When I connected my HU to the amp, I noticed the HU had two sets of RCAs; Front and SW. I'm assuming SW is subwoofer. I connected the Front RCAs from the HU to the Front RCAs on the amp.

Question 1: Can I connect the SW RCAs to the Rear RCAs on the amp to drive the rear deck speakers?

If not, can/should I drive the rear speakers using the front channels on the amp?

 

A lot of times, 2 preout decks will have a menu option to make the 2nd preout switch from Rear to SW. Id check your manual to see if thats an option first. What kind of deck is it?

 

HU: Pioneer DEH6700
Amp: JBL Power 80.4

 

If you press and hold the function button when the deck is off you can access the function menu that will show you if you can have the rear setting at subwoofer or rear speakers. Just look it up in the manual.