http://www.whatsinside.info/bose-acoustimass-10-seri…e-transparent-02/ и http://products.bose.com/pdf/customer_service/owners/am10ii_guide.pdf
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Speaker driver complement
Cube arrays: two 2.50-inch Twiddler TM speakers
Acoustimass module:
three
5.25-inch woofers
for left front,
center, right front,
and surround
channels