Re: coaxial for tj wrangler - soundbar
Honestly, speakers in the soundbar are not necessary. I moved my sound pods to the rear of the roll bar and put 6.5" CDT Coax's in just for rear passengers with the top off. With the top on, my 5.25" CDT Comp set is plenty. If you do put anything in the rear, don't leave the speaker pods in the stock location. The proximity to your ears and odd placement REALLY screws up imaging.
2 RE Audio SR10 D4's in 2ft^3 tuned to 32.5hz
CDT Comps front, CDT Coaxials rear, MBQ DSC480
Diamond D312D2 in 2ft^3 tuned to 34hz powered by a Diamond D3400.2
2 Ascendant Audio Assasin 8's in 1.2ft^3 tuned to 40hz.
All in a red '04 Jeep Wrangler.