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Home / Product Category / Whole House Audio / Volume Controls / In-Wall Volume Controls / OSD Audio VMS300 300-Watt Decora Style Speaker Volume Control Kit with Soft-touch Slider, Impedance Matching and White, Ivory and Almond Colored Plates

OSD Audio VMS300 300-Watt Decora Style Speaker Volume Control Kit with Soft-touch Slider, Impedance Matching and White, Ivory and Almond Colored Plates

Product code: OSD-VMS-300

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OSD Price: $29.95
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Features & Specifications

An installer favorite, the VMS300 volume control is rated at 300 Watts peak and gives you the convenience of controlling volume independently in each room. We include a lot of product shots because we want customers to see the build quality inside and out of this decora-style controller with 12-step linear slider. Quality is critical to the successful sonic performance of any whole house audio system and we pay close attention to performance, reliability and durability. The result is a blend of transparency and functionality, with low distortion and ruler flat frequency response. OSD Audio Volume control delivers seamless control for every room in the house and whether you choose knob control or soft-touch sliders, you’ll enjoy convenience, style and colors to match any decor.

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

Designed for whole house audio systems, the VMS300 is a heavy-duty but elegant impedance-matching volume control that offers the same features of volume controls that cost twice as much and is a nice upgrade from outdated rotary version volume controls. Rated at 300 Watts peak with minimal bass roll-off, the VSM300 includes adjustable jumpers to add up to eight pairs of 8-ohm speakers simultaneously depending on what type of load your amp can handle, and the impedance-matching feature helps stabilize the ohm load going back to the amp or receiver to avoid overheating. This is a complete volume control kit that fits into a standard single-gang box and includes the VC, junction box, screws and assorted color trim plates (white, ivory and almond) so you can choose the color that best matches the room. Compatible with almost any dedicated audio zone or whole house system, the electronics inside the VSM300 are designed with precision and a ruler-flat frequency response while the 12-step slider provides noise or pop-free volume control and a wide range of listening volumes.

Why Is Impedance Matching Important?

Impedance is a somewhat complicated topic but in general terms it is a measurement of resistance to alternating current. Speakers are specified by impedance, and a common value 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. Volume controls such as the VMS300 have selectable impedance so you can literally 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. 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.


Volume Control 101

It's important to know a few facts about Volume Controls. There are two types of volume controllers we offer; Impedance matching and Non-impedance matching. A basic multi-room system will typically have an amplifier/receiver, a speaker selector, 4 to 8 pairs of speakers, and volume controls. In a basic system multi room system a Speaker selector is used to organize the connection between the Amplifier/Receiver where the Speaker Selector typically has internal impedance protection that is controlled by a manual switch. More complex multi-room systems often add Impedance matching Volume Controls for each room/zone. The Impedance matching Volume Controls feature three settings depending on how many speakers you are connecting. 1 to 2 pairs of 8 ohm speakers the setting is 1/2x. For three or four pairs of 8 ohm speakers the setting is 4X In fact, when adding impedance matching, you must turn off (disable) the protection in the speaker selector. 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. Also remember that 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.


  View Owner's Manual            Product Information


15 Questions & 15 Answers
from St. Louis, MO asked:
January 9, 2016
Can two VMS300 units be mounted in a double gang box? If so is there a cover plate for that?
1 Answers
Hi Kent: The VMS 100 fits in a standard Decora plate. Two will fit in a double gang box so you can purchase an off the shelf Dual gang Decora plate to fit. There are slight differences between over the counter plates so checkout a couple of stores and compare. TL/3655
Customer Service - Q&A
on January 22, 2016

from brunei asked:
December 7, 2017
does it come with j box?...
1 Answers
Hi Rashid: This does not come with any outer box but will fit into any standard J-Box at least any J-box here in the US. TL/4682
Customer Service - Q&A
on December 7, 2017

from Orlando, fl asked:
May 30, 2017
I have a 4 zone setup with 1pair of 8ohm speaker connected to a vms300 set at 4x in each room. I'm using a spw8 speaker distribution to a nIles amp si-245. Source is the pre out from zone 2 on a onkyo receiver. I've checked all wiring but the amp will go into protection mode if pushing the speakers. Is the 4x setting correct?
1 Answers
Hi Mike: The Volume Control setting sounds right, the Niles Amplifier is a high current design that should not have an issue with the load. The Spw8 patch bay is pretty straight forward on how it is wired. What are the four speakers you are using and what are their power handling and sensitivity specs? All I need is a Brand name and model number to check their specs. Is the Amplifier getting hot to the touch before it shuts down? Also check to make sure everything is wired in phase and there are no loose wires touching that might be causing a short. TL/4398
Customer Service - Q&A
on May 31, 2017

