Frequency Range - Bookshelf Speakers

my experience with totems and morels is that the less`you rely on the sub the better. sounds fuller to me. however, your electronics effect it alot. the integration question looms as does quality of sub at higher frequecies.

In my experience, the lower your speakers can go, the more flexibility you will have in adjusting the sub's crossover. This can be really important for good integration of your system with the accoustics of your listening room.

This applies to floor standers as well as stand mounted speakers.

I'm not sure too many bookshelf speakers can go down to 30Hz. If they can, and you are just using them for mostly 2-channel stereo music listening, I think it would be better to skip the subwoofer altogether.