I actually have Rich170's old Pioneer headunit in my Focus and it does sound very good, i have a 4 way 580W Pioneer amp in the boot bridged to a pair of Vibe speakers in a stealth shelf and JBL's in the front doors. I disconnected the standard rear speakers. Sound quality is very good but in the past i used to have Subs in the boot and since experiencing these nothing comes close to providing that crisp base line. Im currently looking at putting a single sub back in the boot, and ditching the Vibe speakers.