Yeah, Bill â€“ thatâ€™s C4 and R3, in parallel with L4, the final the notch filter.
What I find even more interesting is that they put a second 100 watt resistor array in there, and they stuck it right on top of coil L3, so I canâ€™t see the part number. It should be 616-00076-00 if itâ€™s the same as the schematic. But that big 4-part resistor â€“ I canâ€™t see whatâ€™s hooked to it, either. The one end appears to be grounded, the other end is too hard to see. It might be in the woofer circuit, to pad down the woofers, after all. Remember, for them ground is going to be +. There are two separate four-in-parallel sets of 25 watt resistors here. The one set for the ribbons is normal, but in the Plat. Schematic, all the woofer duties are done by C1 and L1; no other big resistor. I'm really not familiar with the Original woofers, except that they were different, and not just to look at. C1 here is not 450 ufd either, but a parallel combo yielding 376 ufd. L1 is the stock metal-core coil, used for Plats and Silvers both.
All in all, mariodawg, it looks like they just took some regular Platinum crossovers from stock and modded them a bit for the upgrade kits. The date stamped on the one coil is Jan 5, 1995.
Your silver colored cap that failed (C2) is rated 100 volts, but C2 in the schematic calls for 150 volts. That shouldnâ€™t be a problem unless you have a real monster amp, and use it flat out. But since it failed, you might want to search out a 150v rating for your final version. Whatever you do to one channel, of course, you should do to the other.
Those four resistors that lie flat atop the mystery coil: if you could gently lift them up, with their silicone sealant that holds them, you should find a part number on that coil. You can later renew the bond with a little fresh silicone of your own.
Then I need a better picture, or description of where the ends of that resistor array go. If I had to guess, Iâ€™d reckon itâ€™s a series resistor on the black lead to the woofer array. But guesswork is bad work.
Anyway, I now just about have a complete schematic, save the few things mentioned.
Going to bed now,
"You know what folks? I'm happy."