Altec N-1600-A crossover schematic.

[Earl K]

I have no idea, It's a series crossover I think. I don't really get how it works. They used the inductor to attenuate the HF. I was thinking of building a pair but I wouldn't be able to do the taps on the inductors. All I would be able to do is build an un-attenable one. I wonder if I could use another small inductor to imitate the original attenuation or if it wouldn't work because it has to be part of the LF inductor?

- Here's a calculator ( from LHF ) that might help you build your own autotransformer ( though , I've never used it ).

- Ostensibly, your coils should be kept together so that they are working as a single, unified inductor / but the problem with that, is that Mutual Inductance of all the coils together gives a final inductance figure that is larger than the sums ( of the individual coils ) .

- ie; One can't simply add a .75mH coil onto a 2.25mH coil and expect the resulting coils inductance will be 3 mH ( assuming you stack the coils in their proper orientation & that they are wired in series the result will be larger than 3 mH ) .



- Running one example ( to find the winding ratio for the -6 db point ) is; power of 10^(-6/20) = .5012

- Running another ( to find the winding ratio for the -3 db point ) is; power of 10^(-3/20) = .708

[Panomaniac]

It's not a series crossover as far as I can see. Normal 2nd order low pass with variable L on the woofer, 1st order high pass (cap) on the tweeter. Unless I don't understand the drawing. Is the horn connected into the spiral switchy thing?

[rontec]

To me it seems to be a 2nd order (12db slope). The 16uf cap and the .92mh coil are doing double duty.
The 16uf cap is bypassing HF to the tweeter but also shunting HF from the woofer. Same is true of the
.92mh coil. It's shunting LF away from the tweeter and bypassing LF to the woofer.That's how it looks to me
anyway , but I'm sure the experts here will clarify!