Zenaissance, obviously you like the HCA2 on your Ascents...have you compared it to other amps in your system?
I'm currently biamping a pair of ML Odysseys with the HCA2 on the woofers and a Pass X150.5 on the panels. I've been toying with the idea of getting a single larger amp to simplify the system a bit, but I don't want to lose out on sound quality, and it might be hard to find something that sounds as good as the HCA2/Pass combo within budget.
