I bought a used Sundown 1500D off of Skrilla22, and he did a great job shipping, and the amp is in great shape, it just has different internals, RCA's, and fuses, and I was wondering why. Instead of white RCA backings, they are blue, and I cant exactly describe the internals untill I get home and looks some more, but they were definitley different than my other sundown 1500d. I'm just curious on why its so different than my other, could it be a real real old model of the sundown1500d? Thanks.