What a great site!
Hearing that I had built some speakers, my cousin asked me to look at his speakers, which it turned out were a pair of L200 Studio Masters. He said he'd bought them new in the mid-70s and they had "never sounded right." After dragging them out (he had one firing into the side of a couch), he was right -- one sounded dramatically different from the other, like the upper bass was largely MIA.
I had nothing with me, not even a multimeter, but eliminated a few obvious possibilities (tightened drivers, reversed amp channels, checked for phase). To make a long story short, I could find nothing obviously wrong (need that meter, but the drivers seem hooked up properly, surrounds OK). The only thing I can think of is that there's something going on in the crossover, which turned out to be a metal box attached to the back (inside) of the terminal plate on the back. It was getting late, and I decided not to press it after a couple of glasses of wine.
All of which lead to my questions:
1. Has anyone run into this before? The speakers really do sound quite different. Any suggestions?
2. How do I get into the crossover box? (There were a couple of bolts that looked like they need an Allen wrench, but the holes looked round, not hex.)
3. The boxes haven't been treated since the day he bought them. They look fine, just dry as the desert. What should I get for him to restore them?
Thanks in advance for your help.
Elektratig