I have currently installed the alpine ida x100 deck. the amp control wire (blue) runs to a 4-way amp which powers my type-r speakers (x4).

I'm looking at getting a subwoofer powered by a 1-way amp. I can't remember offhand how I could do this without looking at the harness. Are there 2 amp-control wires? Are they both labeled?

Sorry if this is a stupid question!

 

on the back of the radio there should be some rca cables hanging off the back

they should be labeled "front rear sub"

find the sub out and run some rcas

 

thier is only one amp turn on lead (blue with white stripe) that wire can be used to turn on two amp but dont wire anything else or more on it or you can burn out the amp turn on lead. be carefull the amp turn on leads on the alpines SUCK! they always burn out for some reason the red wire (acc) on the deck side is the same thing basicly you might want to go to that...

 

It's best to use a relay for your amp turn-on lead, that way you can switch on a bunch of equipment without having a big draw on the headunit.