What would you like me to ask him? I believe he was the designer for that whole line, I know he was also the designer of the System C.. In fact he still uses a pair of those he says.
I turned up the volume too high a few times, and I need to find a new front tweeter, and a new rear one. Also, I am pretty sure a L-pad is fried. so, if he has any knowledge of replacement tweeters, l-pads, or anything else he thinks I might have hurt, I would love to hear. of course, a schematic would be great. Does he think they need new caps put in? Like I said before, I have had these over 25 years, and I plan on restoring them to original condition.
You have made me really want to get a pair of System B. Is the foam rotten on yours? mine seem like they are still hanging in there.
plugs... and then fresh grill cloth. and MAYBE custom stands to replace what is there an add about a foot of height...

