Shouldn't it be crisper/cleaner/more vibrant?

Yes, what did you do to correct the problem!!!

@willywonka  wrote ". . .Klipsch have never been known for having deep bass. They may have lots of bass but not really deep."

RESPONSE:  Hmmmm, not sure that "lots of bass but not really deep" makes sense. . . .Speakers don't have bass, recordings do.  Speakers, of course, have some capability to reproduce it.   

Regardless, I'm speaking from my frame of reference.  That is, relative to my full-range electrostats which have a steep roll-off below 50 Hz.  The Cornwall extends significantly lower as it can reach down to 34 Hz.  I call that deep.  

Klipsch Cornwall's sacrifice low frequency bandwidth for high sensitivity, see here!

Mike

In my system I have the Klipsch La Scala (AK5) for the past 6 years. I did not feel like I needed more bass or extension on the lower end. As the final part of my audio room, a few months ago, added a pair of REL S 212s. I did this not for the speakers, but for the room itself.  Wow, really transformed my audio room and listening experience. The room has more depth, wider, deeper, & bigger sound stage on all tracts and whichever source was played. Even tracts with very little low end (female voices, piano, acoustic guitar) there is so much more nuance. Felt more like a live performance & I was seating in the sweet spot of the amphitheater... the whole room was transformed. To note – I did have a chance to listen to the newer AK6 version recently…I prefer mine, the AK5s…sometimes newer is not better.

I know no one ever wants to talk cables…. But just putting my 2 cents out there. If you’re interested in investing in new speaker cables. Two of my friends have been very happy with Audio Envy’s speaker cables. Been a while since I’ve changed mine out but I’m actually considering it after listening to both of their systems.