New Stereo on my Felly

i got a new radio for my felli

Pioneer DEH-3000ib

i wanted to run mid range speaker + tweeters of the radio and have a separate woofer, so i got a 80 watts ( 40 amp p.m.o.p. x 2 )amp i wired the amp straigt to the battery + terminal with a 8 gauge wire and grounded it in the chasis close in the trunck, ran a 12 gauge wire to the headunit and for the head unit i used the original wiring except for the ignition i bridget it to the On so the radio turns off when i shut the engine off, ben running with it for a forthnight and no battery drain

the instalation book that came with the stereo did warm me that batery drain may occur if not wired to the ignition so i'm quite glad that i wired the hadunit + amp with no battery drain (couple of post have complaint about drain after fitting stereo, and some blame amp)