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Originally Posted by Lessy  impedence = total resistance in an ac circuit
that means, vol of box, vol of port, tuning freq, freq played, bpressure, temperature and the car all create some form of resistance
this is why us spl guys tune all of the above |
^^^^ exactly what he said.
sub's rated impedence is only one variable out of many which influence how a sub behaves, how much power it will get, how loud it will play and what the actual resistance will be.
BUT, if you want a simple answer to your original question,
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So the question remains... What makes a speaker louder?
More current? or more voltage?
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the answer is - more of both.
realistically tho, the 15amp scenario would probably sound cleaner.
Linear Mode
