Setup 4 speakers on a stereo, impedance ? - AVS Forum
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post #1 of 7 Old 09-18-2013, 01:21 PM - Thread Starter
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Hi everyone,

Victor, 24 from France.

I have a quick question that has probably been asked thousands of times, and i've looked online but I still can't quite figure out if I can do what I wanna do.

I have a stereo that came with 2 speakers.

On the back of the stereo, impedance is, i quote : 4-16ohm.

I have two 3 ohm Speakers and 2 8ohm speakers.

Question : is there a way I can have all those speakers plugged in the stereo ?

Thanks in advance,

Victor

Edit : no idea why I said I was 24, I'm 26.
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post #2 of 7 Old 09-18-2013, 02:56 PM
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It's alright. I'm nearly 70 and I try to forget my age all the time. Putting two speakers on the same output will halve the impedance. So you would end up with a 4 ohm speaker and a 1 1/2 ohm speaker. Will that work? Maybe. Try it. Don't apply much power and see if the amplifier overheats. If it doesn't you will probably be OK.
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post #3 of 7 Old 09-18-2013, 03:42 PM - Thread Starter
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Thanks for the reply.

So :

On the left output, I plug in 2 speakers, one 8ohm and one 3 ohm, so impedance on the left is 4+1 1/2 = 5.5, which is in the range of my stereo (4 to 16 ohm).

So it should work. Unless calculations should be made per speaker instead of what I jus did, per output......

I'll try tomorrow, speaker by speaker...slowly, gently...
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post #4 of 7 Old 09-18-2013, 03:47 PM
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Two 8 Ohm speakers in parallel will result in a 4 Ohm load.
Two 3 Ohm speakers in parallel results in a 1.5 Ohm load.
An 8 and a 3 in parallel results in a 2.2 Ohm load.
Safest bet is to put an 8 and a 3 in series for an 11 Ohm load.
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post #5 of 7 Old 09-18-2013, 03:50 PM - Thread Starter
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Alright thanks !

Just to be sure, in series = plug 2 reds in the red socket, and 2 blacks in the black socket. And same on the right output. Correct ?
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post #6 of 7 Old 09-18-2013, 03:54 PM
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No.
In series, plug the red from one 8 Ohm speaker into the red socket, plug the black from one 3 Ohm speaker into the black socket, connect the black form the 8 Ohm speaker to the red on the 3 Ohm speaker.
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post #7 of 7 Old 09-22-2013, 03:45 PM - Thread Starter
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Just did that, works fine. Good power, no overheating after 5-6 hours a mid volume. Thanks thanks guys
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