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Home / Product Category / Whole House Audio / Volume Controls / In-Wall Volume Controls / SVC300 300W Impedance Matching Decora Style Rotary Speaker Volume Control Kit with (White, Ivory, Almond) Black, Brown Optional Colored Plates

SVC300 300W Impedance Matching Decora Style Rotary Speaker Volume Control Kit with (White, Ivory, Almond) Black, Brown Optional Colored Plates

Product code: OSD-SVC-300

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Features & Specifications

The SVC300 is a pure resonance VC with 300 Watts of optimized sound quality and minimal bass roll-off. The SVC300 features Impedance matching with 1/2X, 4X and 8X settings. The Heavy Duty auto-former design features outstanding sound quality due to high permeability steel utilization in the volume control core. Another upgrade feature, the speaker wire inserts use lock clips and are detachable allowing you to connect to your speakers with ease. Each kit includes White, Bone and Ivory décora style inserts, outer plates and knobs for an easy color match. Note the Volume Control attenuates the sound, it does not add gain, You set the system optimum level with the Volume control at 0, then you have 12 steps of attenuation (where you are turning the volume down) a total of -54 Db with the SVC300. It is also a good idea to turn the room/zone off at the Speaker Selector when not using it for extended periods. Do not depend on turning the volume control down where you hear no sound. This does not turn the zone off.


• Controls the volume in the dedicated room/zone
• The Wall mounted volume controller works with almost any audio system
• Low distortion and ruler flat frequency response
• Three color choices, all installation materials included


More Info about Impedance Matching

All speakers have an impedance rating, typically 8 ohm for a pair of home speakers. To operate in the safest mode, most standard amplifiers and basic two-channel receivers are rated for an 8-ohm incoming load. To operate safely and consistently, the amp needs to see an 8 ohm load, and that’s where speaker selectors and impedance-matching volume controls come into play. In a basic multi room system, only a Speaker Selector is used to connect the speakers to the amplifier/receiver. Not only does the Speaker Selector allow you to connect multiple speakers to the amplifier but also adds internal Impedance Protection which is enabled by a manual protection switch. Both our ISS and DSM series Speaker Selectors feature internal Resistors that protect the amplifier. The down side is that the power rating normally 140 watts is cut in half when the protection switch is enabled so rated at 70 watts with protection. In a standard multi-room system (using Impedance Matching VC) you will typically have an amplifier/receiver, a speaker selector with 4 to 8 zones, and volume controls connected to all the speakers. Impedance-matching volume controls provide more precise protection for the amplifier/receiver versus the protection built into the standard speaker selector. Plus with the protection switch in the off position you will have the maximum power handling capability of the respective speaker selector. It is important that the protection switch is turned off when using the Impedance matching Volume Controls. Most impedance-matching volume controls feature three standard settings: 1/2x, 4x and 8x, while some add a 16-ohm setting like our VMS series. These settings correspond to a chart in the owner’s manual based upon the type of amplifier (4 or 8 ohm) and the number of 4 or 8 ohm speakers that you will be using in the multi-zone/room/speaker system. You can use both 4 and 8 ohm speakers when setting up your system. But you need to count a 4 ohm speaker as two 8 ohm speakers when calculating your Impedance setting.


  View Owner's Manual            Product Information


27 Questions & 27 Answers
Wayne Powell
from Lake Havasu , AZ. asked:
March 22, 2019
So physically where on the control is the impedance switch located ? I am using your SVC-300 and OVC-300 rotary switches. Thanks for the help.
1 Answer
Hi Wayne: I will send you under separate email, images showing where the switch is for all the OSD Impedance Matching Volume Controls. TL/5466
Submitted by: Tim Leahy on March 24, 2019