Nicholas Leavelle
from NYC asked:
May 11, 2016
I am installing a 70v system where i will have two zones. i will have 9 speakers. 4 speakers (zone 1) will be set to 60W. 5 Speakers (zone2) 4X60w 1X10W. I'm looking for a volume control unit (x2) for this setup. Can you confirm whether this item would fit the bill or possibly point me to something that would? Thanks for your time and assistance.
1 Answers
Hi Nicholas: The VMS-300 is an 8 ohm Stereo Volume Control that is not recommended for 70V system. We do have actual 70 Volt Mono Volume Controls specifically for 70V our MVC series. But I do not believe they will work in your setup as you have it configured. We have 25W, 50W and 100W. And I believe 100 watt is the highest rated available from any manufacturer. The same rules apply when trying to calculate your tap settings for multiple speakers for the rated power that is available. So as an example you have (zone 2) four speakers taped at 60W (240 Watts total) and one at 10W or a total of 250W. The rule of thumb is you want your speakers when totaled together need to be rated around 80 to 90% of total power available from your Amplifier. So your amplifier would have to be 280 to 300 watts minimum to power the five speakers of Zone 2. Zone 1 of your system would be four speakers at 60W or 240W so similar to Zone 2 fior power from your amplifier. Our OSD MVC Volume controls do have a unique feature where you have input and pass thru for connecting multiple Volume controls and speakers in Parallel from a single output. So the question for you is do you have additional Tap settings lower than 60W? Can you use multiple Volume controls in your zones? Please let me know more about your system, my contact info is And checkout our MVC100 70V Mono Volume Control. Would also like to know what speakers and amplifier you are using (Brand and model #) so I could be more helpful. Sounds like a good challenge... TL/3869
Customer Service - Q&A
on May 13, 2016

from Houston, TX asked:
June 2, 2015
Hey I just purchased 6 of these volume controls VMS300 from OSD. I am using them with the following setup and have questions that are in ALL CAPITALS. Can you please help me get this right? Onkyo TX-NR626 I will use the powered Zone 2 (115W per channel at 6OHMs safe) for the output into.... Monoprice 8 Channel Speaker Selector Only 6 channels will be used and the other 2 I will disable (not push the button in) SHOULD I DISABLE IMPEDANCE PROTECTION (not push the button in) ON THE SPEAKER SELECTOR? 6 VMS300 Volume Controls SHOULD I SET THE IMPEDANCE MATCHING AT 8x? 6 pairs Leviton SGC65-W 6.5-Inch Two-Way In-Ceiling Loudspeaker I believe that is a fairly regular routine setup? The only questions were if the speaker selector impedance protection should be disabled and also if the impedance matching on the VMS300´s should be set to 8x. How does OSD Volume Control accomplish this impedance matching? Because my math shows Resistance would equal 1.333 (6 times 8ohm circuit in parallel) Thanks for your help!
1 Answers
Hello Steven, The volume control impedance matching will do a more efficient job than the speaker selector's impedance protection, but either would work. The main issue here is that you're running a potentially very low impedance load on a 6ohm limited receiver. Though the impedance feature will help stabilize the ohm load going back to the receiver, it doesn't mean it will be a matching 6ohm load. Tred carefully and keep a close eye on the receiver to check for over heating. Very common set up, although most of our customers are using our AMP300. You can run your receiver into the AMP300 as the source.
Customer Service - Q&A
on June 2, 2015

from Canada asked:
August 29, 2014
Hello there; Can i connect 3 speakers in parallel / 8Ohms for one zone and 3 speakers in paralel / 8 Ohms for onother zone with too separate volume controls. My amps connects A or B 6 - 16Ohms / A & B 12 - 32 Ohms. Thanks in advance
1 Answers
Hello Marcelo, These volume controls can handle up to 3 pairs of 8ohm speakers but your amp needs to be able to handle that type of load too.
Customer Service - Q&A
on September 3, 2014

