I just finished Jeff Markwart?s simplified XO for my 604-8Ks and they are excellent, superior to the stock Altec XO. Using better parts as well, Solen coils, PIO and Teflon caps, mil-spec silver/copper Teflon wire.

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Quote Originally Posted by BillWojo View Post
I picked up the crossovers today. Pulled the cover off of one and boy do they look like a PIA to rebuild. They look similar to Model 19 crossovers in the layout but the aluminum panel is bent up on the end about 3" instead of being flat. Blocks easy access to the terminal strip. Add the mess of wires crossing over top of the terminal strips and most of the components are buried under a mass of wires.
There are two L-pads, three transformer type inductors, an EQ pushbutton switch with no less than ten wires and one jumper attached. Plus four ceramic resistors and five capacitors. Needless to say, it's kind of busy in that box.
I have searched for a schematic but can't find anything on the 904-8A crossover. Does anyone have one they could share?
Thanks

BillWojo
Rewire my 604-8k XOs with 16g Teflon mil-spec wire, PIA! Sounded much better after replacing the grotty stock wire, but not as good as Jeff Markwarts model.