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

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


Karlson Evangelist



Edits: 01/01/17 01/01/17 01/01/17 01/01/17 01/01/17

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  • RE: altec 414-16b and 902-8t with 511b - freddyi 01:23:18 01/01/17 (0)

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