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Home / Product Category / Whole House Audio / Volume Controls / In-Wall Volume Controls / SVC205 In-Wall Impedance Matching Volume Control with On/Off Switch

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

Product code: OSD-SVC205

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Features & Specifications

The OSD Audio - SVC205 is a Self-Impedance Matching 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 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


Other Product Info

There are two types of volume controller - Impedance matching and Non-impedance matching. If you connect your speaker parallel to the receiver or connect the speakers into an impedance protection speaker selector, use impedance matching volume controller. If you connect just one pair of speaker directly to the receiver or your speakers are connected directly into an impedance matching speaker selector, use regular volume controller.
Quality is critical to the successful sonic performance of any whole house audio system. After all, it’s about how the system sounds and how well it works. From front to back, our pro-install series is built with close attention to performance, reliability and durability. The result is a blend of transparency and functionality, with low distortion and ruler flat frequency response. We bring you seamless control for every room in the house.


 Product Information


23 Questions & 23 Answers
mark mcbride
from Delaware asked:
October 29, 2019
Can a speaker be wired onto a timing switch ??
1 Answer
Hi Mark:

Do you have an actual switch in mind? The volume controls are just wired inline, four-conductor input (L&R +/-), and four-conductor output. Pretty simple.


Submitted by: Tim Leahy on October 31, 2019

from Knoxville TN asked:
October 1, 2019
I have an ATON DLA4 zone system with 2 or 4 speakers in a zone, the touch pads installed are not working, will this volume control with on/off switch work with my system? Does it have an IR receiver built in?

I attached picture of what is presently installed. Anyone know what I can use that will work?

1 Answer
Hi Marion:

The SVC205 features an on/off rocker switch on the front panel. It has no built-in IR. Our factory featured a VC with built-in IR, but we never brought it in since the demand was dropping off. I believe the equipment you have is older and hard to replace. We are introducing a Six Zone, Six Source multi-controller with Optional key Pad controllers (connected by Cat5), but the unit will feature an App that will allow you to duplicate the control pads. So you can use your phone or add the physical control pads and control manually in each room or use the app. That will be here by the end of the year. Other companies offer built-in IR Receivers, check out AMAZON.


Submitted by: Tim Leahy on October 3, 2019

from Hidden Springs ID asked:
June 14, 2017
Looking for an in wall volume control that's weather proof (outdoor use). Is this it? ,
1 Answer
Hi Ken: The SVC 205 can not be mounted in an outside wall unless you add the special housing made to protect the Volume Control from the elements: Here is the link on our site; AL-DBPV1C Waterproof Box to Install In-wall Volume Control Outdoors Product code: AL-DBPV1Cousing Good Luck TL/4426
Submitted by: Customer Service - Q&A on June 15, 2017

Charles Gatch
from Savannah, Georgia asked:
March 8, 2016
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?
1 Answer
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
Submitted by: Customer Service - Q&A on March 8, 2016

from Atlanta, GA asked:
November 23, 2012
I am currently building a house and am planning on using 6 of these volume controls to control five different 2 speaker zones and one 4 speaker zone. I will eventually add an external amp to power all zones, but right now I'm going to run all zones off of the second powered zone on my Onkyo TX-NR809 receiver (135 WPC). Are there any issues with this setup (besides probably being underpowered)? I am assuming that by using these volume controls, I do not need an external speaker selector.
1 Answer
Hi Darren, In most cases, when you use a speaker selector along with impedance-matching volume controls, the speaker selector offers a way to organize or combine all your wires (in parallel) and have a single set of wires to connect to your receiver (your channel 6 and 7). In this setup, you turn the protection switch off on the speaker selector, allowing the impedance-matching volume controls do their magic. Since standard impedance volume controls do not turn the zone off when you turn the volume down below audible levels, it just sits there soaking up the current. That’s why we recommend using the on-off on the speaker selector. Choosing the SVC205 speaker selectors gives you the ability to turn the zone on or off in the respective room. The SVC205 eliminates one of the reasons for going with a separate speaker selector. However, what do you do with all those conductors coming back to your equipment rack? Check out the SPW8 under Audio Video Wall Plates. This will allow you to connect and organize all incoming wires, 20 conductors from five rooms and eight conductors coming from Zone 6. The Onkyo TX-NR809 is a beast (great choice) with lots of power out. I am not sure if 7 pairs of speakers are advisable on the internal amp which still has to share with the other five channels. My suggestion is to look at our AMP200 or AMP300 to connect to you Room 2 Pre-amp output. Then connect your SPW8 and SVC205s. I hope that helps. TL/MA - 1404
Submitted by: Customer Service - Q&A on November 23, 2012

