Is it possible to stop or reduce the popping sound which is emitted from the speaker when you turn on and off an amplifier? i am using a PAM8403 connected to a 4ohm speaker. i am switching using a low side mosfet connected to an arduino. Thanks.
Use the MUTE or SHDN inputs of the PAM8403 (pin 5 or 12) with your arduino instead of switching with a MOSFET. Popping sound will be greatly reduced. Also, put an high pass filter on the inputs as shown in the datasheet. Its cutoff frequency should match your speakers' bandwidth.