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Originally, Blazers had the speaker mounted under the dash as the picture shows. Remember that this was designed as a topless vehicle. I think they were afraid that water would get in the speaker mounted in the top of the dash. A bunch of '72s came with regular truck dashes with the speaker in the normal truck position. They may have been using up stock of truck dashes, plus by then GM realized that every Blazer/Jimmy was being sold with a top anyway, and people rarely took them off.
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Tim
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