R1Style

iTrader: (20)

Ok... my deck has two pre outs on the back of it.
One is for Front Speakers and the other is for the Rear Speakers.

I trying to hook up my sub and amp but when I run the RCA cables through the Rear Speaker pre-outs... I get no sound. Same thing when I run it through the Front Speaker pre-outs. I called a guy at Future shop (Mobile install) and he said it should work running them through the Rear Speaker pre-outs but I'm still having no luck. Can anyone help me out?

I just bought this amp used... could it be the amp? Is there any way to test it?

Thanks in advance

ZSKCivic01

Thats weird, my alpine unit has 3 pre-outs, front, rear, and sub. Are you sure there is no pre-out for a sub? Usually the rear out is just for regular speakers that go in your rear deck.

R1Style

iTrader: (20)

Yeah I'm pretty sure. I have a JVC deck and not an alpine deck. It's the KD-SX780 and apparently only the KD-SX980 has the sub pre-outs.

AzNmiKex215

iTrader: (2)

maybe there is an option in one of the headunits menu to turn on "sub output" or rear output etc

custom2k1

It sounds like the amp to me but there is any easy way to test it. Make sure everything at the amp is getting power (B+, remote) and make sure the ground is good, also make sure the subs are hooked to the amp. When the amp is on, unplug the rca wires from behind the deck and touch the ends between your fingers. Make sure you are touching both the center post and outer conducter. If the amp is working properly you should get a light thump from the subs everytime you touch the end.

I know this method is my no means high tech, but its a very simple method to use when testing an amp.

LudlamTheory

to test it plug a walkman or something into the amp to see if you get output

R1Style

iTrader: (20)

Dude you fu*king rock... I'm gonna go try it now... thanks for the tip!!