The onboard sound system was never designed to be used as a PA system. However,when the volume is set at about the 1:00 O'clock position, the overall quality is astounding, IMO, especially when you consider there is only about 10-watts per channel to work with.
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.)