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Help with speakers setup

post #1 of 9
4/13/11 at 6:51am
Thread Starter 
I've just bought an amplifier which has output specifications as follows:
20Hz to 20KHz, 8ohm - 65Wx2
1KHz, 4ohm - 90Wx2
Max power, 8ohm - 100Wx2
Max power, 4ohm - 120Wx2
Peak power, 8ohm - 560Wx2

I want to connect 3 pairs of in-ceiling speakers to it.

1 pair will be in a room. The other 2 pairs in another room. The amplifier can control the volume for the channels independently.

I was thinking of using the following setup:
Room #1 - 1 pair of speakers (80W, 8ohm each speaker) - connect them in series (result 160W, 16ohm ???)
Room #2 - 2 pairs of speakers (80W, 8ohm each speaker) - connect each pair in parallel, then connect them in series (result 320W, 8ohm ???)

Is it ok?

Is there a better configuration?

Do you have suggestions for different speaker specifications?

Any help is very welcome!
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post #2 of 9
4/13/11 at 12:10pm
Thread Starter 
Bump...

Nobody?
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post #3 of 9
4/13/11 at 7:04pm
Quote:
Originally Posted by telmoabff View Post

I've just bought an amplifier which has output specifications as follows:
20Hz to 20KHz, 8ohm - 65Wx2
1KHz, 4ohm - 90Wx2
Max power, 8ohm - 100Wx2
Max power, 4ohm - 120Wx2
Peak power, 8ohm - 560Wx2

I want to connect 3 pairs of in-ceiling speakers to it.

1 pair will be in a room. The other 2 pairs in another room. The amplifier can control the volume for the channels independently.

I was thinking of using the following setup:
Room #1 - 1 pair of speakers (80W, 8ohm each speaker) - connect them in series (result 160W, 16ohm ???)
Room #2 - 2 pairs of speakers (80W, 8ohm each speaker) - connect each pair in parallel, then connect them in series (result 320W, 8ohm ???)

Is it ok?

Is there a better configuration?

Do you have suggestions for different speaker specifications?

Any help is very welcome!

Will the amp run stable down to 2 ohms? Check the owners manual. You might need to use a speaker switching device that controls the impedance. Make and model of the amp and speakers?
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post #4 of 9
4/14/11 at 5:38am
Thread Starter 
Quote:
Originally Posted by Espo77 View Post

Will the amp run stable down to 2 ohms? Check the owners manual. You might need to use a speaker switching device that controls the impedance. Make and model of the amp and speakers?

Why 2ohm? I don't get it. Channel A will be 16ohm and B 8ohm. Am I calculating something wrong?

Speakers: JBL SP6II
Amplifier: Pyle PPA140
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post #5 of 9
4/14/11 at 6:02am
Impedance matching Speaker selector
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post #6 of 9
4/14/11 at 10:38am
Thread Starter 
Quote:
Originally Posted by Dave1027 View Post

Impedance matching Speaker selector

Looks like a simple solution. And saves the concern of calculating impedances right... Also will fit up to 4 pairs of speakers...
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post #7 of 9
4/14/11 at 11:12am
Your impedance calculations are correct, but your power output is not. For room one you will be getting somewhere around 45W out of the amplifier channel or about 23W/speaker. For room two you will be getting 65W out of the amplifier channel or about 16W/speaker.

As impedance drops increases, power is reduced. You should be dividing the available power of the amplifier by the number of speakers, not multiplying them. You multiply the wattage of the speakers to come up with the amplifier power needed to run the speakers.

Depending on how sensitive the speakers are and how loud you need them to go, this may be enough. I would try wiring them up first to see if it will work before installing everything and finding out this will not work though.
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post #8 of 9
4/14/11 at 11:43am
Thread Starter 
Quote:
Originally Posted by Dave1027 View Post

Impedance matching Speaker selector

Thank you!
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post #9 of 9
4/14/11 at 11:45am
Thread Starter 
Quote:
Originally Posted by duc135 View Post

Your impedance calculations are correct, but your power output is not. For room one you will be getting somewhere around 45W out of the amplifier channel or about 23W/speaker. For room two you will be getting 65W out of the amplifier channel or about 16W/speaker.

As impedance drops increases, power is reduced. You should be dividing the available power of the amplifier by the number of speakers, not multiplying them. You multiply the wattage of the speakers to come up with the amplifier power needed to run the speakers.

Depending on how sensitive the speakers are and how loud you need them to go, this may be enough. I would try wiring them up first to see if it will work before installing everything and finding out this will not work though.

I hadn't thought about it. Although I think the speakers are sensitive enough I'd only be using around 20% of the speakers power. That's too little.

I'll give it more thought.

Thank you very much!
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