Vincent,
I suspect that you are not properly set up, or have not really turned up the volume.
Lets look at the volume first. WITH THE EXCEPTION OF THE SUBWOOFER, ALL THE VOLUME SIDERS MUST BE SET AT MAXIMUM. THE SUB SHOULD BE SET AT APPROXIMATELY 25 PERCENT OF MAXIMUM.
While the MAIN VOLUME may read maximum on the displays slider bar, you still have several BOOST LEVELS to go through before you are anywhere near max. Merely continue turning the volume knob until you get into the BOOST levels and you can go up to Boost 11, which will blow the windows out of your house.
TRY THIS FIRST and let us know what happens,
Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)