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Old 09-09-2009, 06:23 PM   #1
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Default Speaker ohms - how many am I using?

Sorry I know you have all explained this to me before but I still don't understand. Ok, the current speaker situation is 3x 8 Ohm surround speakers connected to my amp's 3 surround sockets (these can be ignored for now), but then my 2 Sony XB80AV speakers and my 2 ProSound 200W speakers. These 4 larger speakers are connected to the amplifier's stereo sockets (2 speakers per socket). I know this is overloaded but I can't afford a new amp. Each speaker says on the back of it that it is 8 Ohms but I have no idea is this is per speaker or per set of 2. The amplifer says it can take 8-16ohms in these sockets and doesnt appear to be getting hot even at full volume, but I think the speakers are greatly underpowered, I'm sure the amp is only 100W per channel. So I was wondering if anyone could help me work out the resistance and how badly underpowered the speakers are? Thanks
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Old 09-09-2009, 06:58 PM   #2
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Default Re: Speaker ohms - how many am I using?

to see if u can hear if the speakers are under powerd, just put 1 speaker in each channel, instead of the 2 that are there now, and see if u hear a difference, if 1 speaker sounds better, then the 2 speakers are bringing down on the quality.

And if the speaker says it is 8 Ohms, then just that speaker is 8 ohms, not the pair, it is 8 ohms PER speaker.

the reason for the 8-16 ohm rating, is because there are 8 ohm and 16 ohm speakers out in the world.

http://www.ehow.com/how_2036409_speakers-8ohm-load.html

if speakers are put in series, they hafto add up to 16 ohms max for your amp to power them right, (2 speakers hooked together in series gives u 16ohms)

if speakers are put in parallel (only for 16ohm speakers mostly) there impedance is the same, so you take 16, then divided by 2 and u get 8ohms resistance.

so for instance if u put 2 8ohm speakers in parallel, u'll get a total of 4ohms impedance, which is to little to get the full bit of sound, speakers work best at 8ohms, especially if it is a mid range speaker.
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Old 09-09-2009, 07:40 PM   #3
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Default Re: Speaker ohms - how many am I using?

Just use one pair of speakers for your mains. You're dropping your impedance levels down to 4 ohms, which your amplifier can't handle.

Quote:
Originally Posted by sniperviper21 View Post
so for instance if u put 2 8ohm speakers in parallel, u'll get a total of 4ohms impedance, which is to little to get the full bit of sound, speakers work best at 8ohms, especially if it is a mid range speaker.
This is full of baloney.
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Old 09-09-2009, 08:09 PM   #4
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Default Re: Speaker ohms - how many am I using?

who has the degree in Electronics here?

Me, thats who.


http://www.play-hookey.com/dc_theory...resistors.html

(parallel) Rt(total) = (1/R1) + (1/R2) + (1/R3) + ect... /1

so..

if R1 = 8Mohs R2 = 8Mohs

Then
Rt = (1/R1) + (1/R2) =
Rt = (1/8) + (1/8) =
Rt = .125 + .125 = .250
Rt = 1 / .250 = 4
Rt = 4Mohs (ohms)


Additional Proof

http://www.sengpielaudio.com/calculator-paralresist.htm
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Old 09-09-2009, 08:18 PM   #5
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Default Re: Speaker ohms - how many am I using?

I meant this quote.

Quote:
speakers work best at 8ohms, especially if it is a mid range speaker.
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Old 09-09-2009, 08:20 PM   #6
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Default Re: Speaker ohms - how many am I using?

thats not the retarded piece of meat u stated it to be,

if hes using 8ohm speakers, then of course they would work best at 8 ohms.

i did not infer that ALL mid range speakers work best at 8ohms, just the ones he mentioned specifically do.
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Old 09-09-2009, 08:25 PM   #7
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Default Re: Speaker ohms - how many am I using?

It doesn't matter what the impedance levels are, as long as they are within the levels specified by the amplifier's manufacturer.
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Old 09-09-2009, 08:27 PM   #8
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Default Re: Speaker ohms - how many am I using?

I guess.

IMO i'd rather use speakers at there rated value, as long as they are with tolerance of the amp or audio driver.
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Old 09-09-2009, 08:29 PM   #9
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Default Re: Speaker ohms - how many am I using?

So what is this quote all about?

Quote:
so for instance if u put 2 8ohm speakers in parallel, u'll get a total of 4ohms impedance, which is to little to get the full bit of sound, speakers work best at 8ohms, especially if it is a mid range speaker.
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Old 09-09-2009, 08:32 PM   #10
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Default Re: Speaker ohms - how many am I using?

?_?

the load is to little, like....4 < 8 ? lol

and the speakers impedance is 8, so to ME, it wouldnt get the full load of the signal, the impedance isnt high enough to soak up all the current/voltage.

but w/e
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