A few thoughts;
(A) It's impossible to know how much response your 802s have over 10K unless you measure with a program that accepts a calibration file ( from a calibrated mic ).
- You haven't said
which mic? you used with your RTA program.
- Perhaps your mic rolls off at 10K ( leading to false conclusions ).
(B)
In Review: Generally the whole idea of HF compensation is to drive ( turn up ) the HF device so that everything above 10K is just a few db's under the 1K level ( as a reference ).
- Then everything 2K-8K is turned down by some attenuation circuit ( such as the 30923 ).
- The bypass cap value determines just how broad ( or narrow ) the spectrum of attenuation is.
(C) Your diaphragm is
most likely a 20275 ( not known for extended HF response ).
- It can be replaced by GPA with a more modern ( extended ) diaphragm.
- I would recommend the 8 ohm version ( model # 34647 ) since using a lower impedance will allow you to drive the horn circuit harder ( getting a bit more UHF ) before attenuating its' midband response ( 2K-8K ) > with the 30923.
- FYI, the last version of the 9844(D) used an 8ohm driver ( 902-8B ).
- The 9844 was the pro version of your speaker.