pioneer sub installation. help!

[jonbanff]

need some help. have bought a Pioneer active sub on ebay. came with no instructions and trying to fit it myself and getting nowhere fast. there are 3 main wires coming from the sub unit: a yellow, a black and a blue. trying to work out which wire goes where onto the back of the stereo unit. the black wire is the earth i think, yellow power (onto the battery) but trying to work out which wire to connect the blue wire to. anyone got any ideas? i think it is the remote turn on wire i need to connect to. cheers,
JON