As stated in the main article, we modified the original Loudspeaker Protector circuit published in July 2007 to reduce the switch-off delay in the event of an amplifier fault. This was done by removing one of the two cascaded RC low-pass filters at each input, which means that the circuit now uses single-pole filters instead.In practice, this simply involved removing a 22kΩ resistor and a 47 μF bipolar capacitor from both the left and right inputs and replacing the resistors with wire links. The filter corner frequency is essentially unchanged as the resistor value in the remaining filter in each channel is doubled from 22kΩ to 47kΩ.
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