Klipsch Heresy IV

Heard the Heresy IV at my local dealer. It was hooked up to a Luxman SQ-N150 a 10wpc tube integrated. Gives you better bass than the III. The speaker is rear ported. This gives you a fuller sound. A nice improvement.

I just got them. Powering them with 8W 300B. Heaven 

I can't quite adjust the fact the Heresy's are no longer seal boxes. While the bass may be more plentiful, is it as tight and does it add boominess to the bass? I wonder if there is any loss to overall quickness and clarity?

Usually porting speakers, no matter what type, gives the illusion of more bass, but it never seems as tight or as "real". If you want the real story do some research on both types of speaker design. I think it was some Stereophile writer, probably Dudley, that wrote a short article about this recently and essentially got everything wrong. So read this article and go the opposite direction and you will be on the right track.  

They redesigned other things with this speaker including the drivers and crossovers, and that interests me...the rear port doesn't interest me so much because I prefer having the sealed box "accurate bass to its limits" with my Heresy IIIs, and easily blend in the REL subs I use...I like the control I get with the subs. I'll listen to the IVs at some time but for now the IIIs are simply great sounding things that were a relative bargain at 1500 bucks new (and they're the "Capitol Records" version which is possibly meaningless but they make them at least "seem" special).