stereo upgrade

So I already have the BA sound package in my caliber but I want more bass. I'd like to add a sub... I've read that the BA already has a an amp... Would I be able to connect the sub through that already existing amp of would I need a new one? Also does the stock head unit come with a port to hook...

I've installed a amp and sub with my factory head unit. Anyone know the best place to connect the amp remote wire so that will shut off the amp when the stereo is turned off? I have it connected to the fuse box under the hood and will turn off when the car is off but want to control on/off of...

Alright Ill be documenting my build here. The HU will be an Eclipse CD7000 with the GPS105 and IPC106 addons. The GPS105 gives the HU area shot GPS capabilities and will display it right on the screen with the push of a button. The IPC106 is my iPod interface adapter that will allow me to...