I rebuilt and altered the crossover circuit on the worse of the two speakers. Check it, here’s the new crossover. I kept the original coils, but moved them so they’re out of plane with each other, which matters for clarity and prevention of crosstalk.


New Crossover
The numbers on the board are kind of wrong, those were what was there before, plus or minus 20%, except for the one that had pretty much completely failed from age. That’s okay, electrolytics do that. That’s why I went with film.

I made a phone recording, just using the built-in microphone. The last recording, of the other speaker, I was able to get it sounding reasonable through inappropriate use of EQ once I got the tweeter to come back online. Even that was a huge step up from where it had been.

This recording? Purely flat equalisation. Absolutely flat. Played off an iPod through my Sampson amp, into the speaker, recorded via phone mic.

Whaddya think, sirs?
 

This post is part of a series on restoring infamous vintage stage monitors. Spoiler: they made good, in the end.