I'm not a fan of kickpanels, experimented with those in the Z. Could have done the same sound stage modification with the Time Correction... but then I purchased them my HU at the time didn't support it. Live and learn. The lack of footwell space is vast. I have three way components there and did also consider the Bi-Amp setup for the headache it's just not worth it as I'm not trying to win a competition, the entire vehicle isn't sound deadened, etc. I only have 75/channel on those and they sound nice. With double that I'd be suprised I'm sure still with the three way x-over.
Yes, 24s I run when I have a single woofer. 12s without. 24s without a woofer doesn't sound proper to me, there's simply no midbass response.
While laughing at headunit amps, some only respond from 45-15000Hz.
It's amazing to me when I try to tell people a small solid state amp that's even 30x4 will over power and blow away any headunit and I'm not taken seriously.
My amps aren't fully cranked either on the larger ones, they're maybe 1/3 to 1/2 at the most, I'm after quality not quantity here. I was thinking for some quality 4" for the dash, same with the rear fill, and a single woofer. I'm not expecting much from those 4" speakers minus some fill. I'd have to bandpass I suppose the front door ones to get some response, not really what I had planned would fill the front with a lot better sound too.