ummm... NO ^^^^ making the subs hit the hardest will not void the warrenty. thats like saying going fast in a race car will make you lose your license. If you run the subs at proper CLEAN power and the signal isn't clipped and your not trying to get more out of the subs than whats really capable of the setup you have. For sq and spl i suggest a slot ported box. Depending on your size tuning and power will decide exactly how you want it to sound. So I suggest that you take those 2 10's put them in about 3 cubes maybe 3.2 cubes. tune it to about 38 htz and put about 400 rms to the pair. so 200 a sub. that should give you a good sql setup. loud low clear clean. and potent. As for the amp for that kind of power you really have a lot of options. I would run the hifonics 600 watt amp. at 2 ohms you will be sitting alright. and you will get decent power out of the amp. I wouldn't over power those subs. I had an infinity ref. 10. sounded great in a sealed box. I got a buddy with those two same 10's and his system is very tight and accurate and decently loud up high but bottom end there is nothing. I ported the 2 in 3 cubes even and he was shocked that it sounded still so clean but so deep.