OK------Laney half stack (300 watts, 4x10)-----sounds great, not a lot of mileage on it, but notice when volume is at about 5 or up. and am using phaser/flanger mix, that I get a loud snap or crack sound every now and then, as though the speakers don't like it. I can play with distortion or clean, no problem. Is the phaser/flanger doing some weird push/pull thing on the speakers or what? Anybody have a technical explanation for something like this?