Class D are more efficient, generate less heat for a given output. Historically they are noted for more THD than class AB, less so for more modern designs. Given the inherent issues in a moving automotive environment, the point is essentially moot; ours is hardly an ideal listening environment. (After all, Bose OEM systems sound pretty good in cars; ever hear them A/B compared to anything remotely good in the home?) So, decent power, decent speakers? You'll be fine.
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