My preference is for a standard 3 way. I use a cross at 165 and 2500 with electronic 24 db/octave L-R.

If you want to see the system go to here: http://pub48.bravenet.com/photocenter/album.php?usernum=4095425731&album=48032

Others tend to prefer systems with ribbon or planar tweeters and larger woofers, that cross at 1600, and use a subwoofer for the bass, crossed at 60-80hz.

Could you be more specific in your question?

Marlboro