB-2.1 is hooked to the receiver via the B speaker output to the input of the SDB-2.1 So I have a Speaker Craft dual pole speaker in the ceiling of my master bathroom, and a set of Paradigm smaller studio monitors on the night stands by the bed, hooked to the SDB-2.1. So I have three sets of speakers hooked to the receiver. So if I want to listen to music I turn on the main unit and have it set for speaker select A/B on and using the SDB/2.1 I can set the volume on the monitors for the best volume balance from front to back speakers listening, The small monitors are about 4 feet from your head, as the 11s are 13 feet from head. And If I want tunes in the bathroom just push a button. Great unit, very good quality, and think I'll buy another unit and set up my guest bedroom the same way. When I built my house a also put a Speaker Craft dual pole speaker in the ceiling of the hall bathroom and the speaker hook-up is the guest bedroom. So I use the SBD-2.1 for the three speaker sound distribution and volume control for my back channel. So when I use the main volume control of the reciever the sound levels stay in synk through the entire volume range of my main unit. Just set the SDB-1 and forget it. Hopes this helps. I'm an analog guy and this thinks rocks. If this doesn't help I can draw a wiring diagram. Let me know. [ Brian  Jul 03, 2017 ]
Ideally you want speakers with matching ohm impedance. The way you have this paired may cause some amplifier performance issues. You will not be able to control the volume independently but you can press the button and turn one pair off or run both pair at the same time but you go back to ohm impedance mismatch. You probably want to call yamaha to make sure you do not damage your amplifier trying to operate it that way. [ Ben  Jul 02, 2017 ]

Looking for more? Check out the next model in this lineup.

Russound SDB4 4 Pair Speaker selector

Controls four pairs of speakers

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