from STL asked:
July 30, 2014
Can you hook up four speakers to one volume control. I have 4 speakers in each room....Thanks
1 Answers
Hi Justin, Yes, as long as your amp can handle a 4 ohm load. This volume control can handle up to 3 pairs of speakers as long as the amp/receiver can handle it.
Customer Service - Q&A
on July 30, 2014

from Philly asked:
April 26, 2014
Trying to use 2 of these on a single stereo channel pair of outputs off an amp to power 2 indoor and 2 outdoor speakers for 2 zones (stereo in each zone). I think a switch would be redundant since u can just turn down either slider to essentially turn off a zone. The amp will only do as low as 8ohms per channel. Based on what ive read, it sounds like the amplifier side of these transformers is only 8ohms. The issue is that if the amp side of the volumes are 8ohms, with 2 volume controls on each channel output, the amp would see 4 ohms. Each speaker is 8 ohms. Soooo, can i use the impedance matching to change the amp side and get each slider to show 16 ohms per channel, so that when there is two transformers wired in parallel, each channel on the amp is actually seeing 8ohms? I'm essentially just wiring the exact diagram in the manual that they come with, but its not clear on if the impedance matching function also can be used to adjust the impedance to the amp. Soo- 4- 8ohm speakers. 2- 8 ohm amp channels (1 left, 1 right). 2 zones, each with 2 speakers, 1 left, 1 right. And 2 volume faders, one for each zone.
1 Answers
Hi Pete, Good question. If the amp/receiver can only handle 8ohms, we have to be very careful. The volume controls will not show it a set impedance, so that wouldn't be a solution. Do you know the exact model number for the speakers you are using? Can you let me know? Most 8ohm advertised speakers are actually 16ohm per speaker but they advertise it as 8ohm, because they are expecting you to run it with another pairing speaker, which drops the load to 8ohms. If that's the case, then you should be safe just setting the volume controls to 1/2x. BM 2643
Customer Service - Q&A
on April 28, 2014

from asked:
January 19, 2014
I connected a pair of OSD Audio ACE840 to this volume controller. I then connected the outputs from the receiver (Denon AVR 1905) to the volume controller. When I turn on the receiver the setting on the volume controller needs to be set at the max setting to hear even a faint sound from the speakers. when I turn up the volume on the receiver the it then shuts down within several seconds. I'm pretty sure I have all of the setting correct. Can anyone please shed some light on what the issue may be?
1 Answers
Nik, I just answered your question on the ACE840 page, but it looks like I have the information I asked for here. It sounds like a defective volume control, but can you tell me what the impedance switch is set to on the volume control (1/2x, 4x or 8x)? -BM 2448
Customer Service - Q&A
on March 10, 2014

from Dayton, ohio asked:
March 8, 2013
Does this volume control work to completely mute a set of speakers?
1 Answers
Hi Jeremy, If the volume on your receiver is very high, even at the lowest setting on the VMS300 volume control, you could possibly hear sound. You can find a balance by turning the volume at the receiver lower. That way the lowest setting on the volume control is inaudible. Our SVC205 volume control includes an on/off switch; however, it is a knob style. CL/MA 1685
Customer Service - Q&A
on March 8, 2013

from Hunt, Tx asked:
January 24, 2013
Can I use the VMS300 with up to 4 speakers on one volume control. Then connect that volume control up to one of the inputs on a OSD DM6 speaker selector. Would I turn the impedance on or off on the speaker selector. Thank you for your help
1 Answers
Hi Brad, It's best to keep the number of volume controls equal so we recommend 6 volume controls on the DSM6. Set the volume controls to 8x and turn the protection OFF on the speaker selector. You do not want both components doing the impedance matching. We recommend letting the volume control handle it, especially since you plan on doubling up one zone. CL/MA 1577
Customer Service - Q&A
on January 24, 2013

from Regina SK asked:
September 26, 2012
I am hooking this up to a single pair of 8 ohm speakers and there is no need for a impedance matching. The specs, documentation and box all mention a 1x non-matched switched position but I don't see it on the unit. How do I set this unit to non-impedance match throughput?
1 Answers
Hi Curtis, There is a jumper inside the unit. It might not be shown in the picture but it is easily accessible during installation. By setting the VMS300 to 1/2x (the lowest setting), the impedance matching will not be in use. CL/MA 1309
Customer Service - Q&A
on September 26, 2012

