can i hook up a 1200 watt car amplifier to a 10 amp power supply?
First of all it is going to take a poorly built box, not to the manufacture's specifications to make a kappa perfect sound bad. If you want it to be loud and sound good a slot ported box does a very good job. 10 amps is not enough power for a High quality 1200 watt amplifier. Example, sony amps are not that great and a very inefficient, so at 1100 watts peak for the xp500 (if it can reach that) draws 90 amps of power. Look into JL amps and if you cannot afford one i would reccomend Power Acoustik. Power acoustik makes very low cost equipment that is not bad for the price.