well you realy only what . doubled your power ?? i have no idea what the ratings are on those amps/ i assuem the one is 700 rms and the other 1000??

even assumeing you doubled your power you will have a hard time hearing much a difference cause at most your looking at 3 db's

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Alpine 9805
Kicker S10L5 (2004) in ported box
Power Acoustik LT980/2 500 rms @ 4 ohms mono
Power Acoustik LT720/4 70 rms @ 4 ohms x 4
JBL 5 1/4" components