When I get my SB112, I will post photos with my impressions.
Hmm... This thread is looking pretty dead.

But I said I would follow up, so here it is. Maybe my first impressions will be useful to someone.
Today my Avatar SB112 with 500 watt Eminence Delta LF 12 ceramic speaker arrived, on time and very well packed. The carton was solid. The inner packing had a cottage industry feel to it, which I like. It was a refreshing reminder that quality goods and services don't have to be 'corporate slick' to be functional and done well.
Configured as it was for me, the SB112 looks great, both up close and at a distance. To my taste, the faux vintage styling of the grille makes up for other, more modern trappings. And it's just darn handsome!
Very close inspection revealed a few minor flaws in fit and finish (slight misalignment of hardware, mostly), but nothing worrying.
First I drove the SB112 with a Nordy vJ4 (Big Singles and 2-band Nordstrand preamp) played through a Tech 21 VT Bass into an Acoustic Image Focus 1 Series III amp. Then I switched to a 1969 Fender Precision Bass played through the same amp, then through a 1973 Fender Vibro Champ.
With the SB112, the Vibro Champ was... well, it was a real champ.

Probably useful for recording and certainly for practicing, this setup missed the point of of the vintage amp package: the sound of the driven speaker interpreting the tube amp.
In contrast, the VT Bass and AI amp were the real deal with the SB112. Though I didn't play very loud, I was at the practical limit of volume for my music room at home. It was my "bedroom sound" for sure, but it was instructive.
My key observations about the Avatar SB112 sound:
1.
Bass distortion. Using the amp's low cut filter to cut from 30 hz down made a dramatic difference. The cabinet still produced thick low midrange and bass, but bass distortion was greatly reduced, letting most of the spectrum relax and come into focus. I highly recommend this tweak for the SB112 if you have a filter (high pass, low cut, etc.) and probably with many full range bass cabinets.
2. UPDATE: I take back this point.
Please see my revised observation in this later post. [DEL]
A midrange peak. With or without the low cut filter, there was a resonant peak whenever I played C# on the fourth fret of the A string, or equivalent positions. Octaves and tenths of that note exhibited some of the peak, too. Switching the amp's filter from cut (> -18 dB) to notch (-12 dB/octave), I was able to tune out the offending peak.
The amp doesn't have precise markings throughout the range of its filter's frequency adjustment; but if the sweep is linear, the setting I chose obviously is not at 69.3 hz (the fundamental of C#, 4th fret, A string), and is about twice that. Maybe it is a prominent harmonic and not the fundamental.
I changed the acoustical space by opening all doors (they were closed at first) and playing again, but the peak and its reduction were reproducible. Likewise when I switched basses. So I believe the SB112 has this undesirable midrange peak.
This cabinet is not a one-note wonder, not by far; but I believe that its usefulness is so improved by correction of the peak, that with the SB112 I will use the AI's filter for notch instead of cut. If someday I can add a Thumpinator or similar to this rig, I may try it, to have both the notch and cut improvements.[/DEL]
3.
The adjustable tweeter. First I played with the tweeter completely off. The sound was good, and articulation was useful and sweet, if not with very high frequencies, as expected. Then I added some tweeter and found the setting that sounded most natural to me. (I'm not a tweeter in bass amps kind of guy, though I owned and loved the first SWR Redhead back when.) Perceptually, there is a gap between the highs of the 12" speaker and the tweeter's range. I think that if you crank the tweeter, the gap will be quite evident. But used just a bit, the tweeter lends a very believable "tasty" articulation to the 12". I like it!
4.
The thickness. This cabinet's got back. Haha! People, it's not about bass in your trunk, but about the fat, sweet, enveloping, caressing thickness: the nuanced low midrange that opens with ease into the lowest fundamentals the bass guitar is producing. Sonically, here is the secret area between body punches and sex on the beach. The SB112 goes there and likes it. At least with a 4-string bass guitar it does. I no longer have any low B basses. But I would guess that the SB112 does a fine job down to low B (albeit maybe with a bit less authority.)
In conclusion, I think the SB112 is a very good-sounding and useful full range bass guitar cabinet. It gives excellent value for money, with a level of performance that will please most working musicians and enthusiasts alike. Yet it will not leave them wishing they could have spent several hundred dollars more on a boutique cabinet. And that is the sweet spot. If you need head-crushing, mercilessly accurate hi-fi in a bass cabinet, look elsewhere. But if you want a sweet, strong bass guitar cabinet with traditional leanings (with the ceramic Delta driver, at least) that you can live with every day, the SB112 is a good bet.
Best,
Snaxster