from Ohio asked:
September 14, 2016
Hello, I was wondering how the impedance matching function works. It looks like it is just a limit switch that stops the volume from being able to be turned all the way up. Is that effective in protecting my amp in a setup where I have 8 sets of speakers running in parallel?
1 Answer
Hi Kyle: There are other factors to take into consideration. We do not recommend connecting a 8 zone Speaker Selector to a second zone output from a AV Receiver. Most AVR manufacturers recommend only connecting a single pair of speakers to a zone 2 output (speaker level, using internal amplifier). But we recommend utilizing at a minimum a High Current Amplifier like our AMP 200.Then a speaker selector is used to organize the single output connection to up to eight parallel stereo connections (up to eight zones).Most speaker selectors include some form of protection as well but this is not used when utilizing Impedance Matching Volume Controls to do the heavy lifting (impedance matching/protection). You do have the ability to turn each zone off when not in use. Note most Impedance Matching Volume Controls to not turn off simply by turning the sound down to in-audible level. In those cases the signal is still live at the VC, just diverted into the Transformer. That is why the VC-105 is unique, it features a true on/off switch allowing you to turn thwe zone on/off locally. It depends on your application, are you planning on playing all zones all the time like in a restaurant or this your whole house audio setup where other than parties you would play selected zones? Yes there is some limitation to the output when all Volume Controls are set to 8X versus 4X. If you purchase one of our High Current Amplifiers you can get away with the lower setting on the Impedance Matching Volume Controls especially if you are not listening to all zones at once and have the ability to turn the zone off when not being used. Good luck TL/4068
Submitted by: Customer Service - Q&A on September 22, 2016

from Dallas, TX asked:
June 23, 2016
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?
1 Answer
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
Submitted by: Customer Service - Q&A on June 23, 2016

from Chicago, IL asked:
May 14, 2016
Is the volume control 'fluid' or does it click to pre-set sound levels?
1 Answer
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
Submitted by: Customer Service - Q&A on May 15, 2016

from ny asked:
February 21, 2016
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.
1 Answer
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
Submitted by: Customer Service - Q&A on February 22, 2016

from CA asked:
December 7, 2015
I have a TX-NR636 receiver. Looking at connecting 1 set of speaker to Zone 2 & using a AMP200 connected to Zone 2 out for 2 additional sets of speakers. All speakers are 8 Ohm. Is the VC105 impedance setting 1x?
1 Answer
Hello, How many VC105 are you planning on running? Typically you want to set the impedance to however many sets of speakers are running off the same amp. So if you are running an additional 2 sets off the AMP200, I would set the impedance to 2x.
Submitted by: Customer Service - Q&A on December 14, 2015

Jason Baxter
from Nashville, TN asked:
March 13, 2015
Are you saying with this Volume control with on/off switch that in the "off" position for a zone it will not draw the amps power thus providing more wattage to the other zones?
1 Answer
Hi Jason: That would be an over simplified way to look at it . You also have to take into account what amplifier or Receiver you are using and how many other speakers are connected, what the impedance setting is on each Volume Control and other factors. The real advantage of the SVC 205 is you have the ability to turn the zone off completely rather than turning the volume down until you can no longer hear the sound. If you have a speaker selector and you have the ability to turn the zone off that will work but most people would not take the time to do rather than just turning the volume down to the point of no sound. The problem is the Volume Control in order to turn the volume down reroutes the signal into the transformer so it continues to draw current and effect the whole system. TL/3185
Submitted by: Customer Service - Q&A on March 18, 2015