from Arkansas asked:
July 4, 2012
implanning on buying a couple of these, im using a Sony 530watt 8ohm system w two speakers & a sub, but im gonna use these volume switches & add 4 more speakers thorughout the house. how would you suggest wiring it? each switch will have 2 speakers, each @ 6-8ohms. wopuld i just use it as impedence matching for 8ohms or how would you suggest? the system im using isnt able to add speakers to it because it doesnt have actual speaker ports, thier just custom style conenctors, so im just gonna cut off the speakers & run the stereo directly into my wall jacks & then add speakers to each box in the individual rooms.
1 Answers
Hi Mike, We would recommend adding a speaker selector to your system like the ISS4 with 4 volume controls, one for each zone. Its important for the stability of the system to have a volume control per zone. All of the speakers would have a direct line to the speaker selector and this would be connected to your Sony receiver as if it were a pair of speakers. (one right and one left) Secondly, how is your sub connected? Is it connected to a set of satellite speakers? CL
Customer Service - Q&A
on July 6, 2012

from Seattle, WA asked:
June 21, 2012
Hi - is it possible to replace the white decora panel with a stainless steel decor panel, or are the decora panels specially designed for the control? And is that the same answer both on the slider and rotary knob designs?
1 Answers
Bill, You should be able to find the knob style- chrome face plate easily. Although the slider style face plate is specifically designed for the unit, you might or might not be able to find a stainless steel panel that will accommodate that style. Cl
Customer Service - Q&A
on June 25, 2012

from Chicago, Illiniois asked:
May 23, 2012
I have a pair of 8 ohm outdoor speakers wired in parallel to one channel of a QSC GX3 so that the load is down to 4 ohms. One speaker faces into a neighbor's yard and I would like to be able to turn that one quieter than the other speaker on that line, would this volume control work for this without upsetting the 4 ohm impedance load on the amplifier? Or do you carry another product that would be acceptable for that application?
1 Answers
Hi Matt, Are you wiring it as a bridged mono output? We are going to offer a dedicated mono volume control, but it will be about 60 to 90 days before these units are available. You can use VMS300 volume control, but you'll need to connect to a single channel (either right or left) before you connect to the amplifier and the second speaker in parallel in to the QSC. Set the VMS300 to 2x setting on the impedance Matching switch. The Amplifier should have no problem. CL/MA
Customer Service - Q&A
on May 24, 2012

Product Reviews

8 Reviews
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63% Recommend this product (5 of 8 responses)
By Steve
Kingwood, TX
June 1, 2016
Great product
Easy to install, works great, shipping was fast.
By Dean
Houston, TX
August 13, 2013
Great for a Pair of Outdoor Speakers
Was considering another recommended pominent brand volume controller that cost $100 MORE. I couldn't see paying that much $$$ for a simple volume controller that is used occasionally for a pair of outdoor speakers. So, I gave this controller a try and it worked perfectly for my application.
ProsLower cost than other brands.
By Ryan
Calgary, Alberta
May 16, 2013
As expected
Shipping was very fast, and the product is exactly as described. Works great.
By Mark
North Texas
March 28, 2013
Very pleased
This is a solid device! It was very easy to install and works great, came with 3 color options in the box, I could not be happier.
ProsNice removable wire connectors make it easy to wire and then plug in to module.
By Bill
Roseville, CA
June 15, 2012
Well worth it....
Really didn't want to install volume controls in each room but the OSD rep talked me into it, so glad they did. It really wasn't hard to do and well worth the effort. My wife has been asking for whole house audio for years. Finally got up in the attic and pulled the wire. The inwall speakers and volume controls had great instructions and were so easy to install. The controls are large so use a backless low voltage or extra deep box. Thanks OSD.
ProsEasy To Set Up, Quality Construction, Easy To Use
By Steve
May 12, 2009
Excellent price and ...
Excellent price and quality. Used Russound in the past but these are even better. Will buy from them in the future.
By Ed
October 27, 2008
Everything seemed pretty ...
Everything seemed pretty easy and the ordering process played out exactly as expected. Ordered device (a speaker volume control) arrived in about 6 days and installed and functioned like it should have. Would likely use this merchant again for similar purchases.
By Mike
February 20, 2007
Same quality and finish ...
Same quality and finish as the Niles models I usually purchase.