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<blockquote data-quote="jmcinvale" data-source="post: 7241728" data-attributes="member: 608668">I currently have two 12&quot; kicker CVR dual 4 ohm subs in two 1 cu ft sealed boxes powered by one of those JL subwoofer amps and they sound much better than they did running on a Rockford Fosgate P500-2 amp. I think one reason is because the amp tracks the speaker actual impedance and adjusts its power supply voltage to provide the optimal power output for the speaker impedance. I also have a JL 300/4 amp moded internally to be a 2 channel amp. Guy at work traded me those two amps for my two Rockford Fosgate amps (P400-4 &amp;amp; P500-1) and $175.00 because he wanted a different sound.I only use the crossovers on the subwoofer amp and have them both set to 100 Hz with the subwoofer set to 24 db/octave and the preamp out to 12 db/octave as the system sounds best that way.Another good thing is I already have a 150 amp circuit breaker near the battery for my current system and I will not have to upgrade the breaker as the total amps drawn by the three amps will be 140 amps. When I need to replace my battery I will use an Optima yellow top if it will fit my vehicle.</blockquote>

[QUOTE="jmcinvale, post: 7241728, member: 608668"] I currently have two 12" kicker CVR dual 4 ohm subs in two 1 cu ft sealed boxes powered by one of those JL subwoofer amps and they sound much better than they did running on a Rockford Fosgate P500-2 amp. I think one reason is because the amp tracks the speaker actual impedance and adjusts its power supply voltage to provide the optimal power output for the speaker impedance. I also have a JL 300/4 amp moded internally to be a 2 channel amp. Guy at work traded me those two amps for my two Rockford Fosgate amps (P400-4 & P500-1) and $175.00 because he wanted a different sound. I only use the crossovers on the subwoofer amp and have them both set to 100 Hz with the subwoofer set to 24 db/octave and the preamp out to 12 db/octave as the system sounds best that way. Another good thing is I already have a 150 amp circuit breaker near the battery for my current system and I will not have to upgrade the breaker as the total amps drawn by the three amps will be 140 amps. When I need to replace my battery I will use an Optima yellow top if it will fit my vehicle. [/QUOTE]

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