Large Onken for Tru-Sonic

[jlsem]

I would like to build an Onken enclosure for my Tru-Sonic 206 AXA drivers. The problem is the only parameter I have for them is a free-air resonance of 35Hz. I have downloaded the Onken calculator but have no idea how to make it work. At some point in the future I would like to use the enclosure for a Supravox 400-2000 which has an Fs of 23Hz. Can someone please help?


TIA,
John

[GM]

As a general rule, a cab designed for a 23 Hz Fs driver won't work well with a one designed for a 35 Hz Fs driver and vice versa unless their Vas, Qts T/S specs are considerably different.

Regardless, with no specs, the best I can recommend for the Stephens is to use one of the Jensen Ultraflex designs the Onken calculator is derived from and tweak the tuning to suit using either a tube amp with variable DF bass control or dial it in with a cheap pot, then measure its resistance and replace it with a non-inductive power resistor grid and have plenty of power on tap to compensate for system's reduced efficiency.

The Supravox's specs if ~accurate look like they can be used in the Jensen cabs with the same tuning caveats, though plugging them into the calculator would in theory be a better match.

GM