The radio's spec is 10A max... the sub (I havent got behind the panel in the trunk to look at type/specs... but assuming 20A average, and depends heavily on content.
I have no idea what the distributor draws when engine running.
fwiw ...after killing an expensive (in Oz) Redtop I now have a 83Fd supercapacitor hanging across the Yellowtop to limit the impact of multiple starts on the longevity of the battery ... 9months in and working fine... maybe black magic and only time will tell how effective it is with the battery.