hron61 I never inferred that PWK didn't know what he was doing.
My question was only in the configuration of the crossover's and if there was a difference between Heresy's with or without speaker grills.
There is a sound quality difference without speaker grills.
When PWK engineered, the circuit boards / components, were there changes to the crossovers frequency with cloth grill covers? Somehow my Birch Plywood sound different than the Walnut series.
Not sure if it makes a difference but should each driver be fused, or should it be all in one? Looking like a 2.5 Amp quick blow fuse is correct, maybe.