Wtf? Need Help!

[Shooky22 10+ year member]

ok, i had a 2 channel crossfire 140watt amp hooked up(bridged) to 1 rockford fosgate 8" sub. It had some pretty good bass. i bought a RF 1500wt 501x 4ch amp.

i hooked it up in 1 channel to my sub, and it sounds like shit.

well, actually it sounds nice but it is WWAAYY quieter than the other amp.

i tried bridging it to 2 channel but it was no better.

my cd player has a sub control and it is all the way up and even with the gain on the amp the sub is still not near as loud as before.

the amp has 3 diff. rca jacks 2 for the front 2 for the rear and 2 that say pass thru--does it have anything to do with them?????????

P.S- (this is in a single cab truck, with 2 door speakers-thats it) i installed 2 tweeters above the seat in the rear and hooked them to the cd player then put in the new amp(i did not hook them up to the amp tho)--- does this have anything to do with it???

PLEASE I NEED HELP!

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[Shooky22 10+ year member]

oh yeah, and another question--

how do i get 4 rca cables from the back of my cd player to the amp?????

so that i can hook em up in the front and rear spots on the amp?

thx

-Shooky22 //content.invisioncic.com/y282845/emoticons/crazy.gif.c13912c32de98515d3142759a824dae7.gif