Oct 16, 2016
Pretty sure there isn't one for treble. Only adjustment for bass. This does make the ST300 not really a good product to own since competitors have option for treble. Big failure on Bose for sure.
Dec 5, 2016
Thanks for the question. GuyInPA75 is correct that there aren't any direct treble adjustments for the system at this time.
You can, however, run AdaptiQ and calibrate the system for your listening area. This may help with audio adjustment.