Safeguard Your Entire Home Theater from Harmful Power Surges While Maximizing Its Performance Sudden power surges and voltage spikes on your AC power line, caused by devices inside and outside your home, can seriously damage your flatscreen and other home theater components. Common household appliances and electronics also can generate EM and RF interference that pollutes your AC power, limiting the performance of your home theater. The comprehensive solution that blocks harmful power fluctuations and maximizes AV performance: FlatScreen Home Theater PowerCenter 400.