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SKU: OSD-SVC405 SVC405 300W 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
  • SKU: OSD-SVC405 impedance-matching-volume-control-with-a-b-switch

    SVC405 300W Decora Style Volume Control Kit with Impedance Matching and A/B Switching - White

  • $44.87

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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 Di(2-ethylhexyl)phthalate (DEHP) which is known to the State of California to cause birth defects or other reproductive harm. 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
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Mike • 12/17/2019, 2:17:43 PM They are out of the svc-205 volume control with "on/off" switch. Is this control the same? If I were to wire the speakers to "A" and then switch the switch to "B", when I wanted to turn the speakers totally off. Will this work? Thanks, Mike
Customer Service • 12/17/2019, 2:17:43 PM
Mike, If nothing was connected to B, then yes, it would be similar to turning the speakers off. The difference would be that the on/off switch actually stops power whereas the a/b switch just redirects the power. Thanks.
Richard • 12/17/2019, 2:17:43 PM Will this function the same as the SVC205 if I have one input from the receiver and the other input unwired, with the output going to one pair of speakers? It would seem that the switch would turn it off when selecting the unwired input. Since you are out of stock on the SVC025, I thought I could use this instead.
Customer Service • 12/17/2019, 2:17:43 PM
Richard, Similarly, but the power is redirected rather than stopped. But, yes, it should work in that type of application. Thanks!
Mr. Bill • 12/17/2019, 2:17:43 PM Does this come in Black
Customer Service • 12/17/2019, 2:17:43 PM
Hello, Our volume controls are sold with white, ivory and almond color options, but not black. We do have black volume control kits that you can purchase separately. These kits include the faceplate and the knob, but the center portion of the volume control would need to be painted. Please feel free to call us with any further questions. Thanks!
Dan • 12/17/2019, 2:17:43 PM Will this work with line level or only speaker level?
Customer Service • 12/17/2019, 2:17:43 PM
Hi Dan, Thank you. This volume control with A/B switching will only work with speaker level input and output. You can use it either way though. If you have two pairs of speakers and one amp, or if you have two amps and one pair of speakers. Let me know if you have any further questions. Thanks. -BM 2329
Jason • 12/17/2019, 2:17:43 PM Does this work with 70 volt systems?
Customer Service • 12/17/2019, 2:17:43 PM
Hi Jason, This should only be used with systems using 2-8 ohms. For 70v applications, use our Mono70v volume control. -BM 2405