What's a good brand for a 4000 watt amp or a 2400 watt amp?

punch Bd 4000

audiobahn has a real good 2200 watt amp i think its called a flameQ distortion level is kinda high but pumps a lot of power might wanna invest in a lot of batteries :)

kicker zx2500.1 amp good amp

Whatever amp you chose be sure its a good brand what you pay is what you get the name brands also seem to last longer for some reason. Kicker always has really good amps but pricey. The best thing to do is call the co that you bought the speakers from and buy the amp they made fro them and the enclosure they made for them to get the best sound it isn't all ways the cheapest but its the best. In my opinion anyway.

If your total system power is a 1000 watts RMS or more you will need to: 1. Upgrade the alternator to a high output alternator 2. Upgrade to a heavy duty deep cycle battery 3. Upgrade the "Big 3" - that is to replace the power wire between the battery and alternator, the ground from the battery to the chassis and the ground strap from the engine/tranny to the chassis with at least 1/0 AWG wire. Failure to do this will result in you replacing them anyway as the alternator will eventually fail. Here is a guide that will calculate what size alternator and power wires you need as well how to set the gain http://www.datafilehost.com/download.php?file=6d26c621 You'll need Microsft Excel to use it. See my site for more info http://spkrbox1.spaces.live.com

Audiobahn. I've ran a lot of car audio and always impressed with Audiobahn. I have 'em in my car.