Product Search

    Secure Checkout
    Your Shopping Cart Is Empty

    Secure Checkout

    SKU: VMS-300-PAR

    OSD VMS 300In Wall 300W Slider Volume Control, Speaker Impedance Matching (White, Black, Brown) Decora Style

    Purchase OSD In Wall 300W Slider Volume Control, Speaker Impedance Matching White, Black, Brown Decora Style
    • Outdoor Speaker Depot SKU: VMS-300-PAR vmheduimmasl
    • $38.44

      Compare at: $57.99
      You Save: $19.55

    • Color:  

    • Countdown Truck
      FREE Delivery by ,
      Order within hours and minutes
      Change Shipping Zip ? Free Shipping Over $50
      More Delivery Options

    Lifetime Tech Support


    Lifetime Tech Support

    OSD Audio’s VMS300 is an impedance-matching volume control for adjusting the volume of a pair of speakers within a whole house audio system. Ideal for dining rooms, saunas, porches or other areas of the house where you want to add sound, the VMS300 maintains the full hi-fi audio frequency response with no low frequency roll-off and is equipped with the same features of volume controls that cost twice as much. Rated at 300 Watts peak, the volume control includes adjustable jumpers to add up to eight pairs of 8-ohm speakers simultaneously, 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 a ruler-flat frequency response while the 12-step slider provides noise-free volume control and a wide range of listening volumes.

    • Decora style impedance-matching volume control for whole house audio systems and dedicated audio zones
    • Rated at 300 Watts peak with minimal bass roll-off
    • Impedance-matching helps stabilize the ohm load to avoid overheating
    • Accepts up to 14-gauge wiring and fits in a standard gang box with a depth of 2.9”
    • Includes junction box, screws and white, ivory and almond trim plates to match any room décor
    • Precision electronic design provides low distortion and a ruler flat frequency response
    • 12-step linear slider for pop-free control and a wide range of listening volumes
    • Installs easily and works with almost any audio system

    What Is Impedance Matching Volume Control?
    Impedance 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 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.

    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 Slider Style
    • Power Handling: 300W Peak; 150W RMS Per Channel
    • Frequency Response: 20Hz - 20kHz
    • Total Attenuation: 52 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 1X
    • 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, Ivory and Almond Plates, Inserts, Screws, and Slider
    • Additional Colors Available: Black or Brown
    • Warranty: 5 Years
    28 Questions asked
    Have a Questions?

    What's on your mind?

    Kent • 12/17/2019, 2:17:43 PM Can two VMS300 units be mounted in a double gang box? If so is there a cover plate for that?
    Customer Service • 12/17/2019, 2:17:43 PM
    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
    Nicholas Leavelle • 12/17/2019, 2:17:43 PM 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.
    Customer Service • 12/17/2019, 2:17:43 PM
    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
    Mike • 12/17/2019, 2:17:43 PM 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?
    Customer Service • 12/17/2019, 2:17:43 PM
    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
    ruby • 12/17/2019, 2:17:43 PM Hello, I bought 4 keypads for my setup from They are working fine but I notice that when I play some music with beat in it I can hear noise from my keypad. My keypad make loud noise of dum dum. Don't know why. The surprise thing is that my volume slider is only 25-30 of the volume. Don't know why I hear noise when I play music with beat and bass. Any way to fix it.
    Customer Service • 12/17/2019, 2:17:43 PM
    Hi Ruby: You need to contact our Customer Service department. They can help you out. TL/4620
    rashid • 12/17/2019, 2:17:43 PM does it come with j box?...
    Customer Service • 12/17/2019, 2:17:43 PM
    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