even though the deck says it will produce 60x4 in almost every single case will not produce the 60x4. From what i know it would produce somewhere like 23-27 watts. 60x4 mean that the deck can push it for maybe a half second where it doesn't even do anything. if i was u i would get the amp. i will sound much better.
im not sure what u are refering to when u say internal mounting circuit.