Steren BOOM-100 Manual De Instrucciones página 28

BASS AND TREBLE ADJUSTMENT
Press EQ to adjust bass then press the
Vol - and Vol + to change from -7 to 7, press EQ again to adjust treble and
choose from -7 to 7, according to your preference, when you finish adjusting
wait 2 seconds and will automatically switch to normal operation mode.
EQ