Hi people, first post here and I'm building my first system. I will be running an Orion XTR-2500.1Dz amp powering an HCCA 12" black coil sub. I've currently got a 150a alternator on the stock electrical in my Mk7 transit sport. My question is what alternator/battery combo will I need. The amp is rated at 2500w RMS @1Ω though it has been bench tested here : https://youtu.be/DMBV0dVAtUo at 6744w Rms (I don't know wether to believe that or not). Can anybody help me make the calculations. Thanks, Gaz.