Check speakers with another audio source, such as a portable CD player. Holding down the Mode button continuously for three seconds will automatically restore default settings. Optimal system mode settings are permanently stored in your HK 595 speaker system. Subwoofer emits a loud hum or buzzing noise. Check input cable connection.
Speaker system experiences radio frequency interference or picks up a radio station.
Wrap up excess input cable in order to make as short as possible. Purchase a ferrite clamp and attach over input cable. A clamp can be purchased at your local electronics store.