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Russound SDB-2.1

2-pair speaker and source selector with volume control

13 Reviews | 2 questions - 3 answers

Item # 543SDB21

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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)
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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).

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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


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