Led Indicator - Audio Pro ADDON SUB Owner's Manual

features
pHase, norMal or reVersed
reversing phase (0 or 180 degrees) is useful when placing
subwoofer in different room environments.
try shifting phase if you experience too little bass.
on - aUto - off
on - subwoofer is always on.
aUto - subwoofer starts automatically when receiving sound signal.
off - subwoofer is set to off.
crossoVer
adjust upper crossover frequency between 50 to 130Hz.
adjust to match your speakers.
leVel
adjust volume level of subwoofer.
lfe inpUt
connect to lfe input if you want your Home theater receiver to
handle upper crossover frequency. crossover adjustment in the
subwoofer is disabled.

led indicator

led shows green for on, red for standby.
6