A little somethin', somethin' to throw out here for you humbucker owners! Do like prefer your humbuckers covered......or exposed (or open coil)? Now exposed bobbins are cool lookin' an' all, but I prefer covers on mine. Can't have it both ways 'cause I currently only have one guitar with 'em.
And no, I for one don't hear any "audible" difference between havin' exposed ones versus covered ones. Maybe 'cause I ain't been in my twenties in forty years. I do know the pickup’s magnetic field may be affected by the cover’s plating materials, so as a result brightness may be reduced by nickel, chrome, or gold plating, but as I stated, I wouldn't be able to tell as the amount would be very subtle.