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    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

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    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?

    justin • 12/17/2019, 2:17:43 PM Can you hook up four speakers to one volume control. I have 4 speakers in each room....Thanks
    Customer Service • 12/17/2019, 2:17:43 PM
    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.
    marcelo • 12/17/2019, 2:17:43 PM 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
    Customer Service • 12/17/2019, 2:17:43 PM
    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.
    antony • 12/17/2019, 2:17:43 PM i have a pair of 8 ohm speakers with this volume control. if my receiver is 4 ohm or 6 ohm capable how do i set up the volume control and will this setup work
    Customer Service • 12/17/2019, 2:17:43 PM
    Hi Antony, You don't need an impedance matching volume control, but if you use ours it would be best to set it to 1/2x.
    Steven • 12/17/2019, 2:17:43 PM 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 VMS300s 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!
    Customer Service • 12/17/2019, 2:17:43 PM
    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.
    Bill • 12/17/2019, 2:17:43 PM What is the RMS power rating?
    Customer Service • 12/17/2019, 2:17:43 PM
    Hi Bill, RMA would be 150w per channel