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    SKU: OSD-SVC205

    OSD SVC205 In-Wall Impedance Matching Volume Control with On/Off Switch

    Purchase SVC205 In-Wall Impedance Matching Volume Control with On/Off Switch
    • Outdoor Speaker Depot SKU: OSD-SVC205 impedance-matching-volume-control-with-on-off-switch
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      Compare at: $59.99
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    The OSD Audio SVC205 is a self-impedance matching in-wall volume controller with an on/off switch. Volume controls do not add gain (volume) to your speakers; they simply attenuate the volume up or down. During setup, you'll set the source volume to its optimum level, then the volume control turns the sound down to almost inaudible levels. The SVC205 is unique in that it let's you turn sound off completely. 

    • Control volume from any room
    • Low distortion and ruler flat frequency response
    • All installation materials included
    • Front-mounted setting switch and on/off switch
    What Is Impedance Protection?
    Speakers are specified by impedance, which is a measurement of resistance to alternating current, and a common value for speakers is 8 ohms. When you're connecting multiple speakers to a receiver or amplifier, you need to stay above the amp's minimum load requirements because going below the impedance rating can overheat or even damage expensive equipment. The SVC allows you to match the impedance with the number of speakers being controlled with the capabilities of your amp. A basic multi-room system will typically have an amplifier/receiver, a speaker selector, four to eight pairs of speakers, and volume controls. Impedance-matching volume controls feature three settings depending on how many speakers you are connecting. For one to two pairs of 8-ohm speakers, the setting is 1/2x; for three or four pairs of 8 ohm speakers, the setting is 4X. Keep in mind that volume controls do not add gain (volume) to your speakers but simply attenuate the volume up or down. During setup, you'll set the source volume to its optimum level, then the volume control turns the sound down to inaudible levels.
    Warning: California's Proposition 65


    This product can expose you to chemicals, including vinyl chloride, which is known to the State of California to cause cancer. For more information, go to

    • Volume Control Type: 300W Impedance Matching Knob Style w/ On/Off Switch
    • Power Handling: 300W Peak; 100W RMS Per Channel
    • Frequency Response: 20Hz - 20kHz
    • Total Attenuation: 42 dB (Max)
    • Steps: 12 (Make Before Break)
    • Impedance Matching for 1/2, 4, 6, or 8 Pairs of Speakers
    • *Can be Used as Non-Impedance Matching if Leaving Default on Jumper Setting at 2X
    • Impedance Matching Volume Controller with On/Off Switch
    • Wiring Requirement: Up to 14 Gauge Wire
    • Removable Input and Output "Quick Connect" Phoenix Connectors
    • Fits in a Standard Single Gang Box - See LV1 for Mounting Bracket
    • Unit Dimensions: (L x H x D) 1.62" x 2.5" x 2.5"
    • Warranty: 5 Years
    30 Questions asked
    Have a Questions?

    What's on your mind?

    Dennis • 12/17/2019, 2:17:43 PM So what is the recommended way to wire 4 speakers in a room to one volume controller, parallel or series? (I'm putting a 4 zone speaker switch at the amp) Is one better than the other, or does it just depend depend on the impedance you are trying to achieve? I understand how to achieve the impedance desired, and was wondering if I should run all 8 speaker wires back to the volume controller?
    Customer Service • 12/17/2019, 2:17:43 PM
    Hi Dennis, When wiring between parallel or series, one is not better than the other. Like you said, it really comes down to the desired impedance and making sure it all matches when coming back to the amp. CS 3653
    Brian • 12/17/2019, 2:17:43 PM Similar to Baxter's questions: When this impedance matching volume control unit is switched 'off', does that break the connection, or does it still maintain a connection and just burn through power? I'm wondering in case there are multiple volume controls connected in parallel and if one is turned off, it would obviously affect the impedance of the circuit.
    Customer Service • 12/17/2019, 2:17:43 PM
    Hi Brian: The connection is broken right after the input connector before you get to the transformer just the like the switch in the Speaker Selector there is no drain to the zone. The on/off switch cuts off the connection. Note; most systems are setup based upon the worse case scenario that all speakers connected will be playing at the same time and be affecting the impedance load that the amplifier sees. When you take one of the speakers out of the equation by turning it off either at the speaker selector or at the volume control like the VC-05 then you are lowering the demand on the system. The other variable is the ability of the Amplifier to handle the more demanding load say; 4 ohm versus 8 ohm. The point is the volume control attenuates the sound diverting the signal into a transformer as it lowers the volume. And even thought it become inaudible where you hear nothing the current is still being delivered into the Transformer and having an effect on the impedance. The on/off switch takes the transformer out of the equation. We recommend the VC-105 based upon this assumption. We added the VC-105 just for this reason. I hope that answers your question. Good luck TL/3717
    Charles Gatch • 12/17/2019, 2:17:43 PM I am connecting outdoor speakers to my jukebox and wish to be able to control volume to the outside speakers and to turn them off. Will this product accomplish that?
    Customer Service • 12/17/2019, 2:17:43 PM
    Hi Charles: The VC-105 of is an inside Volume control that can be mounted near your door going to the outside. Or you can purchase one of our: AL-DBPV1C Waterproof Box to Install In-wall Volume Control Outdoors, and install on outside wall. The VC-105 features an on/off switch perfect for your application. Good luck TL/3742
    Trisha • 12/17/2019, 2:17:43 PM Is the volume control 'fluid' or does it click to pre-set sound levels?
    Customer Service • 12/17/2019, 2:17:43 PM
    Hi Trisha: The Volume Control has 12 clicks and 42 dB of attenuation. Note these Volume controls are totally passive devices that add no gain. During setup you will have this at full open all the way to stop, going clockwise. Now you adjust your volume level from your source slightly below clipping (on your amplifier/Receiver). Now start turning the knob counterclockwise or down you attenuate the levels down. The signal or current is being diverted to the transformer of the Volume control lowering your volume. On most if not all Volume controls there is no on/off setting so even though the signal becomes in audible it is still passing current to the Volume control. That is also why it is important that you have a Volume control able to handle the rated power coming to the zone. And if you have a speaker selector in line between the Volume control and your Amplifier/Receiver you will have an on/off switch option. Also note that is the other advantage of the VC-105 that you are looking at, it has an on/off switch located right below the Rotary knob. This completely turns the Volume Control off at that zone. I hope that answers your question plus... TL/3879
    William • 12/17/2019, 2:17:43 PM While it is obvious that I can connect this between my speakers to control volume, it is not clear to me how the On/Off switch operates. Does it disconnect the speaker from the amplifier or can I use it to actual signal the amplifier to power down?
    Customer Service • 12/17/2019, 2:17:43 PM
    Hi William: Good question, the On/Off switch basically cuts off the audio signal before it gets to the Transformer. I believe it is like turning a zone off at the Speaker Selector on/off switch but it is typically more accessible in the actual zone with the speakers. Most other Impedance Matching Volume controls do not turn off just because the the volume knob has been turned counterclockwise to inaudible levels. Unlike the VC-105 it still presents a load to the amplifier since the signal is still active while diverting into the Transformer. TL/3950