Folks, you're missing my point somewhat. A 4x8 rated to handle a kilowatt, powered by an amp that will throw 500w into it at 8 ohms, ought to be rather loud; a "mini 4x10" in essence; thus the title of this thread. I look at the portability issue, since a pair of 4x8's thus rated would get 900w from a GB Shuttle 9.0, come in at under 100 lbs/50 kilos, and be transportable in a regular family sedan. With microamps clearly being the growing wave, it stands to reason that "smaller but loud" cabs are the companion to that. There will always be the need for big cabs, and there will always be those who will want to power them with big amps too, but for those of us who gig frequently and want to minimize the schlep factor, I believe that my original post of this thread is a "heads up" to manufacturers (specifically GB) about a market niche.
I addressed this topic with Jeff Genzler himself in November, when I bought a Shuttle 3.0 (1x10) combo at a GB event, and a few weeks later, I got an Ampeg VR2 (2x10) cab to put underneath it for 300w and a small stage footprint. I love the simplicity of this setup, and it is plenty loud for a typical bar gig with my band. I still have a GBE400 atop a pair of LS112T's for larger gigs, and could combine both rigs if I really needed to bring thunder. Usually the pair of 12's is enough for larger rooms, and outdoor shows, which typically have PA support.
Back to the conversation with Jeff Genzler: When asked what surprises we might see at Winter NAMM, he replied that there would not be any new rollouts, but that Summer NAMM would see a few. Thus, my first post in this thread was a hopeful expression of what I'd like to see, especially in the wake of what MarkBass rolled out at Winter NAMM. It's no secret that, right now anyway, GB and MB are the clear front-runners in microamps and small rigs, with SWR now ready to join the race in earnest with their headlight and amplight offerings and golight cabs. The SWR "mini 4x10" rig that I would possibly look at would be a headplight atop a pair of golight 2x10's, for 400w, and family sedan portability and around 100lbs/50 kilos in total weight. Prior to my 1999 switch to GB, I played SWR gear, including Henry the 8x8. I was very skeptical about 8" drivers back then, but that cab changed the outlook, and now, with advancements in technology, we might be ready to see the 8" driver gaining even more utility and popularity.
Hopefully, this second post will aid in steering the discussion a bit more precisely.
Ampeg also made a 4x8 and don't forget the SWR 8X8 . Some of those GB single cabs should do it for you as well 
Here's my "mini" rig I can break it down to a single 10 at 4 ohms pushing 350 watts and these little Schroeder cabs really hold it together , or 2x10 Bagends at 4ohm or all 3 at 2ohms at 500 watts 
