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Were old PPI flat piston subs just shallow mount or a different purpose?
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I was just curious. Knew people that raved about theirs, just remembered about them, what was the point? or was special about them? lol
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had 6 batteries out of Alma's vehicle, signed by her in gold paint marker. =)
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Those PPI cones were a very stiff honeycomb-like design. I think it was for a very rigid cone which wouldnt deform like a normal cone could...
Definitely not shallow mount, they were full bore subs.