[Texbychoice]

After several months of experimenting with crossover mods, finished - Maybe.  High quality caps, resistors, and air core inductors.  Also swapped in a GR Research M165 driver.  Very pleased with the sound quality.  Clean, detailed, and smooth to my ears.  Did a near field measurement in my listening room with UMIK-1 and REW software.
Mic at 0.5m, 5mS window, 1/6 octave smoothing, no EQ.  Think have reached the point of diminishing returns?  Close enough to smooth out with EQ? Thoughts?

[jostber]

What replacement do you think had the most positive effect on the sound quality? Did f.ex. changing to the air core inductors improve things?

[S Clark]

I'm confused. Did you measure this in a box?  The M165 is a versatile driver, but how you measured it will make a huge difference.