"Isaac Wingfield"
"Phil Allison"

Could this explain the phase shift you are seeing?

** No.

Static phase shift was simply adjusted out by positioning the mic at a spot
where the drive voltage and sound pressure were in phase as is evidenced by
the lissajous pattern becoming a line - only the additional shift from
the low frequency cone movement was being observed.


What happens if, instead of changing cone excursion by changing the
frequency, you keep
the frequency constant and adjust the amplitude?


** The phase shift is proportional to cone displacement - as I already
stated.

Cone velocity did not alter the peak amplitude of the oscillating
phase shift.




............ Phil