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Is the buzzing noise more like a whinning noise...that changes with the engine? If that's the case you need a better ground connection to amp. Do the subs still bump when you turn them up.? You really have'nt told us much...
Also I have never heard "on the verge of blowing" a voice coil is either good, or it's not.If it scratches when you press on the woofer, it's no good.