Car audio systems have always been a joke, they claim 1000W of output power, IF it was driving this much power your average car battery would only last 20 minutes when the engine is off. You would just about be able to listen to a single track if you had the 3kW version.
Nearly very manufacturer I have ever seen quotes "music power", which is some weird mess up way of calculation power that is not even standardised, so every manufacturer makes up their own way. The system might be rated to 1000W, but it will certianly not deliver.
One of the spec I've seen before was the rated power being the power disipation that would not heat up the componants to failure. "Marketing folk" often make up figures because they think they know how to. Some even claim they are Class-A devices without even knowing what that means. Class-A is a stupid setup to have on a battery operated system anyway, Class-AB is not much better either, a high quality Class-B or Class-C device would be a better product.
The 1 Farad caps the "boom-boom kids" use do improve the performance a little but pound for pound they are worthless. Costing sometimes over £100, they are a joke considering how badly they are made.
The worst thing about car amps is that they are crap. Unless you spend a packet on the speakers as well as the amp, they distort before they get to within even a quater of their "REAL" rated power output. I supose it does not really matter when it is that loud, and the content is not really that good! :lol: