What is the difference between analog and digital mixers?
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An analog mixer uses transistors as amplifiers throughout the entire signal pathway. The transistors will get various volts input according to the audio signals and then output the same voltage in its output. It is then possible to do simple analog operations using these transistors and resistors to add or multiply signals together.
Digital mixers however only drive the transistors at maximum or no voltage. The transistors work better in this mode as there is no ambiguity in what signal they represent but it does also limit what they can represent. For each input you would have an analog to digital converter which is a circuit that outputs digital numbers for the voltage level. These numbers are then sent through transistors that do numerical operations on them, such as additions and multiplications. The output is then sent through a digital to analog converter which converts the numbers back to an analog voltage signal which can be sent to a power amplifier.
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