Whats wrong with the fact that a shop build this? i work there and me my dad and the guy i worked with did this and yes i do know how audio works im not a dumbass like most people and sorry bout the comment wasnt thinkin when i posted it but i meant to add to it sayin i have a precision power bass level control on my amps and i do have pics of my build just have to switch it over to my laptop and i will uplaod them