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Discussion in 'Amps and Cabs [BG]' started by Wxp4759cb, May 25, 2002.
750 watts @ 4ohms, is louder than 500watts @ 8 ohms right?
You are correct, sir, all other things being equal.
Both those ratings could come from the same amp! So in fact one might not be louder than the other - with the same 8 ohm cab, anyway.
Aint the layman's formula, if there's less ohms to push, the more wattage you can pump out? so, thusly should be louder, no?
The power difference between those two ratings is so small that you probably won't hear a volume difference assuming that the two cabinets are other wise equal.
I believe that the rule of thumb is that it takes twice the power to increase SPL by 3 dB which is the smallest volume change that humans can generally hear (yes, there are exceptions).
And, said amp would certainly run hotter at 4 ohms than at 8...which isn't a good thing.
Well I currently have an 8ohm goliath III. It still has 25 days to return it. My power amp puts out 500 watts at 8 ohms, or 750 at 4 ohms. Adding another cab latter will not give a 4 ohm load b/c the amp uses 2 seperate channels. Should I switch the cab for the 4 ohm (free), or keep the 8 ohm.
You should buy 3 more 8ohm cabs
If you daisy-chain two 8-ohm cabs, you'll have four ohms. In answer to your question, if you don't plan to add any more cabs, definitely (note correct spelling) swap for the 4-ohm.
Adding another cab will increase the real and percieved volume much more than having a single 4 Ohm cab. The sound will not only be 3+ Db louder with the second cab, but it will sound fuller and spread more. (Remember sound is about moving air. More speakers mean more air gets moved.) The down side is that you have more cab to take to the gig.