Given the rear parcel shelf speaker's size (16.5cm) and the fact that they are not sophisticated dual cone units they can only reproduce low frequencies. The door units are middle range units which re-inforce bass by the use of a bass reflex unit (i.e. an enclosed space which is resonant at low frequencies) which reinforces the bass frequencies projected by the speaker cone as well as projecting some bass through the open ports you can see in the picture. The 3cm high range units are in the top of the door just deal with high freqs.
It would be interesting to find out the cross over frequencies at the amp to see what frequency range they feed each speaker but I did find this:
"Bose does not publish frequency specifications. The reason for this is
that we believe that such statistics do not add very much to an
understanding of an audio product's acoustic characteristics and, even worse,
can be misleading....... [more waffle]"
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2002 D2 S8 – Ming Blue, Valcona leather, Vavona wood insert, solar sunroof (to be fitted), Heated rear seats, extended leather pack, 18” Avus, ski hatch, Bose, auto dim rear view mirror, rear blind.
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1st November 2013, 11:05 AM
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