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The Skar Audio RP 1500.1D 1500W RMS amp which has been tested to do rated power requires a 120A fuse. So your amp simply does not do rated power at all just looking at the fuse it uses. And the fact that your 60A fuse in the power line never blows just gives you an idea how little power you are actually running looking at the math Power = 120A x 13V = 1560W or just above the power rating. For 60A fuse: Power = 60A x 13V = 780W which never blows so you not even that (you don't even need electrical upgrades at this power). Factoring in amplifier efficiency at 60A you would be delivering about 300W to each driver but again not even that. I am going to guess you are actually delivering 200W to each 1250W driver or barely moving. If you are comfortable at that level you could just leave it like that but what needs to be done to get those subs moving is a new amp and an electrical to match, a cheap amp that does 2500W RMS is the D4S JP23 1.5 which is 299 and is ideal for systems with light electrical upgrades.

How much power are you looking for? Look up CT Sounds. They typically have sales/discounts running and amps are proven to do rated power as well as being great value.