I am in the very privileged position of working in an FE college which has just provided us with a new studio. It is lush, but that is beside the point. Yesterday we were testing various signal paths out and we plugged a passive Sandberg P into a Neve 1073 500 series, a Cranborne Camden 500 series and a Warm Audio WM12. Obv they were all different flavours of nice. But what confused me somewhat was that the passive tone control on the Sandberg had virtually no effect into the 1073, but did exactly what I expected it to into the Camden and the WM12. I suspect this has something to do with this impedance load being presented to the bass by the preamp input, but I could well be wrong. Can anyone throw any light on it?
Sadly, my fave was the 1073. My tastes are simple but expensive.