from Dallas, Texas asked:
October 10, 2018
I am purchasing 1 pair of AP640 and 1 pair of AP650. I will be powering speakers with XMP100. I want volume control for the AP640's and not for the AP650's. I was thinking of running 14 gauge 4 conductor wire to a SVC300 impedance volume control. Then I would run 14 gauge 2 conductor wires to each individual AP640 speakers from the volume control. I would homerun the AP650's straight into the back of the XMP100 amp. Would this be correct? Also, what impedance would I set the SVC300 on for the AP640's?
1 Answer
Hi Nick: The AP650 and AP640 are not in the same series. Consider two pairs of AP650 or a pair of AP650 and a pair of AP525. Both feature a unique 2-way mounting bracket as well. 14 gauge is good, but you will find the OVC300 best for your application (outdoors). I also suggest more power either the AMP200 or XMP300 which leaves you room to expand the system possibly adding additional speakers and even a subwoofer. Would still like to see pictures of your structure. TL/5238
Submitted by: Tim Leahy on October 12, 2018

from OK asked:
September 23, 2018
Hi, i have 4 zones with 2 speakers per zone. Im using the amp 300 bridged. I have the bridged outputs connected to a speaker selector. The speaker selector impedance mathing is turned off. What should i have the impedance switch on the volume control set to? I have 4 zones.
1 Answer
HI Jim: The AMP300 has Speaker A; left and right (+/-) and Speaker B; Left and right (+/-). To Bridge the Amplifier, you connect the two positive's outputs from Speaker A. The Bridged mode is not the best application for multiple speaker setup. When in the Bridged mode it is critical that the AMP 300 sees a minimum 8-ohm load. What speaker selector are you using (brand/model number); I am assuming its one of our ISS or DSM passive speaker selectors rated at 140 watts per channel without Protection (and 70 watts with protection turned on). You already mentioned you are allowing the SVC300 handle the heavy lifting (Impedance protection). The safe setting for a standard amplifier would be 4X. The 4X stands for the number of 8-ohm pairs of speakers connected to the amp after all wires are connected (and all zones are turned on). But the AMP300 is a High Current Amplifier that is rated to 2 ohms and meant to operate at 4 ohms putting out over 200 watts versus the 135 watts for the 8-ohm setting. Another way to improve your amp 300 is by adding our Pre-One Preamplifier. Not only does it provide four selectable inputs, Control knobs for Bass, Mid, Treble, and Loudness. But the unique feature is the 1.5V output which triple's the input signal into the AMP300 allowing you to turn the master level controls down to 60%; TL/5214
Submitted by: Tim Leahy on September 24, 2018

from Richmond, VA asked:
May 8, 2018
Looking for a bluetooth amplifier to go with this volume control? No stereo needed. Just to send music to my ceiling speakers from my iphone etc.
1 Answer
Hi Jason: You have a couple of choices. Number one checkout the XWB to in wall Bluetooth Amplifier with dual source option and Volume Control. This will fit in the junction box you were going to mount the SVC300 volume control but gives you a 25 watt digital stereo amplifier. You would connect your two speakers to the amplifier in the junction box. You have a second plate in the kit that is mounted near the floor. This features a power plug to connect the wall wart power supply that plugs into the nearest outlet. The plate also features a 3.5mm Aux input. Both the Power and aux input have connecting wires to the Bluetooth amplifier typically mounted 3 or 4 feet above the lower plate. It has the Bluetooth amp/receiver built in and controlled with the Volume control knob. The other option is our new NERO Digital Integrated receiver with internal Bluetooth Receiver and stereo RCA input, 3.5 aux input and Digital Fiber Optic input (to connect directly to TV or CD/DVD player. Plus it has the Bluetooth Receiver as well. This also has a Volume Control on the front panel (so you can skip the SVC300 with this option as well). This also features a Subwoofer output with variable level controlled by the front volume knob as well. This features a true 16 to 24 bit DAC. A true Audiophile unit. TL/4966
Submitted by: Tim Leahy on May 8, 2018

from Houston, TX asked:
December 15, 2017
Hi, i have 3 volume controllers SVC300 connect to 3 pair of 8ohm speakers(1 pair to each VC). I connect these 3 VC to front channels of Denon avr 1913 and when we turn up the volume, the receiver breaking out and turn off by itself. Do you know why and what is the right setting,thanks?
1 Answer
Hi Thomas: You should have each Volume Control set to 4X assuming you are wiring the three pair of speakers (each with a SVC300) parallel to the Left and Right front channel speakers. And you have the receiver on 2 channel stereo mode. Note most of the AVR receivers want to see 8 ohm loads or they have a relay that will make it go into protect mode. TL/4696
Submitted by: Customer Service - Q&A on December 19, 2017

