What happens if you wire 2 amps into 1 speaker? - AVS Forum
Audio Theory, Setup, and Chat > What happens if you wire 2 amps into 1 speaker?
joker97's Avatar joker97 05:08 AM 05-25-2009
Ok i might be stupid but i'd like to know what could potentially happen -

If i have one speaker for rear surround. And i wired the Rear L AND the Rear R to that ONE SPEAKER, what will happen? (note assuming i'm not playing it loud at all, just normal volume, eg if i turn down the volume on both outputs)

1) Speaker blows
2) Amp(s) blow(s)
3) No damage but weird/distorted sounds
4) Other - (what?)

Would really like to know, so - yeah thanks!

brandonnash's Avatar brandonnash 06:02 AM 05-25-2009
So you mean two channels of an amp or receiver? I wouldn't recommend it either way. There is potential for damage to the speaker and possibly the amp. Now what the likelyhood is I don't know. If it is a 5.1 receiver you are running just change your settings to 4.1 or simply buy an extra surround speaker. That's what I would do. Get the full experience.
tvrgeek's Avatar tvrgeek 06:24 AM 05-25-2009
You blow up at least one amp.
JHAz's Avatar JHAz 09:12 AM 05-25-2009
What tvr geek said. You would be wiring the outputs of the 2 amps into each other, as well as into the speaker. Nothing good can come of that.
ChrisWiggles's Avatar ChrisWiggles 12:06 PM 05-25-2009
Do NOT do it. Fire, damage the amps, etc are likely to occur.
duvetyne's Avatar duvetyne 12:15 PM 05-25-2009
Quote:


i'd like to know what could potentially happen

You're connecting the outputs of two power amps together. If one amp is outputting silence, a 0V signal, and the other is at a peak (eg. 28V), you'd effictively have 28V across a short circuit, resulting in 'infinite' current flow, and a dead amplifier.
joker97's Avatar joker97 12:56 PM 05-25-2009
ok, that makes sense! amp-amp wiring = badness.
nope was never planning to do it, just wanted to get this off my chest!

thanks
Drew Eckhardt's Avatar Drew Eckhardt 02:55 PM 05-25-2009
Quote:
Originally Posted by tvrgeek View Post

You blow up at least one amp.

Modern amplifier designs have over-current protection and just shut down. Reasonably built simpler amplifiers have fuses on the power supply rails that will blow so you might be replacing two or four fouses. Only poorly built amplifiers will actually fail.
Rutgar's Avatar Rutgar 08:49 AM 05-26-2009
Years ago I was experimenting with bi-amping. I was checking for polarity by reversing the speaker wires at the speaker terminals with both amps on. I accidently touched the connector from amp to the connector of the other amp... BOOM! I blew the main circuit breaker in house, and ALL of the output transisters as well as some other circuits in both amps. Very expensive 'slip'. I eventually got the amps fixed. But they were never the same after that.
Ratman's Avatar Ratman 09:15 AM 05-26-2009
Quote:
Originally Posted by Rutgar View Post

I accidently touched the connector from amp to the connector of the other amp... BOOM! I blew the main circuit breaker in house...

Really?
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