Ivan - for what speakers? Aida's? Futuras? Something else you're hiding in your storage closet?
Desmond Harrington (former Lead Engineer for Krell) designed the X1000.5. I will PM you his email in case you are interested in hearing from the horses mouth!
Depending on what speakers, don't pass up (no pun intended) the XA200.5's.
The top dog Pass amp is the xs300 -->
The Pass Labs Xs 300 delivers 2kW "all day long" | Stereophile.com
https://passlabs.com/products/amplifiers/xs/xs-300
NOTE: Joe, do not click on any of the above links. Your head might explode. Mine just did.
Mike