i used to have an amp just like that an it always got hot an then i sold it to a good buddy of mine an he put 2 q power 15's on it an it would get so hot it would blister your hand if you touch it an a full can of pop roled on to it an he did not know an it blew up and sprayed every were. i would prolly say its normal for it an if you have it some were were the heat is trap and it cant get air that could be part of it to