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H HHF FF o oos ssc cci iil lll lla aat tti iio oon nn: :: This safety feature prevents from damages caused by frequencies above 20 kHz (feedback, etc.) by switching the power amp off. T TTe eem mmp ppe eer rra aat ttu uur rre ee: :: Should the temperature controlled fan cooler prove to be insufficient in extreme conditions, this circuit protects the output stage transistors from destruction by switching the device off. L LLi iim mmi iit tte eer rr: :: In order to protect the loudspeakers the com