What is the optimal frequency range for a single driver to reproduce?

Posted by akhilesh [ 63.166.222.232 ] on February 04, 2006 at 19:04:24:

1. Tradeoffs:
Multiple drivers leads to a smoother freq response
SIngle driver leads to greater "coherence"

2. What is the spectrum of fundamental frequencies for most instruments and voices? Presumably we want these to come from one driver?

-akhilesh