Speaker selector plus volume control- why double protection? - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 6 Old 08-18-2019, 10:27 AM - Thread Starter
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Speaker selector plus volume control- why double protection?

Bought a house with a push button speaker selector (with matching) PLUS on-wall volume controls that are impedance matching.

Doesn’t this mean that the speakers are doubly protected? Why didn’t they just use a junction block if they were going to use “matching”-type volume controls?



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post #2 of 6 Old 08-18-2019, 10:44 AM
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Not sure what you mean by double protected.
The switch selects which speaker lines get any output.
The wall pots change the volume for that zone.

Ideally you get rid of both and put a modern whole house audio matrix and get rid of the switch and the pots.
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post #3 of 6 Old 08-18-2019, 12:09 PM
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Quote:
Originally Posted by smoothtlk View Post
Not sure what you mean by double protected.
The switch selects which speaker lines get any output.
The wall pots change the volume for that zone.

Ideally you get rid of both and put a modern whole house audio matrix and get rid of the switch and the pots.


he meant speaker impedance matching protection
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post #4 of 6 Old 08-18-2019, 03:16 PM
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I used that IM-SS box. Not familiar with IMVCs.

Might have just been an oversight. Check the instructions on the VCs.
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post #5 of 6 Old 08-19-2019, 09:16 AM
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post #6 of 6 Old 08-19-2019, 11:43 AM
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I have been asking this question for years. I'm not entirely sure I've received a satisfactory answer and certainly have never found a link that properly explains things. The link above is one of the better ones, but doesn't explain, at all, why a impedance matching speaker selector is needed.

Generally, I think of the impedance matching volume controls as calculating the number of pairs of speakers connected the volume control to present an 8-ohm load to the speaker selector. So, one pair of speakers: 1x, 2 pairs of speakers, 2x, etc. Then you set all your volume controls to the speakers connected to them, not the entire system. Let the impedance matching speaker selector handle the rest. It will auto configure depending on how many speakers are currently active on the selector itself.

Not sure if that's right, and I'd love to speak to someone directly at some point about it.

I do get the concept of a bunch of volume controls being set to the entire system, but it seems to me that it would continuously attenuate volume across the system and lower audio quality.

It also confounds me that when you go to non-impedance matching volume controls that they suggest that you don't use a speaker selector.

*sigh*

This is what I get for using one amplifier channel per speaker for all of these years.

AV Integrated - Theater, whole house audio, and technology installation in the Washington DC metro area.
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