from Louisiana asked:
July 2, 2017
Hi, I have a somewhat outdated system that I'm trying to recover. I have 6 Sonamp 275SE's and 8 Mariner S63 outdoor speakers. Because of the minimum ohms on the amp (2.66) and the speakers (4), I can't drive two speakers with one amp. But if I go one amp per speaker, do I also need an individual volume control? Or said another way, can I connect two amps and two speakers to the same SVC-300?
1 Answer
Hi Pete: Did you download the owner's Manual for the Sonamp and Mariner speakers? I believe you have 6 of the Sonamp amplifiers and 8 each or 4 pair of Mariner's 63. I did not see a S63 only an outdoor Patio Speaker Mariner 63 that is rated at 6 ohm nominal and 4 ohm minimum with a power rating from 5 to 100 watts. The Sonamp 275E is Rated at 75 watts at 8 ohms, 125 watts at 4 ohms and 135 watts at 2.7 ohms. 2.7 watts is equivalent to three pair of 8 ohm speakers in parallel. The Sonamp is also rated at 250 Watts bridged Mono. A little too much power if you are really planning on driving a single speaker. Technically you can easily drive a pair of Mariner 63 speakers with a single Sonamp. You could also run 2 pair of 63 speakers with a single Sonamp where your impedance would drop to 3 ohm. I found both owners manuals on line. One was for the Sonamp 275E and the other was for the mariners Series of speakers. Maybe you can tell me more about the S63 that you have. You could take pictures of the speaker both front and back. Sometimes it will have an impedance rating on the speaker. Do you have the original owner's manual as well? Let me know... TL/4447
Submitted by: Customer Service - Q&A on July 2, 2017

from calgary, AB asked:
February 4, 2017
I have a Denon AVR-4520CI receiver and am using the zone 1 and 2 outputs for sound outside the main room. Main room users 5.1, leaving remaining 2 channels. I have an OSD ATM-7. I have four pairs of speakers I'd like to use outside the 5.1 main room. I am thinking of having zone 1 from the Denon direct to one pair, then use the ATM-7 to select the other three pairs with input from Denon zone 2. If I put an SVC300 in each of these three areas, and set them to 4x, will this provide the potection I need for my amp/receiver?
1 Answer
Hi Stephen: Typically the Receiver manufacturers especially the Japanese companies like Denon, Onkyo, Yamaha and Pioneer do not recommend connecting more than a single pair of speakers to their second zone outputs. Their concern is that connecting anything other than a single set of speakers may cause an unsafe load to the amplifier especially if you are playing the Home Theater at the same time. Most will recommend an external amplifier like our AMP200 or AMP300. Having said that I think you have selected the proper volume controls (at the 4x setting for each) along with the ATM7 to make sure the Receiver does see an 8 ohm impedance or higher. The Japanese Receivers usually have relays to protect the amps that will shut down before any damage and the Receiver will run hotter than normal if their is an issue before shutting down. Then you might consider adding an external amplifier (all have pre-amp output for that reason). So good luck... TL/4206
Submitted by: Customer Service - Q&A on February 28, 2017

from Ohio asked:
May 26, 2015
Can I run two dual voice/coil speakers off one switch?
1 Answer
Hi Kyle, You can, but it would really depend on the amp you're running. Usually an amp that can run at 4ohms is going to handle that better.
Submitted by: Customer Service - Q&A on June 2, 2015

from Suisun City, CA asked:
October 16, 2014
Can two of these be placed side-by-side in a two-gang box without overcrowding or overheating issues?
1 Answer
Hello Wayne, I don't believe you would have any issues with overheating, but I'm not sure they will fit in a dual gang box.
Submitted by: Customer Service - Q&A on October 20, 2014

