I thought I read that the Demeter uses a Hypex module (?), not ICE. Someone with more knowledge will correct me if I am wrong.
Pretty sure it's an ICE 250ASX2, a la the GK MB800, TH500, and Puma 900. That's not to say that the manner of implementing the module into their respective designs wouldn't differ.
Wondering how this Minnie 800D handles the "bottom" at volume. Thinking about using as a slave for a second cabinet. While I love many things about my Tone Hammer 500, the low end gets flabby at higher volumes. Since it sounds like this uses the same ICE power section, does it do better than the TH500 at getting tight bottoms?
Same as the OP, would use the send from TH500 to a power amp.
I had a Demeter HBP-1 800D, which, I believe, uses the same 250 ASX2 as the Minnie. I would expect the performance to be similar, but I could be wrong. I used that amp as a standalone, as a sometimes-power-amp (via the effects return) for Monique, and as a preamp in front of a Crest Pro Lite 2.0. It had more kick and held together significantly better at high volume into an 8 Ohm load than my Markbass F500 did -- cruised where the F500 started to compress, but that amp doesn't use an ICE module. (The Demmie also tested well, if I recall correctly, when Bass Gear magazine put it on the bench. Maybe @tombowlus can offer some insight?) I did briefly own a Tone Hammer 500 and got the impression that the Demmie had more on tap than the TH did (definitely had a tighter low-end response), but, while I played it out a few times, I never pushed the Tone Hammer that hard, so I can't say for sure how they'd compare at their limits. A lot of the difference I perceived would, I imagine, have to do with the amps' different front ends.
I briefly tried the HBP through the 1000 ASP based amp that JGR built that Mike Arnopol's got -- that was awhile back; didn't play it on a gig or anything, but cranked it pretty loud outside. Felt like the low-end clarity and articulation were better -- and the sound smoother overall -- through that amp than through the Demmie's internal power, but I'd still put the Demmie a notch or two up from your typical "500 Watt" micro in that regard.
Sorry I can't offer a more direct comparison.