Im due an ice upgrade. now ive read the ice FAQ and it will be some coaxials up front but im wondering is it better to disconnect the rear speakers and run an active sub(infinity/vibe etc) in the boot. will the bass be strong enough from two fronts and one sub OR do I can I replace all 4 speakers and still run a sub in the boot? Running decat HKS and love clean crisp tunes but dont want too much hassle? whats the easiset way to cracking bass!