- Okay, my best guess ( for Tues. ) is that the "tight-pack" layout of Todds' construction is forcing the .8mH coil into being a larger "virtual" value. I'll have to try some parts substitutions ( Wed. ) to see what value coil would cause this lower reading in F3 . ( Coils interact with other coils when placed in close proximity )
- In the meantime Zilch, you should verify Todds F3 numbers . Once finished ; lift the .8 mH coil from its' present location / extend with 12" of wire on either end of the coil/ replace the "new coil" into the circuit & remeasure the horns' F3 for its' high-pass .
- A couple of notes ; the .6 mH coil in the 3105 omits the use of both 20 ohm load resistors ( compared to the 3106 ) . Todds use of .5 mH coils begs the question ; "What about the usage of load resistors ? Impedance plots should be run with & without the resistors inplace . Then full voltage runs should be worked-up for each scenario so one can study the consequences of ad hac parts substitution .
- My opinion, on the whole is pretty well beside the point / except to say / both Todds' and your declarations, that this "workedup design" is a done deal and ready to implement ,,, is vastly overstated - to put it mildly.
- A study of the actual derived "acoustic" slopes is enlightening .
regards