Amplifier Noisy Output (LA4597)
You need to insert a 10K or 100K ohm stereo potentiometer in the signal path. Right now it is distorted because you are overloading the amplifier. Add this potentiometer to your circuit and adjust the volume to safe un-distorted levels.

Also, in reference to a comment below, make sure both your source and amplifier have solid signal ground connections to each other. If you hear humming sounds try using battery power to see if it clears the humming sound.

Also in reference to a comment below, you will need a 10K resistor and a 1K resistor to act as a divider per each channel. A single resistor will not reduce the signal enough.







simulate this circuit &ndash; Schematic created using CircuitLab