I have a single SA-12 D2 on the v.1 1500D. It was fine on 1 ohm with stock alternator and a 88A battery in front. 1/0 gauge all around. I say was, because I've added a secondary battery in the back, right next to the amp, and now it's even better. I say go ahead and purchase 1/0 gauge. Eventually you may run 1 ohm or even a bigger system. You will have to upgrade the wire and that means more money spend and more time to take apart the car to run wires again. Do it once, properly. i was thinking about getting a volt meter for that reason. Is that a good idea or a waist of time? In my opinion it is, you never know what may happen and your equipment may see low voltage and get damaged. You don't need 1/0 for the big 3, the wires are relatively short and can be thinner but still pass a lot of current. i was thinking about getting a volt meter for that reason. Is that a good idea or a waist of time? volt meter for what? well a lot of people hook them up to THE amp so they no for sure the volts arnt dropping Volt meters should be connected to the battery with a fused lead and chassis ground. They are a waste of time and money unless you are running large amounts of power IMO. Let me tell you something that happened to me several days ago. I added a secondary battery in the back. Everything was good, it was getting charged and so on. After some day my sub was making terrible noises at high levels, like it was blown. I was already looking at re-cones. Took the sub out of the box, played it on my home amp, everything was fine. I go to check the voltage while playing in the car. It was dropping below 9 volts and not even at max volume. You can't tell me a volt meter is useless to monitor what the hell is going on with your equipment. Anything can fail. My amp may have been seeing below 8 volts, clipping the shit out of the sub. In the end it was a bad fuse, replaced and everything is fine. With a voltmeter, connected to the amp, not the front battery cause it would have shown normal voltage, I would have noticed right away.
