sealed 3-ways

>Brian what is your budget? if you can afford go for the bigger ATC speakers, they work basically as closed box speakers, the openings do not act as your typical bass reflex, they are only there to take some pressure off the woofers.
i got SCM35s and am very pleased with them, great value, solid engineering and performance. one thing - you would need a good strong amp for them.

thanx for all the responses! a dedicated midrange unit is of primary import. sealed box prefered for integ. purposes w/sub. plus i feel the physics of sealed is appealing!

Not sure the comparison between TL, sealed and aperiodic is correct. 

One big advantage of a sealed enclosure is that the woofer is controlled at all bass frequencies. With a ported box this is not the case below box tuning. Also room gain can work v well with sealed designs, givibg a more natural bass response.