I'm running my 604's at a crossover point of 1150.

[cradeldorf]

2.3 Inductor on the LF. 9.1 cap on the HF. 9.1 cap/15 ohm resistor for the LF zobel and a 2uf cap across the hf wires. It's the only choice I have short of having them not sound good. 515's are garbage much above 1000hz. Still deafening and still working. even being driven with my 90 watt SS amp.

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Edit: I changed the HF cap to 9.1uf