I was gonna wait until I played it at rehearsal but rehearsal got cancelled at the last minute, so I thought I'd post these initial impressions.
Caveat: I'm a part-time bass player with way less knowledge than most of you folks. Take what I say with as much salt as required.
Executive Summary: I dig this amp a lot.
I set the ThunderFunk to flat and hooked it up to the one remaining bass cab I own - a Genz 112T.
Now, for comparison sake, my old amp was a Nemsis 2-10 200 watt combo that I also used to drive this cab with. IMHO, the Nemesis is perhaps the wimpiest 200 watt bass amp I've ever played. I don't miss it a bit.
The ThunderFunk was noticably more articulate. Wow, I finally have a low E I can use. I set the gain all the way up and still wasn't clipping with my passive Barts unless I slapped. It sounds good but I wonder if a tad more gain on the input might be in order. I guess I'll never know.
I set the master to about 1/3. It really drove the cab much better than the Nemesis did. It just felt like it was all right there. The Genz cab is pretty in your face though. I wish it had a tweeter adjustment (I may relegate this Benz cab to the woodshed. The overly-agressive tweeter is starting to annoy me). I ended up dialing back the Treble more than I wanted to. It felt like I was muzzling the amp a bit. Still, it didn't sound bad by any stretch of the imagination.
I tried engaging the Comp/Limiter and really liked it. Way better than the outboard dbx 163 I've used on occasion. Still plenty articulate on the low notes. No sucking or pumping whatsoever.
I moved the Enhance around a bit and settled in around the 3:00 position, which rounded out the tone some. Nice. Dialed up a bit more bass. Nicer still. I'm pretty floored with how good this amp and a 1-12 2-way cab sound.
I did play with the parametric mids a bit but set them back flat pretty quickly. I need to get this amp to rehearsal before I start fine tuning the mids. My band's current instrumenation is guitar, sax, bass and drums so there's a lot of room in the lower mids. The guitarist especially wants a more aggressive bass presence than the last guy so that he can lay back more when comping. I'm still groping around for a tone that will fill up just the right amount of space but not walk all over the other guys. I'm pretty sure this head can get me there.
Hmmm.... now I need a cab or two.