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Power conditioners with this feature can turn off their outputs and
hence connected equipment in the event of a potentially damaging and
prolonged under or over voltage condition. Turn off points vary from manufacturer to manufacturer but could be generalized as below 90V or above 140V.
Torus Power‘s AVR and AVR2 models and selected SurgeX models incorporate under / over voltage protection.
"No other subwoofer system I’ve owned even comes close to what this room delivers. Reaching out to Acoustic Frontiers was one of the best decisions I’ve made—I highly recommend working with them if you want to get the most out of your theater."

Nyal Mellor, Founder, Acoustic Frontiers
Nyal Mellor
Author