TVs & Home Theaters forum


a/b selector switch in reverse?

by houseman9 / June 19, 2012 10:47 PM PDT

This may sound stupid, but I need to use my rear channel surround speakers as my "b" speakers as well. I would like to use the multiple outputs on the speaker selector (add on box) for the "input" and the "input" on the speaker selector box as an output (since there is one line in on the box). This would be so I could alternate between surround and the "b" usage on my receiver. Has anyone tried this? Are there any guards against using one this way. I have not purchased the selector box and would appreciate any advice on one less than $100. I have seen them on amazon from 35-85.

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Clarification Request
why don't you post the products you are looking at?
by Pepe7 / June 20, 2012 3:51 AM PDT


All Answers

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No model number
by mjd420nova / June 20, 2012 5:02 AM PDT

I will hazard a guess that the receiver/amp is a surround unit with front and rear outputs. labeled A and B. The surround output is directed to the B speakers for the effect and reverts to A and B when surround sound is not enabled. If this isn't the case, the surround function is by another source, then some switch would be best but care needs to be taken not to affect the impedance of the speakers and the contact surface area of the switch you use. I've seen more than a few that got overloaded and burned the speakers too.

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Good point. Let's try some math.
by R. Proffitt Forum moderator / June 20, 2012 5:26 AM PDT
In reply to: No model number

Let's say those speakers are 200 Watts. And 8 ohms (this is just so we can do the math.)

I get 25 Amperes. This means that switch should be about the size of a 20 or so Ampere switch you see in your average AC Mains panel.

No average switch will do for this work!

And we didn't cover make before break or break before make as well as advising never to switch this when the Amplifier is on!

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Personally I probably just buy another receiver instead.
by ahtoi / June 20, 2012 1:22 PM PDT

Which would be lot more versatile then try using the surround connections. I just bought a Denon (5.1) for $139. So just keep alert. You could pick one up on the cheap. Good luck.

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I guess I should have been more specific.
by houseman9 / June 27, 2012 2:07 AM PDT

The receiver is a Yamaha rv-1105 with outputs for rear surround and "b" speakers separately. I intended to use the "effect off" (no surround) with a + b speaker selection (front and rear) with music only. I wanted to use my surrounds when I play movies. Since the 12 gauge wire to the rear speakers is a long run, I just wanted a simple way to switch between cd's, mp3's, and watching movies. Thanks for all of your posts.

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