Audio Speaker Configuration for 67 Dart Convertible

Planning my system in my 67' Dart convertible now. I'm worried about both the sound and the lack of security, since a thief can just cut the top to gain access. I've decided to use a bluetooth amplifier (hidden) to play Pandora from my phone, the same as I use in my 2015 Mazda daily-driver. That way the AM radio stays in the dash for appearances (and thieves), and my "stereo" (phone) goes with me.

I bought a pair of the 4x6 kick panels for the front, and I'm looking at a single (or dual) powered under-seat subwoofers for the front seats (the BT amp has preamp outputs). Hoping this provides enough sound for top-down driving. We'll see.

vm