i was wondering what kind of speakers are the factory ones, the midrange or midbass speakers sound like subs to me, i don't ever remember my boston acoustic pro 6.5 mids having this much bass in my old car... the factory mids in the 2004 g35 coupe sounds pretty good in terms of bass, you can actually feel it... can someone tell me something that i don't know about... im pretty sure my factory bose system doesnt have a sub, since i have the non premium package... cause i plan on replacing my factory with my boston acoustics next weekend and need to know if the mids will give me the same if not better bass response than the factory mids... weird...