This looks really promising.
http://www.tech21nyc.com/products/power…eucedeluxe.html
I used to own a Tech 21 Power Engine when I first got my Kemper. It was a great speaker, but definitely coloured the tone.
If this new one is better, I think it will be quite good!
And guess what, you can use it for bass too!
Still YMMV, caveat emptor, etc. Let's see some reviews when it's out.