How do I test my RCA cable output?
What should RCA voltage be?
A good quality RCA audio source should have a voltage rating around 1-2 Volts and a low impedance. The voltage is the “strength” of the signal and the “impedance” relates to signal integrity once the RCA is plugged into the amplifier.
How do you measure preamp output voltage?
You can use one of the online sine wave generators or an mp3 sine wave sample of 400Hz. Just play it through your pre-amp and measure the output level with the multimeter set to measure AC voltage. This should give you an accurate measure of the output levels of both channels.