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livefast28 27th May 2012 07:46 PM

switching between speakers
Hi there.
I have a problem with my stuff.
Currently bought new power amp and PA speakers.
The amp has only left and right side output.
I've got 4 speakers, was planning to wiring them in paralel .
but i need to be able to switch off 1 pair speakers while other pair stay attached to the amp.
My idea would be a 230v/ 30 A circuit breakers .... so when the breakers are off the amp loaded with 8 ohm each side ( 1 speaker in each side) , but when the breakers are on ( system turned off) the load would be 4 ohm ( 2 speakers on each side).

My question is it a reasonable setup???

Cheers for the answers

Steven K

Pano 27th May 2012 07:48 PM

Why a circuit breaker? Why not just a switch?

sreten 28th May 2012 12:14 AM


Originally Posted by Pano (
Why a circuit breaker? Why not just a switch?

hi, x2, and you don't need to turn the system off to use it, rgds, sreten.

livefast28 28th May 2012 05:50 AM

Why circuit breakers, because if i counted well the the amp will produce 775 w/ channel at 2 ohm as 40V/20amp. or 525w/ channel at 4 ohm as 45v/12amp, or 300w/channel at 8 ohm as 30v/7 amp.
So i trying to cover all the possibilities. couldn't find a decent and cheap switch as could handle max 50 volt/30 amp.
might i am wrong ! what kind of switch you recommend Pano?

Jay 28th May 2012 06:55 AM

You need a specially interconnected DPDT switch. You may also need a power resistor (at least 30W). I think this is the most common commercial speaker selector scheme out there. But for DIY, I think relay-based selector is doable. There is some electronics (hence power supply and IC) included tho.

dangus 28th May 2012 08:50 PM

Automotive relays (Bosch type) have high current ratings, and they're free if you can find an abandoned car. Also check out the electrical section of an autoparts store; maybe you'll find a suitable switch.

IIRC switches are rated on the worst case of switching at full current and voltage without triggering a continuous arc. That doesn't apply if you're not going to be switching speakers in and out while playing full-volume sine waves, so a more modest voltage rating should be OK.

sreten 28th May 2012 08:52 PM


the switch only has to handle one pair of the speakers, i.e. switch
8 ohm. I assume you meant 50V at 7A, 110V AC 10A should be fine.

rgds, sreten.

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