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

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.

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?

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.

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.

Hi,

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.