Get a load of those feet. Someone slipped a set of solid-brass isolation cones on Pinnacle's AC Sub 100, a working-class $350 subwoofer dressed humbly in black vinyl. So what's with the magic slippers? Another Cinderella story perhaps? Or is it merely a Mr. Blackwell- caliber fashion faux pas, like matching Prada with Wrangler? Well, the AC Sub 100 isn't a thing of beauty, but you can take it to the ball—or put it in your entry-level home theater—without embarrassment. This 13-inch cube can dance a bit. The AC Sub 100 resides at the low end of Pinnacle's subwoofer line, and its feet are hand-me-downs from the company's more-exotic designs. They're standard equipment on, among others, Pinnacle's $1,200 Digital Sub 600. Is there another manufacturer that fits such fancy footwear on its nickel-and-dime subwoofers?