i'm unsure what most would consider a "quality" sub, but yes...adding a sub will help your bottom end if you're running short. am currently running a velodyne but have experience with boston acoustic and polk subs. in every instance, the sub improved the overall sound to my ears. i remember adding a no-name $59 sub to my sisters crap stereo 10-15 years ago. it was no where near as crappy afterwards.
a quality sub would obviously be best but a decent one will also help...when compared to none at all. if your mains don't reach low enough or are short on hit/slam, adding a sub is a good way to go imo.
a quality sub would obviously be best but a decent one will also help...when compared to none at all. if your mains don't reach low enough or are short on hit/slam, adding a sub is a good way to go imo.