As you know, I've built a clone of your autotuba. You may not know that I've also built a system with a Brahma ten. I would argue that the two systems are *completely* different. They are almost "apples and oranges".

My autotuba clone has such a low level of distortion, you can hear the pitch of every bass note. It may well be the most revealing sub I've ever heard, and I've heard A LOT. It is also very inexpensive, and VERY LARGE. Three and a half cubic feet is huge by car audio standards.

The Brahma 10 I built is much more expensive, but it's also an order of magnitude smaller. They sound completely different; the Brahma 10 sounds more like a "traditional" car audio sub.

John