Thanks so very much for this Allen !

I'm always very thankfull when someone takes the time to expose the workings of an older network such as this . We all benefit by these efforts / so thanks again !

Does it look right ?

- Yes, electrically your layout is very workable ( when designing for an @ 1500 to 1600hz acoustic crossover point ) .
- The component layout ( visually ) on your drawing is fairly unconventional ( & may confuse untrained eyes ) / but it's the eletrical layout that matters here .

FYI ;

  • L1 & L2 could be in the neighbourhood of 1.2 mH for a standard "B2 filter" rolloff ( B2 = 2nd order ButterWorth filter ) .
  • L3 ( at that location ) would need to be @ .075 to .20 mH to function properly and do anything of importance to the HF filtering .
  • VR1 should be a standard type 8 ohm variable Lpad ( 100 watt ) .
  • The values of the capacitors do "ball-park" to where I would expect them ( ie; knowing the components somewhat , as well as Altecs' standard approach to dealing with the FR curves of those components ) .
- It would be nice to have your layout confirmed by a second set of eyes on another network ( before declaring this all correct ) .

<> cheers EarlK