Not sure why this started happening but when I turn off the car, the subs pop.

I did some research and this seems to be common. The solution is to add a delay to the remote turn on wire.

I have my RTW going from the deck to the amp and cap at the same time.

Got the diagram for the circuit but don't feel like building it so has anyone had experience with the PAC TR-4 delay box? Are there any alternatives to this?

It's $9 bux at
http://www.cybergiftcenter.com...=TR-4

 

Nobody is using this?

 

Very easy, as it is a simple relay. Hook power ground, and 12v switched. THats it. Install in behind your deck.