That is quite a sexy and brilliant setup. Wish more folks designed small mid coincedent 2-ways like those. Actually in anything readily available, I think these C3CX and larger C4CX are all there are.
That said I'm going to shoehorn in some GS42 Audiofrogs in A-pillars for a chance at one footprint but 200hz or so all the way up from above the dash. THAT would be a fun head to head comparison. I know Richard Papasin had an awesome setup in the same car running C4CX's. Quite the A-pillar challenge though.
C3CX would certainly be a tad easier but I've always picked the hard road I guess.
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2008 Civic Si Sedan - Fiio X5ii SPDIF, Phone USB HEC, Helix DSP Pro-2, Helix Director, JL XD1000/5v2 (2), Audiofrog GB10/GB25/GB60, Acoustic Elegance SBP12 (2) Build Log
Odd review. Clearly not edited by anyone who understands geometry. (Unless the midbass is actually an 18 - see claimed Sd). Also, from the pics it is clear that the MT unit is a standard stick-coax (with a short stick) rather than a real coincident driver.