Quick question here. Are the lightbulbs supposed to kinda flash with the music, or is this a sign that there's a problem? Never had a crossover with a lightbulb in 'em . . . my g/f was driving last night and said she started to notice a burning smell . . . turned down the gain this morning and I don't notice anything, but the crossovers are mounted in the trunk and I noticed the bulbs on both of 'em are pulsing with the music. Is this an urgent situation or normal operation?