I have 2 dell THX Altec Lansing ADA995 5.1 surround sound speaker systems on 2 different computers. Both computers make a loud snapping sound when turning on and shutting off the computer. The problem may be due to the sub has an amp which is always powered even after the computer is off. I have seen sound cards with a low pass filter and high pass filter, would either of these help prevent my problem? Is there a resister I could use to prevent this problem? I really like these speakers. Thank You, Ed