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
rouge audio cronus magnum has preamp outputs for biamping and 2 outputs for subwoofers it is tubes 
I like a few different ones, depends on the duty. For bottom to top, Hypex modules, work real well. Mine are from Nord, in the UK, and got wonderful service. There is an option for volume control, rack mount, buffer board, opAmp options. There is a company called VTV on eBay, they have Hypex modules also, state side.

Your running a 2496, Behringer? That will give you 6 lines out with any signal you want for subs or otherwise.
I use them for all my, bass management including servo bass, MB / Bass columns, and standard low rider bass bins (under 36" tall). I use Behringer 12Ks for all my bass work. 450-550 for 4.5K per channel, and bullet proof. They are good to 2 ohm or less.  I think I paid 1400.00 for 3 new amps wit h3 year warr.
Full DSP, on the fly correction, for 6 channels.  2496/12k x 3. I’m a Mac guy so I have tone control to boot.

I mod them and disconnect 2 of the three fans, and put one on a toggle switch. They work perfect and have volume control, LP/HP filter, mono/stereo output. Did I mention 4.5K at 2 ohms and 3K plus at 4 ohms. LOL NO NOISE! Dead quiet, on the floor noise.

Second, my little toggle switch addition, makes for late night, low volume listening, with a flip of a switch, no fan noise, I’ve seldom gotten them warm without the fan, much less with, and with THREE, you’d be DEAF, if they ever got warm, they can really pump it out...VERY low distortion.

Regards
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