Another good rule of thumb is you want approximatly twice the amount of power for subs as what your sattelites are pushing. In other words, if your component speakers or door and dash speakers are pushing 500 watts total, then 1000 is what you want for your subs.
4OHM subwoofers give excellent tight response and will give you better defined bass. 2 or 1ohm setups, though they allow higher power output with the same equipment, will have very muddy bass. If all you care about is boomy bass with no definition and the amp can handle it, then 2ohm is good. Otherwise for distinct bass you need a 4ohm hookup. Keep in mind at 2 or 1 ohm, your amp will be roasting, be sure to give it plenty of air!
The lower the ohm the harder the subs will hit, most subs are 8 and 4 ohm. Some subs come in 2 and can be bridged to 1 ohm which gives the best power. But I say that you got a pretty good setup, go with a amp thats at least 1000 watts and it should be good
Wait, so you guys are saying this stuff isnt true? //content.invisioncic.com/y282845/emoticons/crying.gif.ec0ebefe590df0251476573bc49e46d8.gif//content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif