i have a lexus ls430 with the 11 speaker mark levinson system. i have a 15" brahma and a 1000/1 jl audio monoblock. i also have a 300/4 jl audio amp. but i am getting different people telling me not to put it in and people telling me it would be nice to add it. i'm looking for really loud really good sound quality and im not sure if i should hook up the 300/4. any ideas and reasons why i should or shouldn't hook up the 300/4?