ummmm.... wow. You are going to need to give a little more information. Are you running a Car PC? when you said "I want add a sub which has a build-in amp" the only subs that come with a built in amp that i know of are sold by Bazooka. what do you mean by connect the audio system to your Ipod. "system pannel"?? mount what thing??? I think if you think out what you're going to post first instead of just posting garbage, things would go 10x smoother for you.