David: A question - resonant areas of what? In the case of the B-One, there is no resonant chamber, there is no box.

Michael: In the frequency range of "sub", meaning 0 to 80 or 100 hertz, typically a fold horn design sub is not a device that will read anywhere near "flat" with test instrumentation. Are there particular areas in the Bassmaxx that shine, and do some frequency areas have to be "toned down" so that the 0-80hz region is even in output?

David: The B-One is not a typical folded horn by any means. As far as I know, most of the users simply set the crossover at 90 Hz and leave the EQ flat. With frequencies that low, most of the peaks are going to be room modes. Typical folded horns usually lose output progressively from 300Hz down. By the time you get to 80 Hz, you have to start adding LF with the EQ. The B-One is a different animal. It's designed to produce the low bass without the help of EQ or processing.

Michael: That is quite a fascinating assertion. I am not a test engineer in the formal sense. I think one method of testing subs for frequency output is outdoors perhaps on a concrete landing strip. Have you done formal testing of the Bassmaxx? Generally any sub will have at least some peaks or dips - this is fairly standard.

David: There are some minor dips and peaks within the operating range, but when you listen you don't hear them. They remain consistent and don't grow with higher input levels, either. They are not your typical "ring modes". The frequency response plot looks much the same at 137db as it does at 110dB.

Michael: At this time you apparently have one or two long-travel drivers to apply to your box. Are there any other driver choices under development?

David: We have ideas for improved drivers, but they are a little ways off, at the moment. We didn't develop the drivers, but we have specified certain modifications to the Seismic drivers for use in our cabinets. We are always looking for ways to improve the performance of every link in the chain.

Paul Bell: I'd like to know about the 13-foot horn. OK, the cabinet is 4-ft by 4-ft. How do you come up with 13 feet?

David: Actually, it’s 4-ft + 4-ft + 4-ft, + 1.5-ft. The cabinet has two folds and two bends. It is a complicated construction. One of the areas in which Mr. van Zyl excels in folding horns.

HarryB: At John and Teri Hogan's place, you all played with some of your boxes with the MTH on top and it was crossed over at 160Hz. However, I notice your web site calls for 90Hz. Any comment?

David: We crossed the B-Ones at 90Hz. We didn't need a lot of top end to produce a rich, full sound. We never drove the MTH's very hard at all.

Tom Danley: If you could wave your hand over a perfect driver, what things would you want to be different than available components?

David: I'd like to be able to run unlimited power into them! ;-)