I personally do not have any clue on how to setup a nice speaker system. I want to do something similar to this http://www.hhrclub.org/galleries/hhr...epts/index.php. I want to do the Earthquake ShockWave system setup. I am looking at picture 3 at the bottom. However, instead of the 12'' i may want a 15'' sub attached to the underside of the enclosure/floor. Then instead of the 6.5'' woofers i want to replace those with VTEK-52's in the same locations. My question is: Can I use the Mono Block D amp they say in the article with a 15'', then what amp would i need with speakers, finally is it possible to connect this all to the factory HU. I have the upgraded audio system and Onstar. It would be much appreciated if someone can help me here. I don't have any idea what is what, and i am not installing it on my own, but i would like to have my bearings straight before I do anything.
Thanks
P.S. in Picture 3 at the bottom, what is that on the right hand side near the liftgate. An Equalizer?