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Axe-Master
oh man, I tried these Man-O-War speakers.
Worst speaker I ever tried and I tried many different brands including all from celestions with dozen of different tube amps.
Maybe try to switch the speakers first, try for example Celestion Alnico Creams or UK Mesa V30´s and I am pretty sure you will leave filter block out of equation.
Those speakers are the weakest of weak links. Said much the same thing myself. If it's all you have, though,
then it may not be an option to burn them, and then bury the ashes, and then forget you ever owned them.