I had Alberts Joondalup do mine. They fitted an amp under the passenger seat and 12" sub in the boot. I think they just wired the sub into the rear speaker cables, but the amp boosts all channels front and rear. I asked them about making it so that I could use the independent sub controls from the head unit, but it must have been too hard for them. Sounds good, so I'm happy

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[CENTER]Car - [FONT=Verdana][COLOR=dimgray][B]MY11 WRX STI Spec R + Recaros [/B]- 284HP|394Nm|Ultrex 3"TBE|PW CAI[/COLOR][/FONT][/CENTER]
[CENTER]Bike - [COLOR=red][FONT=Verdana][B]MY10 Honda CBR1000RR Fireblade [/B]- 171HP|114Nm|Yoshi CF Slipon[/FONT][/COLOR][/CENTER]
[CENTER]My other passion - facebook.com/[FONT=Verdana][COLOR=dimgray][B]JamieWebsterPhotography[/B][/COLOR][/FONT][/CENTER]