what is this 14.4v input ?

hey freakey and forbidden, thanks for your replies, um freaky forbidden is correct with the specs he gave. But forbidden, its says that the amp will run 800x1 at 2 ohm at 14.4, i dont think that means peak power, i.e say the amp gain is at half way with the car off, it gives you 200 watts or watever, if the car is on, it will give you 400 rite? Plz explain this further , because the specs say the amp will do 500 watts x1 at 2 ohm when input is 12.5V, when input is 14.4 V, the amp will do 800watts x1 at 2 ohm.

Wanted to know if u dont get 14.4 from your electrcial system, is there anyway to up that without a new battery or higher power altenator. And uping  the volatge in the rca line do anything like using a line driver?

In order for the amplifier to maintain a continous power output a number of things need to happen, things like a constant supply of power at 14.4v, not dipping down to 10 (your headlightts are on, air conditioning on etc), a good solid ground, no excessive heat buildup on the amplifier - an amp is designed to get warm, but at some point in time all that heat buildup is from driving the amp really hard. Some amplifiers have a thermal switch in them that when activated, roll back or govern the amount of power going out to the speakers, I am not sure if this amp is one of them. Now let's hope that your vehicle delivers more than 12 volts, the amp will definitely give you more power. I did not dive right on into the MTX website, but from what I did see some of you may be reading what the manufacturer wants you to read. The DYNAMIC power rating is 800 watts at 2 ohm at 14.4volts, The RMS power rating is 500 watts at 2 ohm at 12.5 volts. "Dynamic" can be viewed as peak, some manufacturers even claim an even higher "Thermal" power rating in watts. Dynamic and Peak are (basically for the sake of arguement) one of the same, it is what the amplifier can produce for a brief instant in time, not what the amplifier was designed and engineered to do on a continual basis. Keep your gain control turned down, this is what it was designed to do, if you turn it up sure you get more power, however the tradeoff you get is increased noise floor and mainly the prime way to destroy your speaker by clipping the amplifier, the sub won't distort on it's own, it only reproduces what it is given, if you clip your amp causing it to distort, Mr. Subwoofer is going to do his job until one day you need a new sub. As I stated before this is a great amplifier, I would still look for a bigger one, the worst thing in the world you can do to a sub is underpower it, especially if you are the type that plays your tunz loud and long.

I would add a capacitor to the system right away, as well a good line driver from Audio Control or a high voltage Eclipse cd player (CD 8443). See what people have to say before you make your decisions.