I've got an old set of Boston Acoustic 2.1 speakers plugged into an old Sound Blaster Live card and noticed sometimes when my computer is off the speakers will make a constant popping noise. Also sometimes when the heater in my apartment kicks on the speakers go nuts and make a loud humming noise. Is this type of interference common with computer speakers? Do newer speakers like Klipsch or Logitech have this problem? Should I consider upgrading?