An LDR is a combination of a photo resistor and an LED in a sealed package. Power is required to control the resistance level of an LDR. The external power supply is used solely to control brightness running through the LED. It is completely isolated from the audio signal. The signal from a source only passes through an LDR and a short length of copper wire. Sissener believes that the LDR and short length of wire do not have an audible affect upon the signal.
Tortuga Audio is the only company using a digitally controlled analog LDR. There is a microprocessor inside the preamp which controls the LDR. Tortuga Audio is one of a few which uses LDRs to control volume. Read the full review at Audiophilia.
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