N1600 crossovers for my 604Ds

[alancohen]

Thanks CD and Don. As far as I can glean, the 604D is identical to the 604C. I found this page:

Altec 604's - the various models

Where it says:

Altec 604D (looked just like 604C)
HF horn: 90h40v
X-over: 1600 Hz
Power: 35 watts, 50 peak
Impedance: 16 ohms
Weight: 40 lb.
Magnet: Alnico
Response: 30Hz - 22kHz
Free Air Resonance:
Frame: green hammer-tone
Cone: all paper cone
comment: 604D was in the 1957 catalog and was not superceded by the 605 until 1959
after that 604Ds were built one-off for special customers i.e. recording studios

I have read this same info elsewhere.

I have seen Jeffs XOs for 604Bs w/E cones as well as 8Gs, but nothing for the 604C. I like the idea of a little time delay.

To add to the confusion, mine were reconed by GPA. I guess I should call Bill and see what he might have put in there and what he would suggest. He's got XOs but they're $178/ea. I think I could come in at half that if I build my own.

Here's a pic of the cones on mine: