Why does my amp make a popping noise when I turn it off?

Why does my amp make a popping noise when I turn it off? 

It’s because the amp was using electricity, and when you turn it off the speakers pick up the stopping of the electrical current through the amp.

Why do my subs pop when I turn my car off? 

What can be causing this is the audio signal before the amp is shutting off before the amplifier(s) turn off. This causes the popping sound. More than likely the DSP is turning off before the amps. This is sorta like yanking the RCA cables to the amp while the system is running.

What causes a speaker to make a popping sound? 

Speaker popping and crackling are caused by interrupted electrical current (audio signals) or, in other words, a loose or dirty connection. To fix crackling and popping, troubleshoot the connective wires to find the problem area and secure the connection and/or replace the cable.

How do I get rid of speaker pop? 

Ensure the speaker wires are properly connected to both the speakers and stereo receiver. Turn off any nearby electronic devices that may be interfering with the speaker sound. Move the speaker wires away from any electrical cords. If the issue is still unresolved, reset the receiver to the factory default settings.