What is that noise?
 

I had my amp and speakers installed by someone and they nor I can't figure out why my speakers pop when I start my ignition. After the initial start up the speakers play fine and there aren't any problems with the amps. I read somewhere that maybe I have a bad ground but before I go that route to fix it, I just wanted to get your thoughts on what may be causing this. It's a little embarrassing having my wife ask me what's that noise and I can't figure it out. The popping noise occurs at the 5 second mark.

Very common in some installs. Installing a relay will solve the issue on the remote wire. The problem is that the amp may turn on before the source unit. Just like plugging in a RCA to 3.5 headphone jack. Plug the rcas first then a phone or iPod to the headphone jack after the amp is on will cause noise. Didn't watch the vid. If using a aftermarket head unit use the remote out from it or install a relay to cause a slight delay which will fix the problem.