I've built a pair of Model 19 style cabinets and populated with 416z and GPA 902 drivers. Previously I ran it bi-amplified. I'm going back to the original passive x/o scaled to 16 ohms. When it comes to the coils, I'm having difficulty getting the smaller values in iron core, as the originals were. Anyone know the iron core resistances? I'll use air core and tack on a series resistor.
thanks.
Les
Hmm, double the resistance, double the inductance.
GM
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
Halve the caps. Thanks GM
What appears to be an excerpt from an Altec engineering schematic for the model 19 crossover is posted in this thread.
Also, member RonSSS had done some measurements of his original N1201 crossover inductors. There were separate posts for inductance and resistance.
Depending on the impedance curve of the 416z's, you may or may not want to fully double the DCRs of L1 and L2 when adjusting for a 16-ohm woofer. The N1201 provides CD compensation and while it is a small effect, the resistance within the HF and MF circuits affect the voltages for the LF filter as well. It will be tricky to swap out drivers and retain the intended M19 voice.
Last edited by Alien_Shore; September 8th, 2015 at 01:59 PM.
- Mike
Thanks Mike.
Anyone know what type of caps were used in the original M19 x/0?
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