Transmission line enclosure, I believe (I have yet to take my out - too busy driving; but I don't really agree with the sound the stock Bose puts out). If it's a short transmission line length, the Fs of the woofer needs to go up.
If the transmission line is 1-2 feet though, the resonant frequency shouldn't be any higher than 200-300Hz, however.
And yes, I agree - Bose = pure marketing magic. I doubt you'd wanna test out the woofer (or speaks) - it just might scare you. Remember the Acoustimass measurement debacle?
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40th Anniversary Z - 3M Paint Protection Film, CA Legal Tint! (70/40)
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