The guy who claims to have designed the system and licensed the design to Fishman originally created two versions, one with a sub and another without:
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From what I've found, the guy has a history of outlandish claims and a lot of people think he's full of it, but here's the story on the SoloAmp:
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Some info about the guy who claims to have designed it and licensed it to Fishman:
http://www.talkbass.com/forum/showthread.php?t=465924
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I don't have an opinion about the guy either way; this is just what I've found online.
By the way, Phil Jones also made a prototype version of a portable line array, complete with 3 woofers for low-end. Here's a photo:
AADsound.com is another Phil Jones company.
Apparently, they decided not to go ahead with production on these. I heard that this is because Bose aggressively protects their patents and there was talk of a lawsuit which prevented this from happening, but I don't know if that's true, and this would conflict with the fact that Fishman now has one. Frankly, I'm more interested in the Fishman or even the Bose because I imagine the PJB version would be prohibitively expensive for me, although I bet it would sound fantastic
Here's another TB thread about the Fishman unit, from the double-bass side...
http://www.talkbass.com/forum/showthread.php?t=465924
I really want to try one of these. I have heard that they are more designed for solo coffee-house type gigs, along the lines of a two-channel acoustic guitar amp (vocal mic + guitar), as they have no subs, and aren't as high wattage & don't have as much speaker surface area as the Bose systems. The Fishmans, although much more attractively priced, will probably work just fine for coffeehouses, but I doubt they would work for running drums or bass at real club levels.
The guy who claims to have licensed the designs to Fishman said on his website that he plans to release his own versions at about a $500 price point, with better sound quality, smaller size, and more power, than the Fishman versions. He said they would be out this fall and that he would have full specs and photos on September 1st, but obviously his website is out of date on this, as the info is lacking. Fishman started shipping the SoloAmps on Sept 18th, although they introduced them at the summer NAMM show. The inventor claims that the designs are now over two years old.
If anybody has more info, I'd love to hear it!