imo, its ok to have no subs but its hard to complete the sound setup kung wala sub. my suggestion, get those slim type subs that would fit under the front seats.

maririnig mo difference kung meron at wala, parang makalansing talaga yung sound. pwede rin 3 way seps but nothing can replace the boom sound of a sub. kasi for me, its hard to attain SQ kung walang subs to support the beat (rap/hiphop) or bass guitar and drums (band/acoustic).

my 2 cents