from NY asked:
March 10, 2015
I want to install 5 speaker zones running off my receiver's (Onkyo TX-SR608) zone 2, and through a 6 way speaker selector (OSD-ISS6). 95% of the time the speakers will not be run all at once, with 1 or 2 zones being the usual load. 3 of the zones are close to the receiver and can easily use the receiver's volume control. With that being said, here are my questions: If I purchase SVC205 controllers to put on some of the zones, will I need to purchase one for each zone, or can I just use them on the zones not near the receiver? If my speaker selector has a protection circuit, is it better to use that and a non-impedance matching volume controller, especially if at many times only one zone will be active? (My idea being that I can turn the protection circuit off, and get more power to the individual zone in use) If the SVC205 is switched off, how does that affect both the total impedance and the power available to the other speakers? Does the switch have the same effect as cutting the zone from the system? If 4 of the 5 zones are switched off, the jumper on the last zone will still be set 8x- does that mean I will only be getting 1/8 of the total power to that zone? Tahnk you
1 Answer
Hi Brodie: A good question... we usually always recommending setting up the system so it can handle the worse case scenario, in your case say running all your zones at once and at high volume levels. I also like to recommend using the Impedance Matching Volume controls to protect your amp (Onkyo Receiver) versus depending on the Protection switch on the ISS6. The way the protection works on the ISS6 is there are Internal Resistors that cuts your power handling in half from 140 to 70 watts. It is true if you use Impedance Matching Volume Controls you will need to have one on all zones connected. Note most Receiver manufacturers do not recommend using a Speaker Selector connected directly to the speaker level output for Zone 2 like you are doing. The reason being there are too many chances that the Receiver will see a load at 4 ohms or lower that may damage the Receiver. The zone 2 output is really meant to drive a pair of speakers in one additional room. Or connect to a external amp or control system (like the Breathe Audio we sell on the OSD web-site). So the first thing I would ask is are you connecting the Speaker Selector directly from the Zone 2 Speaker Level output? If not you should look at purchasing something like our OSD AMP200 and connect to the Signal level pre amp output then consider connecting the ISS6 to it and utilize Impedance matching volume controls. Note the SVC-205 works the same as our SVC300 but allows you to turn of the zone at the Volume Control before the internal transformer see a signal rather than having to go back to the speaker selector to turn the zone off. Typically people will just turn the volume down to an in audible level where the transformer is loaded up and stopping any signal to pass through but it is still affecting the overall system. With the SVC 205 you can take the volume control out of the signal path just like you are turning it off at the Speaker Selector. Maybe I can help you further if you can send us a diagram of your system listing all the rooms the of speakers and the sources you are using. Good luck TL/3181
Submitted by: Customer Service - Q&A on March 18, 2015

Giuliano Presta
from philadelphia asked:
April 22, 2014
I would just like to know how many speakers i can control with these at 1 time?
1 Answer
Typically with our 300 watt volume controls, you can run 2 or even 3 pairs of 8ohm speakers. You just need to make sure you have sufficient power to run each speaker while not exceeding the max input rating for the volume control. BM 2633
Submitted by: Customer Service - Q&A on April 24, 2014

from Utah asked:
January 27, 2014
Will this work for a CAT5 System or a Legrand System?
1 Answer
Hi Joe, It has speaker wire connectors, so it's only intended to be used in line with a stereo amplifier/receiver. If your CAT5 system has an amplifier that runs to speakers via speaker wire, then you could use this, but it would not use any CAT5 wire, as it's analog, not digital. Let us know if that helps. Thanks. -BM 2462
Submitted by: Customer Service - Q&A on March 10, 2014

from Brighton, MIchigan asked:
November 9, 2013
I'm installing this device and I'm finding the wires are not staying fastened in the connector. I'm using CL3 14/2 speaker wire. Are there other connectors or options for fastening wires to this device.
1 Answer
Rod, The screws really have to be tightened down in order to properly secure the wire in the phoenix connector. Is the wire twisted or soldered? -BM 2327
Submitted by: Customer Service - Q&A on November 11, 2013

from Tampabay asked:
September 12, 2013
I will plead ignorance for any mistaken wiring. I have three sets of two speakers in separate rooms that I wish to hook to a zone2 of an Onkyo receiver. I purchased three of these switches and an OSD SPW-8 speaker selector. I wired the zone2 to the red input of the SPW-8 and the pre-wiring in the house to the three separate areas. I wired the volume control, set the impedance to 6, and turned it on?? I have sound, but the knob on the switch seems to change the balance between the speakers not the volume. Also, the on/off switch has no effect as I have sound in each position of the switch. Any advice is appreciated!! Mike
1 Answer
HI Mike: It should be pretty straight forward. I am assuming you connected the ONKYO Room 2 output (maybe channel 6 and 7) directly to the red input connector on the SPW-8. Then you connected zone 1, 2 and 3 to a SVC205 Impedance matching Volume Control making sure to set the impedance Setting located under the Rotary Knob to (you say 6x) to hopefully 4X (pairs not each). Then you made sure to connect to the the right and left output from the zone output on the SPW-8 (right and left +/-) to the input connector found on the bottom of the back of the SVC205 speaker selector. Then connect the left and right speakers from the output connector located at the top of the back of the speaker selector. Does that sound like your actual setup. Then the on off switch should turn the selector on or off. Note the impedance matching settings are set to pairs not each speaker. If you have 1 or 2 pairs the setting would be 2x. If you have 3 or 4 pairs (3 pairs I am assuming in your system) you set it to 4x and 5, 6, 7 or 8 pairs it should be set to 8x. That is assuming you were using 8 ohm speakers. If you were using 4 ohm speakers you have to count that pair as double or two pair of 8 ohm. Let me know if this helps TS-2218
Submitted by: Customer Service - Q&A on October 17, 2013

from Madrid, Spain asked:
May 2, 2013
Is there any volume control accesorie in black colour for osd-svc205?
1 Answer
Hi Manuel, Unfortunately, we do not offer a black face plate for the SVC205 at this time. CL/MA 1852
Submitted by: Customer Service - Q&A on May 3, 2013

