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Message: <blockquote data-quote="drummer_punk82" data-source="post: 253634" data-attributes="member: 543920">Ok, from what I understand, this is how it works.The preout of a HU is like a preamp to your power amp.  The more volts your HU is sending to your power amp, the more current will flow to your subs which will in turn, make your subs LOUDER.  That's why a 5V HU is a lot better than a 2V HU in terms of the preouts.About your question on why your subs aren't hitting very hard, what is the RMS(continuous) rating of your amplifier and your subs?  How big are the subs and what sort of box do you have?</blockquote>

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