Integrated for bi-amping with AtmaSphere MA1s


My speakers (Ascendo ZF3s) have separate terminales for each driver.  I am currently using Atmasphere MA1s for the mids and tweets, and using a Pass X1 and Aleph3 for the woofers.  I'm also using a set of old Entec LF20 subwoofers crossed over with a Behringer Ultracurve pro for the really low frequencies.  I would like to replace the X1 and Aleph3 with a more powerful integrated, and am not sure what to use.  I've been away from this hobby for a number of years, but my first instinct when I think low frequencies is Krell.  The S300i looks intriguing, but I've read that it comes from a dark time in Krell's history, and may not be terribly reliable, and not up to the stnadards of low-frequency reproduction Krell is known for. 
Is this a good choice?  What else should I consider?
honest1
HONEST1rouge all so has pharaoh integrated amp class-d pharaoh on the lows  atmasphere on the highs and has subwoofer out puts to
honest1

The MA1’s OTL’s would be fast, so you need an amp to blend well with that, and yet have strong bass control, and yet with a good lower mid sound. I don’t think the 30w of the Aleph is the way to go.

If you want an integrated that can have speed good bass control and have good lower mids, Yes the Krell S300i would do, also a Gryphon Diablo 120 would be nice, or even a Pass Labs Int-60.

Cheers George
I've never heard an Ascendo loudspeaker, so I'm just speculating based upon what I've read.  Isn't one of their major design goals a coherence of presentation.  Wouldn't all these different amps, crossovers and subwoofers negatively effect the design goal?  Why not just run it with the MA-1, or if you want to max out, multiple sets of MA-1s.
why not use the Atma-shere MA-1 for the whole thing? in my experience the OTL’s do bass very well probably the best I’ve heard from tubes and much clearer then many SS amps out there. you could get another one for synergy if bi-amping is a must. 5ohm load could be an issue if it dips any lower. 

will say will all those tubes and class A amps I bet your room is toasty