I am right now!
Above the 4425, electronic filter (computer, within foobar) with an additional 37uF protection cap (Solen 75+75, waiting for cc)
LP @800Hz, 24bd/oct
HP @800Hz, 12bd/oct (should be 24db/oct acoustic with horn rolloff), with a reversed phase
I can say much about the sound yet, as there is no compensation (The eq in foobar are not up to the task, so I prefer to let them run untouched for now), but the potential is clearly there! The 4425 sound lifeless in comparison.
With these 2435 you cleaned/refilled/aquaplassed and these H9800 wood clones I know I am on the right track.
Many thanks to both of you!
Here is the passive network I am planing to use:
http://www.audioheritage.org/vbullet...4&postcount=84
http://www.audioheritage.org/vbullet...1&postcount=79
I found the french producer of the Solen fast caps (SCR), so I just need to find some good inductors (18 and 20awg according to Zilch's DCR requirements)
I don't know if I need to add a protection cap to it tho.
Zilch, if you read this, do you have some response curves of your filters without eletronic HP, and maybe some impedance curves?