There may be a simple solution if you have trouble with your Harman Kardon sound system. Problems with Harman Kardon sound systems can often be traced back to loose or broken connections. If you notice any wires that seem loose or your System is not producing the sounds it used to, it may be time to take it into a repair shop and check the connections. In addition to checking for loose connections, another common issue with Harman Kardon systems is a need for more power. If your System isn’t getting enough power from the wall outlet, it may need to be replaced.