SKU: VMS-300-PAR
OSD VMS 300In Wall 300W Slider Volume Control, Speaker Impedance Matching (White, Black, Brown) Decora Style
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.
Features:
- 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
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: 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
View Product Information
28 Questions asked
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Kent • 12/17/2019, 2:17:43 PM
Can i just use one channel or do both channel need to be connected
Customer Service • 12/17/2019, 2:17:43 PM
Hi Kent:
Each channel has its own independent transformer so no problem connecting to just one channel or the other.
TL/5094
Jonathan parker • 12/17/2019, 2:17:43 PM
Could i connect 2 pair of LS3 speakers to this volume control. Can the volume control be conected to the center output on my 7.2 sony receiver. I only have one channel availble on my receiver.?
Customer Service • 12/17/2019, 2:17:43 PM
Hi Jonathan:
I order to answer this question I have a couple of questions for you. Are you using a volume control for the left and right front stage speaker as well? I am assuming you are asking about the VMS300 to control the impedance between the two pair of LS3 speakers. But it would be better to tie the LS3 to the Center Channel output wiring them in series-parallel so the net result is an 8-ohm load to the Receiver. I have attached an image showing the wiring of the four LS3 garden speakers in the series-parallel. It seems as if you were just buying a Volume control for just the center channel the series-parallel wiring would be your best option without spending more money. Let me know if I am missing something or if the image does not come through; tim@osdaudio.com
TL/5095
Jonathan parker • 12/17/2019, 2:17:43 PM
Could i connect 2 pair of LS3 speakers to this volume control. Can the volume control be conected to the center output on my 7.2 sony receiver. I only have one channel availble on my receiver.?
Customer Service • 12/17/2019, 2:17:43 PM
Hi Jonathan:
I order to answer this question I have a couple of questions for you. Are you using a volume control for the left and right front stage speaker as well? I am assuming you are asking about the VMS300 to control the impedance between the two pair of LS3 speakers. But it would be better to tie the LS3 to the Center Channel output wiring them in series-parallel so the net result is an 8-ohm load to the Receiver. I have attached an image showing the wiring of the four LS3 garden speakers in the series-parallel. It seems as if you were just buying a Volume control for just the center channel the series-parallel wiring would be your best option without spending more money. Let me know if I am missing something or if the image does not come through; tim@osdaudio.com
TL/5095
Mo • 12/17/2019, 2:17:43 PM
Do these work within a 70v system? Having issues with mine for some reason
Customer Service • 12/17/2019, 2:17:43 PM
HI Mo:
The VMS Series Impedance Matching Volume Controls are for 4 and 8 ohms applications, they are not for 70V. We have a line of 70Volt Volume Controls, three models; MVC100, MVC50, and MVC25. These are mono 70Volt with the unique pass-thru feature. We also have a 2 Zone Speaker Selector with individual MVC100 volume controls per zone (including pass-thru capability as well). There is a 30-day performance Guarantee
TL/5232
John • 12/17/2019, 2:17:43 PM
I have a question re: use of OSD Audio VMS300 with a niles SS-6 speaker selector with protection. I am running 6 pairs of 6-8 ohm speakers via this speaker selector and a VMS 300 VC controlling volume for each pair. I am confused as how to set the impedance matching on the volume control and the speaker selector. i am currently set at 16x with protection on. Is this overkill? What would you recommend with regards to settings? I can't find good information anywhere on this.
Customer Service • 12/17/2019, 2:17:43 PM
HI John:
Good question, you need to pick either the Protection from the Niles Speaker Selector or utilize the Impedance Matching Volume Controls to protect your Amplifier/Receiver. Typically the owners manual tells you to use the protection switch when playing 2 or more pairs at the same time. What it does not tell you is the power handling is cut in half when the internal protection is enabled. The primary reason for using Impedance Matching Volume controls is to provide protection for the Amplifier; a secondary function is to attenuate the sound level. So we find that the Impedance Matching Volume Control with it settings does a better job of protection. Note, the Impedance Settings; 1/2X, 4X, 8X and 16X refer to the number of 8-ohm speakers you will have connected in parallel. You have six speakers, so you pick the next highest setting, in this case, 8X for all six connected IMVC. 16X is too conservative, and you need to make sure the protection on the Niles is off/disabled/button not pushed in. The Protection on the Niles would be recommended if you were not using the Volume Controls at all or you were not using all zones (six of them for you). In that case, you would set each volume control you were using to 1/2X and let the speaker selector do the protection. So to summarise, you set all of your six Volume Controls to 8X and make sure the protection switch on the Niles Speaker Selector is off (no double dipping allowed). By the way, the Niles is a very good speaker selector.
TL/5267