SKU: VMS-100-PAR
OSD VMS100In Wall 100W Slider Volume Control, Speaker Impedance Matching (White, Black, Brown) Decora Style
OSD Audio’s VMS100 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 VMS100 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 100 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 VSM100 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.
Features:
- Decora style impedance-matching volume control for whole house audio systems and dedicated audio zones
- Rated at 100 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 VMS100 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
Warning:
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 www.P65Warnings.ca.gov.
- Volume Control Type: 100W Impedance Matching Slider Style
- Power Handling: 100W Peak; 50W 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
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31 Questions asked
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Pete • 12/17/2019, 2:17:43 PM
I have one sonos system that controls three rooms, two adjacent on the first level and the third in the basement. The speaker selector is on the second floor of the house (three floors away from basement) and it is impedance matching. Since I can't turn off the impedance matching for just two zones on the speaker selector, can I turn it off on the volume controller? Just want this in basement so I don't have to have it on down there (bedroom in basement as well).
Customer Service • 12/17/2019, 2:17:43 PM
Hi Pete,
The VMS100's lowest setting would be 1/2x. Switch your volume controllers to this setting and this will disable the impedance matching so your speaker selector can take over.
CL/MA
MarkC • 12/17/2019, 2:17:43 PM
Since connecting the 2 Volume Controls to the Sonos ConnectAMP, I have noticed that the audible volume is lower than without the volume control connected and the ConnectAMP at the same volume as previous. What could cause this?
Customer Service • 12/17/2019, 2:17:43 PM
Hi Mark,
These are impedance matching volume controls, that does take away slightly (less than 10%) from the power handling the speaker receive. You should make sure the settings on your two volume controls are at the lowest 1/2x to minimize the power loss.
CL
MarkC • 12/17/2019, 2:17:43 PM
Since connecting the 2 Volume Controls to the Sonos ConnectAMP, I have noticed that the audible volume is lower than without the volume control connected and the ConnectAMP at the same volume as previous. What could cause this?
Customer Service • 12/17/2019, 2:17:43 PM
Hi Mark:
The primary function of an impedance matching Volume Control is just that, to control the impedance matching (mainly to protect the Amplifier/Receiver). This is a passive device that does not add any gain. In effect you are not turning the Volume up but Attenuating the Volume Down. As you turn the volume down the signal is diverted to the transformers causing a bit of a load that ultimately drains power or volume compared to when you use no volume controls. So you will find you need to increase the volume level of the SONOS to higher settings to achieve the same volume level that you get without the volume controls.
YL
JOSE CESPEDES • 12/17/2019, 2:17:43 PM
I have 16 units of your VMS-100 slider. How many speakers can control 1 VMS-100? My speaker is 20 watts to 100 watts 8 ohms.
Customer Service • 12/17/2019, 2:17:43 PM
Hi Jose,
Our volume controls have 4 inputs and 4 outputs, meant for a pair of speakers. One left and one right. The only way you can add more to one volume control is by wiring in parallel, which we don't recommend for the novice installer.
CL
jaime • 12/17/2019, 2:17:43 PM
My speaker RC 801 20 watts to 100 watts 8 ohms per channel, how many speakers this type can i control with one ( 1 ) VMS 100 slide volumen control ? please get back to me ASAP
Customer Service • 12/17/2019, 2:17:43 PM
Hi Jamie,
Our volume controls have 4 inputs and 4 outputs, meant for a pair of speakers. One left and one right. The only way you can add more to one volume control is by wiring in parallel, which we don't recommend for the novice installer.
CL