A customer contacted us and wanted an SPLx type Custom curve device included with his shipment, so we dropped everything and tailored the curve to the "V1" position on an RCA 77DX. (of course!)
Anyway you can see the relative, (Not NORMALIZED) bass curves of a Studio Vocalist in stock form (green) and a custom Studio Vocalist (SPLx) (red). I emphasize that this is raw data, not normalized, obtained in direct A-B (two side by side mics looking at the same source) mode.
I will get back to the acoustic tube next week as everything is ready, but it will have to wait.
AES Paris starts tomorrow....stop in and see our mics.