Im not to good at repairs but figured I could handle this one, maybe i was wrong but I have had a set of mid 1950s C36s(D131 and 075 and N2600 crossover) for awhile now and have tried them with so many amps its not funny, everything from tubes to SS and the same results with both. Dont get me wrong they sound good BUT Im sure they could sound allot better. First off the highs are so high they are shrilling(appropriate word) and the Bass is lacking. The only time I really do enjoy them is with the bass turned up all the way on any amp and the tweeters almost shut down thru the crossover. SO I was gonna start with recapping the crossovers and see if that didnt help(they are over 50 years old so it cant hurt) and if that didnt help I was gonna have the woofers reconed and see if that helped. Well Im into the crossovers and I could use some advise on what the heck these grey boxes are. Ive never seen anything like them in any crossover Ive ever looked at, but then again Ive never opened up a crossover that was over 50 years old. Any help would be appreciated and thanks in advance.