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# Re: Impedance match help please

I am currently installing a multi-room audio system and have a question regarding impedance matching. I will have three rooms each with two 8 ohm speakers. Each room will be controlled with an impedance matching volume control. Based on this scenario (a total of six speakers), should the impedance match on the volume controls be set to 4x or something different. Is anyone aware of an article that explains the method to calculate this?

Thanks for any input you can provide.

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I believe you want it on the 8 setting. I use truaudio vc's and they clearly state in the instruction manual. For most equipment you want to stay between 4 and 8 ohms. So figure out what impedance your speakers are and check the manual and you shouldn't have any problems. If you run the impedance to low then you could cause damage to you amp.
Here is the accepted formula for calculating your switch settings:

Speaker Impedance
------------------------------------------------ = System Impedance
# of speakers connected to channel

Amplifiers Minimum Impedance Rating
------------------------------------------------ = Impedance Jumper Setting
System Impedance
Thanks for the responses. I used the formula above and came up with 6.1. Does this mean to set the jumper to 8 or 4? My amp is a denon 3806.

Thanks again.
6.1 ???

How many speakers?
What impedance?

If it is 6.1 use the 4 ohm.
It should be set to 4x. 1 pair = 1x, 2 pair = 2x, 3 or 4 pair = 4x, >4 and <9 = 8x (assuming 8 ohm speakers). Basically double for 4 ohm speakers.

Brian
Thanks to all of you for your responses. Let me tell you what else I have found. I found another manufacturer's instructions for a similar volume control that said 6 8ohm speakers should yield a jumper setting of 8x. I say similar volume control, but I do not know that they are the same. I also asked the retailer help desk where I purchased the volume controls and their response was to set it to 8x.

Any other thoughts or suggestions? Should I try 4x and see if the receiver gets hot?

I really appreciate the help all of you on this forum provide.
Like I said in my post (above), more than 4 and less than 9 (in your case 6)= 8x

Brian

Quote:
Originally Posted by sacker8472

Thanks to all of you for your responses. Let me tell you what else I have found. I found another manufacturer's instructions for a similar volume control that said 6 8ohm speakers should yield a jumper setting of 8x. I say similar volume control, but I do not know that they are the same. I also asked the retailer help desk where I purchased the volume controls and their response was to set it to 8x.

Any other thoughts or suggestions? Should I try 4x and see if the receiver gets hot?

I really appreciate the help all of you on this forum provide.
Sorry Brian. I understood you to be saying set it at 4x in your prior post. 8x is unanimous now.

Thanks again.
Now I reread your post. 6 pair would be 8x, but 4x is the correct recommendation for 3 pair--sorry for the lack of clarity.

Brian

Quote:
Originally Posted by sacker8472

Sorry Brian. I understood you to be saying set it at 4x in your prior post. 8x is unanimous now.

Thanks again.
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