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Connects the car radio's audio output to the amplifier's low-level input for channels 1 and 2.
Connects the car radio's speaker output to the amplifier's high-level input for channels 1 and 2.
Adjusts the input sensitivity for channels 1 and 2 to match the audio output level.
Connects car radio audio to the amplifier's low-level input for channels 3 and 4.
Connects car radio speaker output to the amplifier's high-level input for channels 3 and 4.
Adjusts the input gain for channels 3 and 4 based on the audio output.
Selects a complete frequency range (full bandwidth) for channels 1 and 2.
Sets the cut-off frequency for the high-pass filter between 30 to 600 Hz.
Selects a complete frequency range for channels 3 and 4.
Selects the low-pass filter for low frequency response on channels 3 and 4.
Selects the high-pass filter for high frequency response on channels 3 and 4.
Selects band-pass filter for frequency ranges on channels 3 and 4.
Sets cut-off frequency for low/high pass filters between 30 to 600 Hz.