140 Bose system (again)

i've done a search on this topic and not too much has come up. On the MBUSA web site it says my 500SEL has an 11 speaker bose beta sound system. I only count 10 speakers...two in each of the front doors (4), one in each rear door (2), and four in the rear deck (4)...there seem to be grills in the dashboard but that would make 12 speakers so I assume there's no speakers there. Is there a hidden subwoofer or something somewhere? I'm planning on upgrading to a clarion head unit and MB Quart speakers all around, not sure about amps yet...seems like it'll be a big job. Thanks for any info you can provide.

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Chris Singh
1983 300D
1990 300E Black Pearl Monotone w/ chrome AMG monoblock II 17", custom multimedia system

1993 500SEL brilliant silver w/ AMG monoblock II 19"

http://benz.mp3car.com
http://stormworks.max3d.com