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RE: altec 414-16b and 902-8t with 511b

Posted by freddyi on January 1, 2017 at 01:23:18:
also ask over at Lansing Heritage
a crossover properly designed provides a good summation of the drivers and protects the delicate high frequency driver from being destroyed by lower frequencies.
LINKS - Lansing Heritage
http://www.audioheritage.org/vbulletin/forumdisplay.php?6-General-Audio-
Discussion
Pi Speakers Audio Roundtable - you might PM Wayne
http://audioroundtable.com/forum/index.php?t=thread&frm_id=33
JE Labs
JE Labs 2-way altec horn page
http://jelabs.blogspot.com/2014/01/altec-2-way-horn-system-redux.html
JE Labs update crossover to contour the HF
http://jelabs.blogspot.com/2014/01/altec-2-way-xo-update.html
IF 414 variants are always 16 ohm (?), then I guess JE Labs early try with the N1600 would work to get you started - I'm not sure where to source the 30 ohm potentiometer. You could use two terminals of an L-pad in place of the pot.
here's the basic diagram of a parallel 2-way crossover with 12dB electrical slopes - if inductor L1 and capacitor C2 were removed then it would be 1st order and 6dB per octave electrical slopes
here's a 6dB per octave series crossover schematic - JE Labs is using a simple series network with their 414 and Altec compression driver and claims it sounds better than whatever parallel network they tried
the series type works in a kinda see-saw fashion. At high frequencies, the coil's impedance is relatively high and the cap's impedance low and vice versa for low frequencies