Peter R
from Tampa, FL asked:
April 27, 2014
I am thinking about replacing a couple pairs of ceiling speakers with the ICE650's. these are all going to be on my zone 2 Yamaha RX-A730. In looking at your wall switches, I want good quality sound controller but I question if I need impedance matching if I already have that feature with my Jamo ZI-8. If I don't need impedance matching in the volume controls, which one do you recommend that is also good quality. I just need round knob for single gang. Thank you.
1 Answer
Hi Peter, Great choice of speakers! I wouldn't, however, recommend running more than 1 pair of your Yamaha receiver's Zone 2. I believe it can only handle an 8ohm load, and an impedance matching volume control doesn't really work how you think it would in that scenario. I would contact Yamaha to be sure though. Ask them if they recommend running 2 pairs of speakers off that zone before you attempt it. If you are planning on running more than 2 pairs, then you should definitely consider getting yourself an amp to run off the Yamaha receiver to properly and safely power them. BM 2645
Submitted by: Customer Service - Q&A on April 28, 2014

David Vidaurri
from Houston asked:
April 10, 2014
Can this control 4 speakers.
1 Answer
Hi David, Yes, you can run two pairs of speaker off this but it does only have 2 channel outputs, so you will need to parallel the 2nd pair. Make sure you are running an amp/receiver that can handle two pairs on one load. Thanks! -BM 2603
Submitted by: Customer Service - Q&A on April 10, 2014

john fleming
from phoenix, arizona asked:
January 5, 2014
i have a svc300 volume control. Occasionally it / the speaker is booming, would this be the svc300 volume control switch ?. I also cannot set the volume to completely silent, is this normal ? thank you.
1 Answer
Hi John, A volume control has nothing to do with frequency or tone that would cause the "booming" in your speaker. The volume control only regulates the current of electricity going to the speaker. However, if the actual volume control is making a vibrating sound, it may be that you are inputting too much power to it from your amp. With some of our models, like the SVC300, turning the knob down does not close the current. We do have some models, like the SVC205, that have an on/off switch that will close the current causing the sound to turn off. CS 2426
Submitted by: Customer Service - Q&A on March 6, 2014

from Texas asked:
November 18, 2013
I bought the SVC300 and have it hooked up to two of your 8 ohm outdoor speakers on channel B on my Yamaha receiver. I have 8 ohm Klipsch stereo speakers hooked up inside to channel A of my Yamaha receiver as well. The problem I have is that the outdoor speakers are much quieter than my indoor speakers even at full volume when I select A+B and I can't adjust volume levels between A and B independently through my receiver. Any suggestions?
1 Answer
Hi Derek, Thanks for contacting us. It could be a number of things. One possibility, however unlikely, is that the wire running to the outdoor speakers is a longer run than the indoor speakers, thus giving you less quality/volume to the outdoor pair. Another reason could be the size/efficiency of the outdoor speakers being different than the indoor speakers, causing the volume to be lower. So if the indoor speakers have a higher db rating, say 90-92db, and the outdoor speakers have a lower rating such as 88-89db, than the amp has to work harder to power the outdoor speakers than it does to run the indoor speakers. Have you tried bypassing the volume control to the outdoor speakers to see if that changes anything? Let us know. Thanks! -BM 2338
Submitted by: Customer Service - Q&A on November 19, 2013

from Springfield, MA asked:
June 21, 2013
Can I use this volume control 'downstream' from an OSD SSVC4 speaker selector/volume control box? In other words, use this as a second volume control in one of my zones without causing impedance or other issues? My patio zone is a couple rooms away from the SSVC4 box. I'd like to put in a wall switch just inside the door to make volume adjustment less of a chore. Doable or would you have another solution? Thanks!
1 Answer
Hi John, You will not be able to use a volume control with the SSVC4. You’ll need a speaker selector, like the ISS4 or the DSM4, to have the volume control in the zone. CL/MA 2002
Submitted by: Customer Service - Q&A on June 25, 2013

from maine asked:
May 10, 2013
I have installed an SVC-300 to one pair of Cambridge Soundworks Model Six speakers which are 8 ohms. The receiver is an Onkyo TX-8050 which puts out a steady 80 watts. I am using 14 gauge wire with a run of approximately 60 feet. When I turn the receiver to a higher volume, the SVC-300 seems to have a slow pulsating vibration to it. Is this normal? What should my setting be on the volume control, 1/2x, 4x, or 8x?
1 Answer
Hi Matt, The setting for this volume control would be 1/2X. If you have the volume up considerably on your Onkyo and down on the SVC300, it's holding back all that current in the transformers so it could create the vibration you describe. CL/MA 1884
Submitted by: Customer Service - Q&A on May 16, 2013

