When you know your 3 y/o son was in your office
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Ooof - has that damaged the speaker??
I wonder if that gives an idea for some fantastic mini subwoofer for more bass at your feet at the desk? 
Not at all. The speaker opening is conical in shape on the QS so the adapter rested on the interior taper of said opening, never reaching the speaker.
Apple has the weirdest adapters