I figure you guys would appreciate something like this. I've had these photos for a few weeks already and I'm just now getting around to putting these up.
I got these photos on the local RT in Sacramento. From memory, the guy has around six or seven of these ranging from a large tube that you can stand on to a box smaller than the one featured in the photograph. This particular box sports a full compliment of speakers (including tweeters in the handle), rechargeable batteries good for between one to six hours depending on volume and external speaker taps. He seemed to be a light rail regular so other local Sac people might spot him.
Sorry for the quality of the photos, all I had was my cell with me.