Hello, I have a pair of M-Audio Studiophile AV 40 speakers connected via the 3.5 headphone socket of my laptop to the phono L+R line in socket on the speakers. They are great sounding speakers but have found there is a lot of static on the volume knob and most times when I turn up or down it cuts out to one side and sounds really muffled.Is there any way of removing the static build up as it is really irratating me when I adjust the volume.