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Lets face it friends, most 928's are not great listening environments for anything but motor music...
Some induction sound systems have 8 phased array speakers!
Exhaust speakers (base) are usually in good ol fashioned stereo...
Add this to the list for both an early and late 928. Early because it was released in 1970, and late because it was prominently featured in the movie Twister in 1996.