Hi Folks,
I picked up a pair of 4312's at a local second hand store last week. The cabinets and covers looked good and the drivers looked great and they only wanted $20 so I bought them. I didn't realize until I got home and Googled them that they were pretty good speakers. When I got them hooked them up to my current system that has a pair of JBL Decade 26's (dumpster dive). The 4312's sound kind of dead in an A/B test. They seem to produce bass and OK mid but weak highs. The tone controls don't seem to do anything so I am guessing that the crossovers need a rebuild. They look like the first generation 4312 based on my Google searches. I can source the caps pretty easily but the pots look unusual. On the schematic I found in this forum for the early 4312 the pot is represented as a voltage divider with 2 variable resistors inside. Where do I source those? Are they custom JBL? Also should I save the old caps for authenticity? (I was thinking about putting the new caps in the old cardboard tubes but then the smaller .01mf is not encased in a tube and will clearly look new.)
I am also interested in hearing from anyone who rebuilt their crossovers as to what the difference in sound should be.
Thanks
P