Krell, when used in the bass region only is hard to beat.
Since it's only Achilles Heel, IMHO is the mid/upper mid hashiness that I've described ad nauseum on these pages, it seems like a perfect choice.
It's deep, powerful and controls very well, all attributes that the Snells can use.
A used 200wpc Krell would be my first choice, and they're probably readily available.
Good luck,
Larry