Great points!! I won't go past 12's because I want the tighter response from drums, etc... I just like them better than 10's. I had 4 8's once and that was actually very good. For just vibrating, get 15's but you will waste the whole trunk doing that with the box. And it wil be muddled bass and in a few years you will be semi deaf. I use good amps, speakers and head units, then spend a lot time to tune the system. I get the best of both worlds, good sound at low and high volume. I personally am not into bassing the cars around me. Nor do I like it when it is done to me.
