Up date on these.
Months back I went too far with the bison kit doping so with them being aluminium continuous profile cones I thought I would put the speakers on their backs and soak the bison kit in white spirits. Left it a week and I managed to remove it without damaging the cone
They have been sat since I did that months ago, unloved and forgotten. Anyway last week I decided to take a different approach. Sprayed the mid bass with plasidip and left it at that. The tweeter is already doped on the inside with plastidip. 3.3uf Russian pio cap remains along with a 3r9 resistor.
Put the speakers back in to the system yesterday for a try out. Was not expecting much. This time I have them much nearer the wall. Anyway, they are very addictive even though I need to do more to them. They are the tightest speakers I have ever heard, remarkably so - all that steel has definitely done the trick. Moving them nearer the wall has increased bass but they still are a bit light - maybe this is not fair as I am no longer listening to the box singing and I am used to my big isobaric bass cubes. The clarity of all the frequencies is wonderful
Also I think the resistor needs to go as the treble is a bit quiet. Might play with cap size as well. Plastidip only has had a surprising effect on things.
Stu