6 dB per Octave Passive Crossovers

[LowOhms]

Attachment 1739

Here's a crude schematic of the XO I've been using it for past year, rather satisfied with it so far. Arrived at this design after much trial and error; a great deal more error. The cabs themselves received much TLC before work began on the XOs. Cabs heavily braced; Horns each damped with 10lbs of non-drying modeling clay. Cabs sport 10in wings; horns also have side and top wings.
The throat and interior of the horns were buffed with sandpaper to remove surface imperfections caused by welding splatter.
I used decent, but not exotic components in the XO, foil inductors, metal film resisters, and surplus PIO caps bypassed with smaller values.
The amp used is a Simaudio Moon i-5080, Jolida CD-100, and an early Oracle Delphi with a Zeta arm and Koetsu Blackline Gold cartridge
Just about everything I’ve learned and applied to my Altecs was acquired from members of this site, so do appreciate any additional insight on my design.
Thank you.
Cheers

Hello SD-50.

I really appreciate you following-up as you said you would, and I am delighted to see your crossover schematic and description.

I have taken some freedom, and in the interest of sharing information with you and others, have converted your Parallel crossover to a Series crossover. Some contend Series is even better sounding, but I have no direct experience with this quite yet. In the first order ( 6 dB / octave) mode, one uses the same exact parts in Parallel and Series, very convenient !!

What is fascinating to me is the similarity between what you selected by trial and error by ear, and what Larry D. Moore selected over a number of years by ear also. Larry wrote up the hilarious story of his A7 experiences in issue number 6, of his UltraHiFi Times magazine, some years ago.

Should you (or any ALTEC enthusiast) care to be sent a copy of Larry's A7 write up, please email me at drlowmu AT gmail.com, mentioning this Altec Forum, and your moniker, and I will send his A7 crossover article promptly to anyone as an email attachment.

Cheers and thanks for contributing,

Jeff

NOTE: To clearly see the two Series A7 schematics, right click, and select " Open Link In New Window ". Click on plus / enlarge.