Still no pic's.
There are two
PRV 69MR500 PHP-4 6"x9" midrange speakers in the rear dash. The FR graph and T/S Parameters are there ... for TLS.
They are being run from the rear RCA's from the head unit. The front RCA's are piped to the 4 doors.
My head unit lets me set a 250 Hz HP filter w/ a 24db/oct slope on the rear speakers. I need a passive LP filter design, somewhere around 3.5K Hz and maybe a 2nd order slope before what I imagine to be cone break up.
It starts climbing ~ 200 Hz and the highest peak is ~ 4.5K Hz.
+/- 5db from 400 Hz to ~ 4K Hz.
Plus I wonder if these speakers would benefit from an enclosure. With the back seat up, they're in the same trunk space as the dual 10" subs. Being in the rear dash messes up the sound stage/imaging BUT they sound great with vocals. I've tried relying mostly on the front door speakers, less on the rear door speakers and even less on these rear dash speakers.
An enclosure size and a HP filter design ... that's all I'm asking.
BTW, from outside the car ... and for at least a block away, this thing cranks.
Pic's today and I'm not BS'ing you this time.