no doubt
you can buy high quality 12's that bump harder then 18's
usualy it's best to do your audio system like i have it in a couple cars of mine:
1 200 watt amp for front speakers
1 500 watt amp ifor back speakers
then you do depending on how much bass your subs and bump
2 1000 watt amps, or 800's for the subs alone
this way your speakers / subs never cut out when you have the music loud
always custom done built into the trunks, air tight...mp3 deck all the way with 25 disc changer
