Hi Mark
This is a bit discouraging.
- Mark, the stock ( original ) diaphragm in the le85 was only available in one impedance ( no matter what the foilcals say on the back of the le85 drivers ). It's closer to 11 or 12 ohms .Originally Posted by Mark T
- We "regulars" know this because the topic comes up pretty regularly / / I guess it's not that surprising that you're unaware of this .
- JBL ( at some point ) changed ( how they "interpreted" the drivers' "impedance curve" ) and then they changed the "listed" impedance .
- I'd recommend just building your hipass section according to the schematics that Zilch has published.Originally Posted by dmtp
- The response curves he has published look a lot better than what you've achieved on your own.
- He has done extensive testing of his circuit and has "shown" the type of response one can expect to get ( if you follow directions ).
- What more motivation do you need to accept the results of his hard work ?
- There's nothing wrong with wanting to understand what you're building .Originally Posted by dmtp
- One can argue that R4/R5 form another "Lpad".
- Alternatively, one can argue that R4 coupled with the preceeding variable Lpad, now form a "T" pad followed by a single "load resistor".
- Either perspective is correct. The important point to remember is that all these resistive elements represent attenuation and offer some circuit isolation .
- Good ! Use the 0.08 mH coil. That'll at least make me feel that I wasn't wasting my time when I posted the formulas for "resonant LCRs" ( much earlier within this thread ).Originally Posted by dmtp
- I believe that you've needlessly confused yourself into thinking that there should be 16 & 8 ohm versions for this crossover.Originally Posted by dmtp
- So far ( from my perspective ) there's just a single usable version for the le85. That happens to be Zilches' version ( though I feel the lowpass may still need some tweaking / we'll have to see ) .