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True facts about ohms

post #1 of 44
Thread Starter 
I hear so many stories about this but I need to know the true facts about if it is perfectly fine to connect just one pair of 4 ohms speakers to a 8 ohms stereo receiver. Are there alot of people here have done it and has no problems at all?
post #2 of 44
Your amp will attempt to produce more power against the lower resistance. If it's reasonably well built (and\\or your careful with the volume) then it should be good, if not it may overheat\\cause damage.

I'm running 6 Ohm's and on a hot day at high volume I've shut down my amp - overheat\\circuit protection would be a bonus if you have it.
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post #3 of 44
Thread Starter 
If you are inside a home with AC in the summer will a 4 ohms speakers still overheat the 8 ohms receiver? Like if the temp is around 75 will that still overheat the receiver? Since you said in a hot day it overheats but maybe if it's not that hot inside it should be ok right?
post #4 of 44
There's no way to know - it depends how its built, I had it pretty much turned up all the way so I was prolly asking for it. Its just a warning really, with lower ohm speakers than its rated for the amp can produce more power than its designed to which prolly means overheating if you use too much volume.
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post #5 of 44
Most well built recievers should handle a reasonable 4Ohm load without much difficulty. Ohm ratings are fairly misleading as impedance is never static. In reality, the impdance of the speaker will vary greatly depending on the frequency it's trying to reproduce. As such, quality recievers are already built to handle these variations and output the required current. What I would recommend is to play them quietly at first and build up the volume to see if you hear any distortion or if the amp begins to overheat. These are signs that the amplifier is unable to output the necessary current. If you experience either of these symptoms at reasonable listening levels DO NOT use the speakers as they could damage the amp. However, I would guess you'll be absolutely fine at normal volume.
Edited by Iceman23 - 6/17/11 at 11:31am
post #6 of 44
Thread Starter 
I noticed that just having the volume 30% from 0-100 is already loud and if I have it to 50% I will blow the speakers. But I usualy have is most around 30% which is kinda loud but I do notice that the receiver kinda gets little hot but nothin happens to it. If I have the volume at normal then it's only warm. So I guess I might be able to have it loud but just not super loud. If I had a more powerful speaker then maybe I can play it louder but then problely the receiver will overheat.
post #7 of 44
Thread Starter 
At most for my speakers I can have it upto maybe 45% but when I get around 50% or louder my speakers starts to distort since I am getting close to max power that the speakers can handle. My speakers aren't big so they don't go that loud as big 8in woofers or even 6in woofers. Measuring by the frams it's around 5in but the moving part is only 4in. So it's very compact studio speakers. I have the JBL Control 1.


Also the SK3 lamp lights up and letting me know I have it too loud and if I turn it more louder than the lamp will burn out it's like a fuse then I will have to replace the SK3 lamp.
post #8 of 44
Keep the volume less than 50% and I think you got nothing to worry about - remember that rating is not constant - its peak. Just stay away from peak load, put your hand around the amp to make sure its not crazy hot (expect to be around 100-140F...180+ is too much, and very very hot to touch)
IMO you're fine
 
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post #9 of 44
Thread Starter 
Well how do I know what temp is the receiver exactly? All I can say is that when I have it loud it does get hot but I don't know how hot is too hot. I do know that I don't smell anything burning or see anything melting. Since if it was too hot would you smell something burning bad?
post #10 of 44
Well typically if you smell burning, its too late lol


Like I said, find the amp, make sure there's decent amount of space around it (I left 12 inches between the back of my 5000W amp and the wall for my home theater system) just so the hot air has room to move

If you dont know where it is, find the heat source and make sure it can breathe... if it doesnt seem very specific, or you have a large case with no apparent blowhole for heat... just give the unit room - dont shove it in a cabinet
 
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