Gazmo: I´m the one that posted this RTA, and I really have to make it clear, this is an AutoTuba with another driver than what it was designed for.I used a high q and fs driver (ApexJr Super8), while the horn is designed with a low q and fs driver (MCM 55-2421) in mind.
So please don´t use this as an example of how the AutoTuba response is.
Kim