For the last year or so I have been building a multicell mid-bass horn, purchasing two used JBL2446H drivers, along with putting together a measurement system. The horns are built, I have been testing the JBL drivers and have some data to post and inquire about interpreting some of the graphs
All the graphs are driver alone, no horn. I used REW software, with a Mini DSP mic. The mic was positioned 2 inches away from the driver exit. Below are measurement graphs:
SPL + Phase
Impulse
Spectrograph
Waterfall
Impedance
Distortion
My concerns are the spectrograph, impulse, along with the impedance graph with the large second spike at 1300 Hz, as this is within my midrange horns coverage. I have performed frequency sweeps, played music with the horns and cannot detect any obvious issues, other than a frequency response rise at 1300Hz, which I believe is associated with the impedance rise at that frequency.
Does the spectrograph look normal, or is that proof of a damaged diaphragm?
Dose the Impulse file look normal, or does the graph show ringing?
Any help is appreciated
Tom in Lafayette