Joy Facun
from Toronto, Canada asked:
April 23, 2013
I am in the process of adding speakers in my living room. I have a set of Bose Freespace 6 Model 1010 ( 4 speakers and an amp). Unfortunately, the in wall volume control didn't come with it and I know that this model was already discontinued. I checked around and no ones carries this volume control anymore and their newer model volume control won't work with my unit. I am wondering if this volume control SVC205 or 405 model are universal and will be able to do the job? I have 4 speakers pre-wired in the living room. I was thinking of connecting them in parallel so I can control these 4 speakers with one in wall volume control. These bose speakers has 4ohms impedance and if these are connected in parallel, the impedance rating drops. Will this still work? I appreciate if you can confirm if this volume control can be used with my application? Thanks..
1 Answer
Hi Joy, Our SVC205 volume control should work. The setting internally for the impedance matching would be 4x. Connect your speakers in parallel and you should be good to go! CL/MA 1821
Submitted by: Customer Service - Q&A on April 26, 2013

from Minneapolis, MN asked:
March 29, 2013
I have a pair of 8 ohm speakers in my game room that will be run to a VC, and another pair of 8 ohm speakers outside which will also be run to a VC. My question is, can I hook up both volume controllers together to the B output of my receiver? If I can, what would I set the impedance to on each VC. I don't know a lot about all this stuff and want to make sure I hook things up correctly. Thanks
1 Answer
Hi Mark, Unless you can verify that the receiver can handle the load, we don't recommend adding both volume controls. Typically 100W per channel receivers have as many outputs as speakers you can drive. Adding both VCs might put too much of a strain on it. Consider investing in a good amp like our AMP120 or the RX-4105 receiver to drive your additional set of speakers. CL/MA 1748
Submitted by: Customer Service - Q&A on April 2, 2013

from Cleveland, Ohio asked:
January 17, 2013
When using multiple volume controls with the on/off switch, can all be turned off at the same time? How is the speaker impedance affected?
1 Answer
Hi Robert, Most systems utilizing impedance matching volume controls are set up for worse case scenario where all zones are active. If you have four zones with a single pair of speakers per zone, your setting is 4X. If you turn off two of the four zones, you are still covered. Note, when you use impedance- matching volume controls with a speaker selector, you need to make sure the protection switch on the speaker selector is disabled (turned off, in the out position). Let the volume controls do the work. One of the disadvantages to the impedance-matching volume controls is you cannot turn them off at the volume control itself so even though you cannot hear anything once it has been turned down (counterclockwise), it still is absorbing energy and affecting the impedance. In this case, it is recommended to turn the volume control off at the respective zone of the speaker selector. If you are using the SVC205 in the zone, it features a on/off button that totally disconnects the signal right at the volume control. With our high current amplifiers like the OSD200 or OSD300, you can set up your impedance settings at a lower value (2x for four pairs as an example) so you actually increase your audio output. Utilizing the SVC205 volume controls will be best for any application versus the standard SVC models. Good luck! TL/MA - 1551
Submitted by: Customer Service - Q&A on January 20, 2013

from Tucson asked:
January 9, 2013
Can I used this product outside if I put it in a watertight enclosure?
1 Answer
Hi Ben, You can use this volume control outdoors but you’ll need a waterproof box, such as this unit we offer. CL/MA1523
Submitted by: Customer Service - Q&A on January 9, 2013

from Chicago, IL asked:
May 23, 2012
I just purchased two of these and can't seem to locate the impedance match jumper referred to in the description. Where is it on this SVC205 model?
1 Answer
Hi Bill: The setting switch is located under the Knob. You need to remove the knob and then loosen the nut. You have choice of 2/4/8, set it to the desired setting then tighten the nut and put the knob back. TL
Submitted by: Customer Service - Q&A on May 23, 2012

Shawn Goodspeed
from Maryland asked:
May 1, 2012
I am looking to hook up 2 zones each with it's own SVC205. Do I have to run through a speaker selector out of the receiver or can I just wire both into the back of my receiver into the same B speaker terminals. Thanks for any help.
1 Answer
HI Shawn: The SVC205 will work perfect for your application. There would no problem connecting both zones in parallel to the B output of your receiver. Set the impedance matching to 1/2x on each of the Volume controls. The SVC205 will provide the ability to shut off each zone at the volume control, no need for a speaker selector. TL
Submitted by: Customer Service - Q&A on May 2, 2012

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