[Khorn Distortion Root Cause?]

Good suggestions guys.   Let me run down these ideas and see if I can identify the source.   👌👌

[Khorn Distortion Root Cause?]

It seems my Khorn experiences some distortion at certain frequencies / tone while listening to music.    Id say the problem area is in the mid range.    Very difficult to discern. 

My problem is Im not sure of its source....mid or hi horn.    (I fairly certain its not the low freq woofer.)      

Even placing my ear close to the horns leaves me uncertain.     

 

1) Any ideas how to find the source?   Maybe thru a strategic process of DIY elimination tricks?

2) Could a bad diaphragm cause this?

 

My components are:   (Hi-Crites CT125, Mid - Atlas Sound PD5VH, x- B&K Type A/4500)  (Parasound A21+ P3 Preamp)