from NH asked:
December 30, 2012
The instruction states: "find out the minimum impedance of the amplifier found on the back" it states 6-8 ohm. Other instructions state switch setting is based on how many pairs of speakers per control. I am running 1 pair per control, so what do I set the impedance switch to....1/2x or 8x?
1 Answer
Hi Dave, The Impedance setting is based upon how many total speakers you are connecting to a single output from your amplifier/receiver, whether you are connecting directly to the amplifier/receiver to the volume controls or going through a speaker selector before getting to the volume controls. As an example if you have four pairs of volume controls each connected to a pair of 8 ohm speakers, your setting will be 4X on each volume controls. If you were using two volume controls connected to two pairs on each volume control, the setting would still be 4X. If you have three pairs of 8 ohm speakers connected to three volume controls, step up to 4X. If you have 5 (6, 7 or 8) total speakers, step up to 8X. If you have a pair of 4 ohm speakers (BOSE outdoor speakers as an example), you count them as two 8 ohm speaker pairs. Let me know what your amplifier/receiver you are using and how many speakers you have and if you are planning to use a speaker selector. If you are using a speaker selector with impedance-matching volume controls, you may need to make sure the protection switch or button is disabled (turned off). That way the impedance- matching volume controls are doing the protection. TL/MA 1503
Submitted by: Customer Service - Q&A on December 31, 2012

from California asked:
August 22, 2012
This may be a simple question but can this be used in a 12V audio system in an RV?
1 Answer
Hi Justin, The SVC300 will work because you are still at a speaker level (8ohm). This is a passive in-line device. The12 volt power is to the head unit which has nothing to do with the speaker signal. So yes you can use one of these between your head unit and the speakers. CL
Submitted by: Customer Service - Q&A on August 22, 2012

from Hong Kong asked:
August 7, 2012
I would like to ask whether a Back Box is included. Would you please also advise the exact dimension for the device and the back box. Hong long does it take for the product to arrive Hong Kong? Thanks a lot!
1 Answer
Hi Nicole, The SVC300 does not feature a back box, but the OVC300 does include one. The in-wall SVC300 will fit in a standard single gang box. We have the OVC300 that has a complete box type housing primarily for outdoor applications but can be adapted for indoor use. CL Dimensions are: SVC300: 4.125cm W x 6.35cm H x 6.35cm D OVC300: 7.25cm W x 11.43cm H x 8.25cm D We ship United States Postal Service to HK. CL/TL/MA
Submitted by: Customer Service - Q&A on August 8, 2012

from Hong Kong asked:
August 7, 2012
What is the dimension of the volume control and is there a matching base box available as well? Thanks!
1 Answer
Hi Cerys, The in wall SVC300 will fit in a standard single gang box. We have the OVC300 that has a complete box type housing primarily for outdoor applications but can be adapted for indoor use. CL Dimensions are: SVC300: 4.125cm W x 6.35cm H x 6.35cm D OVC300: 7.25cm W x 11.43cm H x 8.25cm D
Submitted by: Customer Service - Q&A on August 8, 2012

from Sudbury, ON asked:
June 23, 2012
it states this is to be mounted in a single gang box, but can it be used in a 3 gang box with other decora switches?
1 Answer
Hi Dave, Yes, you can mount it in a double- or even triple-gang box with other components. TL/MA
Submitted by: Customer Service - Q&A on June 26, 2012

from allen, Texas asked:
June 18, 2012
would you recommend an appropriate impedance volume control for my speakers- a pair of klipsch R-1165-C 11 to be connected to Denon AVR-2113 CI Thanks
1 Answer
Hi Alex, The SVC300 would be a good choice. It features a rotary knob to control the volume. We do offer a slider-style version as well, the VMS300. TL
Submitted by: Customer Service - Q&A on June 18, 2012

