Rep Power: 432

alright i just got rockford fosgate 150s amp .. but this thing came with amp.. i dont know what it is. seems like fuse.. i didnt need that to hook up subs ,,,,
anyone have idea what that is?



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Rep Power: 0

Looks like an inline fuse for the amp power wire. You need to cut the loop, and then place that fuse holder between the battery and amp.

 
Rep Power: 318

yep, it's a fuse holder. That's how they come when they are new. Judging by those pictures, you already have an inline fuse holder (last pic, upper right corner), so you don't need to put this one in.

edit: Try turning the sub box around so the subs point at the rear of the car, it might sound better.