The wattage rating on this description is wrong. This amp does 600w in 2 ohms, not 1000w.
I had the JX500 before this amp. The output difference between the two is only 100w, so theoretically you shouldn't be able to hear much difference, but you can. You can feel and hear the difference. If you're heart is set on a JL amp and you can afford the jump in price, the XD line are nice amps.