from New York asked:
May 29, 2012
I have a Lafayette stereo receiver rated at 150watts with your typical speaker A,B A&B combinations. I have 2 indoor speakers already hooked up. I have installed (2) Polk Audio RC80I speakers installed outside under the eave. Is the SVC300 the proper switch to use? And if it is, what setting would I use on the switch itself? Appreciate your help...Thanks..
1 Answer
Hi John: I am assuming you mean a stereo pair of speakers on the inside connected to the Speaker A output and you are planning to use the pair of Polk In-Ceiling Speakers connecting them to the Speaker B output. The SVC300 will work fine if you are planning to mount the switch in the wall in the interior of the home. We do have outdoor Volume Controls as well. So one pair of 8 ohm speakers inside and a second pair of 8 ohm speakers outside, is that about right? Question are you planning to connect a volume control to the inside pair as well or are you just wanting to control the outdoor speakers with the single volume control. In this setup the Volume Control would be set to 1/2x the same it would be set to if you had a second volume control connected to the inside speakers. I might suggest our SSVC1 table top volume control which features both a on/off switch and Dual source A/B switch. You could step up and use our SSVC2 and connect both the inside speakers and outside speakers. It all depends on how much control you are looking for and how accessible you are to the speaker wires. We do offer our CL3 speaker wire which works for both in-wall and outdoors including direct burial. You can buy either 4 or 2 conductor (16 or 14 gauge). 4 Conductor would be used from the Receiver to the Volume Control or Speaker Selector than use 2 conductor to each speaker. Please let me know your exact setup so I can be of more help. TL
Submitted by: Customer Service - Q&A on May 30, 2012

from Maryland asked:
May 11, 2012
I have a long speaker cable run to this control for my outdoor speakers about 60' so I am using 12 gauge speaker wire. Will I be able to squeeze the 12-gauge wire into these connectors or will I have to add a junction box and splice the 12 gauge down to 14 gauge wire? I would like to not have to splice down the cables obviously, but it looks like there are no speaker controls that can accommodate 12 gauge wire. Thanks in advance.
1 Answer
Drew, This is made for 14 gauge max. Most customers thin the wire down to accommodate that large of speaker cable. CL
Submitted by: Customer Service - Q&A on May 11, 2012

April 17, 2012
1 Answer
Hi Aaron: We hope to have the SVC300 back in stock by mid to late May. We do have ample inventory of the VMS-300 the Slider style Impedance matching Volume Controls. TL
Submitted by: Customer Service - Q&A on April 17, 2012

hadis jusic
from Ankeny,iowa asked:
November 20, 2011
I have hard time to figure up how to conect my two pairs ceiling speakers end one pair wall speakers with wall volume control and ampfire'Whera i need to go with my wires from speakers to amp' or wall wolume comtrol please help
1 Answer
The SVC300 Volume Control is connected to the amplifier using either speaker A or B output with a 4- conductor cable (right and left with both having a positive and negative). If you are using a single volume control for three pairs of speakers, you need to wire them in parallel. Take four conductors from the output of the volume control then splice or terminate the wires in parallel (i.e., positive to positives and negatives to negatives). Take the left input (positive and negatives) for the three pairs and terminate them to the 2-conductor coming from the left (+/-) output of the volume control (positive to positves and negatives to negatives). Do the same with the right (+/-) side inputs as well from the three pairs of speakers. Now here is the key: make sure you set the impedance switch of the SVC300 to 4X! TL/MA
Submitted by: Customer Service - Q&A on November 21, 2011

elmer l. tayone
from davao city, phillipines asked:
October 27, 2011
1 Answer
We do not have a supplier in the Philippines; however, we do ship overseas. If you are a dealer/or installer, we encourage you to take advantage of our dealer program. Keep in mind that you will have to send us a copy of your business license or permit as required in the Philippines. MA
Submitted by: Customer Service - Q&A on October 27, 2011

from Denver asked:
October 13, 2011
i have one svc300 and want to use it to control the volume on 2 pairs of speakers. i am having trouble getting the speaker wires (2) to fit in each of the four connector outputs. am i doing something wrong?
1 Answer
The inputs are supposed to accommodate up to 14 gauge. It gets tight when you try to connect two 16 gauge wires together. You can splice the two together with a wire connector that will accommodate three conductors then run a single jumper wire to the input; so eight conductors would become four. They would be wired in parallel still and make sure you set the impedance switch of the SVC300 to 1/2X.
Submitted by: Customer Service - Q&A on October 19, 2011

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