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Old 27th May 2012, 07:46 PM   #1
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Default 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
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Old 27th May 2012, 07:48 PM   #2
Pano is offline Pano  United States
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Why a circuit breaker? Why not just a switch?
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Old 28th May 2012, 12:14 AM   #3
sreten is offline sreten  United Kingdom
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Originally Posted by Pano View Post
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.
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Old 28th May 2012, 05:50 AM   #4
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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?
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Old 28th May 2012, 06:55 AM   #5
Jay is offline Jay  Indonesia
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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.
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Old 28th May 2012, 08:50 PM   #6
dangus is offline dangus  Canada
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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.
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Old 28th May 2012, 08:52 PM   #7
sreten is offline sreten  United Kingdom
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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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