Specs for factory ~4" Infinity/JBL Mid Dash Speaker?

The ~4" mid dash speaker is making a noise akin to when the insulation of or the foam has a loss of integrity and will replace it. I have the upgraded Infinity/JBL audio system. I removed the full range (not coaxial) mid-range speaker to try to identify the impedance, OEM model #, etc. I could only find a JBL sticker with the OEM model #96350C6000. I used a meter to estimate the impedance @ 4 ohms (meter registered ~3.5 and I read that these measurements are within range for a 4 ohm unit). I have not been able to find any info. About the OEM speaker's freq. Response and RMS ratings for min and peak. This info. Would be helpful for finding a system compatible with aftermarket speaker. Of course, I will then have a challenge finding one that fits the internal dashboard mounts, but that's another fish to fry. BTW, the OEM replacement is around $240 - not going to happen.

Many thanks,
-Doug