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    SKU: OSD-SVC405

    OSD SVC405300W Decora Style Volume Control Kit with Impedance Matching and A/B Switching White

    Purchase SVC405 300W Decora Style Volume Control Kit with Impedance Matching and A/B Switching - White
    • Outdoor Speaker Depot SKU: OSD-SVC405 impedance-matching-volume-control-with-a-b-switch
    • In Stock


      Compare at: $66.99
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    OSD Audio SVC405 is a 300-Watt impedance-matching volume control with two-source (A/B) switching that allows you to adjust the volume of a pair of speakers independently of other speakers and control the volume of two pairs of speakers and one audio source. Ideal for both home and commercial installations, this decorative in-wall volume control includes an impedance-matching feature that stabilizes the ohm load so parallel connections of multiple volume controls can be installed without damaging the amplifier. The SVC405 maintains the full hi-fi audio frequency response with no low frequency roll-off and is rated at 300 Watts per channel (100W RMS). The rotary knob adjusts the volume from inaudible to loud, and when you order the SVC405, you get the complete kit that includes the junction box, screws white trim plate.

    • Decorative, decora style impedance-matching volume control for whole house audio systems and dedicated audio zones
    • Rated at 300 Watts (100 RMS) per channel with minimal bass roll-off 
    • Includes 2-source (A/B) switching for two pairs of speakers and one source
    • Impedance-matching feature stabilizes the ohm load so parallel connections of multiple volume controls can be installed without damaging the amplifier
    • Accepts up to 14-gauge wiring and fits in a standard gang box with a depth of 2.9'' Includes junction box and screws as well as a white plate to match any room d'cor
    • Precision electronics provide low distortion and a ruler flat frequency response
    • Rotary-style knob for a wide range of listening volumes
    • Installs easily and works with almost any audio system 

    What is 2-Source (A/B) Switching?
     A/B or dual-source switching is a convenient feature that allows flexibility when you're designing your whole-house audio system. With A/B switching, you can connect two sets of speakers and one source, and those speakers can be in same room or separate rooms. For example, speakers connected to source A could be in the living room and speakers connected to source B could be in the dining room. Then simply use the A/B switch to choose between the zones. 

    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 SVC100 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/ A/B Switching
    • 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
    • Front-Mounted Switch Allows for Easy Adjustment When Multiple Speakers are Connected to a Single Receiver or Amplifier
    • 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"
    • What's Included: White Plate, Inserts, Screws, and Knob
    • Warranty: 5 Years
    28 Questions asked
    Have a Questions?

    What's on your mind?

    Z • 12/17/2019, 2:17:43 PM Can the speakers be selected to play A and B at the same time or is it just either A or B playing at once?
    Customer Service • 12/17/2019, 2:17:43 PM
    Hi Z Either A or B, but not both. TL
    Cory • 12/17/2019, 2:17:43 PM I am looking to have the a/b select on the control like this product, however, I also want to be able to turn the speakers off from the control...can this be accomplished with this product by turning the volume control down to the first position? Thanks.
    Customer Service • 12/17/2019, 2:17:43 PM
    Hi Cory, The volume control does not disconnect totally when turned all the way to the left for either A/B. A better choice for your application would be our SSVC2 that features a dedicated volume control for each speaker as well as an on/off switch per zone. It also features dual source inputs switchable per zone. Our factory direct price of $89.95 is very competitive as well. TL/MA
    Jim • 12/17/2019, 2:17:43 PM The description states it can be used with 2 inputs... I want to use it with one input switching between 2 sets of speakers... will this work for that?
    Customer Service • 12/17/2019, 2:17:43 PM
    Jim, Yes the SVC405 can be used for either two sources, and one pair of speakers, or two pairs of speakers and one source. CL
    OJH • 12/17/2019, 2:17:43 PM I am looking for a 2-source selector switch and volume control combination for outdoor speakers, how would this SVC405 device survive in New England if it where protected within a sealed outdoor weather proof receptical with a raintight clear plastic while-in-use cover? or would temperature differences cause material condensation issues? Also, a previous question asks if this controller can completely turn off the signal to the speakers, and the response was not completely - but does the lowest click on the volume control at least result in no noticeable sound eminating from the speakers?
    Customer Service • 12/17/2019, 2:17:43 PM
    OJH - You could do it with the weatherproof box. I dont see condensation being an issue. Typically, when you get to the lowest click, it is in audible. This does depend how loud your source is set to, however. CL
    JP • 12/17/2019, 2:17:43 PM I was disappointed that this came with no instructions. I currently have this connected directly to the B channel of my receiver with another pair of speakers directly connected to the A channel. On the circular "impedance matching" dial I have this set to "2", but the volume of the speakers behind this volume control is DRAMATICALLY lower than the speakers connected without a volume control even when I have the volume turned all the way up. The description on the web site talks about jumpers, but I don't see any place on this system that I can set jumpers. Is there anything I can do to get more volume out of my speakers? As it is now I can't run both the A and B channels at the same time. Thanks
    Customer Service • 12/17/2019, 2:17:43 PM
    Hi JP Try reversing the connections. In other words, put the volume control on the speaker sets that you would prefer to be at lower volumes. The volume control acts as an attenuator, reducing the power the speaker receives. CL/MA 1726