What's Next

ricred - I understand; I realize I mentioned the HD90 but maybe the HD60 would be worth considering. Joe Abrams has a pair listed here at about $2800. Also watch ebay.  I was more mentioning a relatively lower cost cable change as an alternative to changing out your speakers (if you generally like the PL500s). Demos of cables are easier than in-home demo of speakers. I’m sure the Clarus are very good in their own right, but I think the ’detail’ of the MITs is their selling point (and what it sounds like you’re looking for more of from your PL500s). 

The speaker cables really do need to be changed. Clarus cables are okay at best.

We are evaluating some new cable companies so we can see.

For a quick kick replace whatever power cable you have going into your power conditioner with an Isotek Syncro, amazing power cord.

Also which power cords are you using?

Dave and Troy
Audio Doctor NJ

I recently had a home audition of Shunyata Sigma, Audience A24 SX, Clarus Crimson, and my Wireworld Silver Eclipse 7. I preferred the Clarus, followed very closely by Audience. In my system the Clarus provides the best detail without being forward, presents a wide and deep soundstage, and great front to back placement.  
My interconnect cables are Audioquest Fire XLR and my power cords are Wireworld Silver Eclipse 7 with Platinum plugs. I recently compared Shunyata Sigma power cords to the Wireworld and decided to keep the Wireworld.
Cables are really a crapshoot and the only way to know what's best is to evaluate them in your own system. The problem is there are endless combinations and it's impossible to evaluate everything. 
 

Are there any Clarus Crimson speaker owners on Audiogon? If so, what  other cables have you compared them too?

Here is the problem the AQ Fires we did a direct test vs the Wireworld and the Wireworlds Platinums were way better. Also the Wireworld Silver Eclipse power cords are okay at best good for the money but a reference grade system such as yours needs better cables.