CEDIA 2007

We get a kick out of Paul Barton, so we wandered into PSB's room to see what's new. He was talking to a good-looking man of a certain age (ours, approximately), to whom he introduced us: it was Vance Dickason, the man who wrote the book on designing DIY loudspeakers: The Loudspeaker Design Cookbook.

Joe Harley was striding around the Denver Convention Center. When we shook hands, he glanced around and said, "Let's go somewhere private." We ducked into an empty demo room and he pulled a few records out of his bag. "Nobody else knows about this, I'm giving you the exclusive."

Look at the picture and tell me that those don’t look like speakers! They are, of course, but they are not intended to be driven by audio signals directly. What subwoofer manufacturer Bag End was demonstrating is a small, active bass trap, the E-Trap, and they are driven by the bass frequencies in the room. Each of these small boxes contains a driver, two microphones, and some pretty snazzy electronics that let the driver cancel the energy at the frequency (or two) of your room’s major mode. Sure, acoustic treatment is generally best, but that can get awfully cumbersome below 100Hz. Adjustments allow you to select frequencies between 20Hz and 65Hz and adjust the amplitude and shape of the cancellation. For critical success, you need to experiment with placement (although that is almost always at a room boundary) and, at the moment, have access to some nice FFT software. Bag End's James Wischmeyer promises that, eventually, some simpler setup software will be provided. Mebbe, but I asked to try one ASAP.