Since you seem very concerned with bass, you should stick with the Krell. However, if you really want awesome bass, the 804s are not a very good choice to begin with. I have a pair right now and they can't hold a candle to my 926s in bass performance. You would get a bigger bass improvement by changing speakers than by changing amps IMO. Not to mention it could cost you a lot less money too.
The 402 does have rounded bass which I interpret as a 3D sound rather than 2D slam but everyone sees it a bit differently. From what you've said, I think you will be happier with another Krell.
Arthur
The 402 does have rounded bass which I interpret as a 3D sound rather than 2D slam but everyone sees it a bit differently. From what you've said, I think you will be happier with another Krell.
Arthur