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Amp to multiple Cabs..

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Amp to multiple Cabs.. Empty Amp to multiple Cabs..

Post  Fuzzy Thu Jan 14, 2010 8:02 am

Noob question, but does an amp share it's power equally to whatever cabs are connected to it.
Say if you've got an amp putting out 500 watts, with 2 cabs hooked up to it, will it be sending 250 watts to each one?

I couldn't find an answer anywhere..
Fuzzy
Fuzzy


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Post  SuperMaximo93 Thu Jan 14, 2010 1:35 pm

Yes as long as both cabs have the same resistance. So when you have two 8 ohm cabs connected to one amp that outputs 500w into 4 ohms then each cab will have 250w (coz 8+8=4... bear with me here Razz)... There's some formula to work it out which I've forgotten which is useful when you have multiple cabs with different restistances, because if that happens then the watts for each cab are gonna be different
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Post  Dropthelines585 Thu Jan 14, 2010 2:39 pm

And also, if you have and 8 ohm cab and a 4 ohm cab there will be no difference, you will still be putting 250w into both cabs. Almost all speakers are either 8 or 4 so figuring for anything else is just a math lesson and not completely practical for the application.
Dropthelines585
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Post  Fuzzy Thu Jan 14, 2010 3:05 pm

Thanks Wink
On one of my many walks I was thinking.. what if you had an amp putting out 1000w into a 900w and 100w cab, it's still a 1000w load but would it fry the 100w cab?
Answer is yes.
Very Happy

It's the impedance of each cab multiplied by eachother, divided by the total sum of the amps' impedances.
For instance: two 8 ohm cabs would be 8X8=64, 8+8=16, 64/16=4

And only about 70% of the power gets through if you double the impedance.
A 500w amp @4 ohms will put out 250w into both cabs, but the 8 ohm cab will only get about 180w in the end.
Fuzzy
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Post  general lee Fri Jan 15, 2010 2:43 pm

That makes prefect sense! cheers
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