What GeorgeO said.....I myself prefer that extra thump with my Wharfedale 9.1s,but the 9.1s are not that much bassy either.I had tried 9.2 and 10.1 for short stints of time, and still would get a sub to go with them anyday,eyes closed.I don't have a very musical sub, but it definitely gets the work done and i can say immediately if it ain't turned ON even when hearing normal 2 channel flacs.Having a sub is a must IMHO if u are into those DTS Cds/wavs like me.
The main problem in this subwoofer YES-NO query is that it is highly subjective.Some people cannot live with the overpowering lows that subs produce, others cannot live without it.A properly tuned sub can do wonders for music in my opinion.
Plz do urself a favor and get an extended audition for atleast 3-4 hours with sub connected, and then, try auditioning the same songs with it unplugged.See if the extra thump adds flavor or spoils it for u.Then only decide, don't throw 15k+ on a sub for music unless u have auditioned,i again repeat : THIS IS A VERY SUBJECTIVE MATTER.
Happy auditioning.