A friend is a studio and stage musician. He complains that his guitar amp is very sensitive to power quality in clubs and theaters. They tried something called “Brown Box” with limited success.
His tech, who is an audiophile, suggested they try a P20 and they’re over the moon delighted with the results.
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Who said a P20 wouldn’t help in that scenario…right 
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Oooh forgot anotherr advantage…your friend ought to try multi wave
in it’s various settings and see how this could further benefit his
guitar amp.
Best wishes