Absolutely!! If you turn up the gain too much, the speakers will smoke.
You can use it at a lower level
No, the output of a 350 watt amplifier will not destroy a 500 watt capacity speaker.
Yes, if the impedance matches.
Depends on what your willing to spend.. For two 1200 watt subs I would go with a 1200 watt amp and run both of then 600 watts ( you don't want to always run subs to full power, because the voice coil might blow or you will light your subs on fire). If your feeling brave you can run a 2000 watt amp 0_o that will annoy your neighbours, but make your car bump!
Yes the amp can push the 2 subs. I have 2 1250 watt 12inch subs and 1 maybe 400 or 500 watt amp and the amp does fine but if you want more bass at lower levels of volume then you want to have a bigger amp. Just make sure your amp doesnt blow your subs.
4 gauge
You could go with a 600 watt 2 ch amp or a 300 watt mono block amp, depends on what OHM the subs are, if they are 8 ohm you could wire them down to 4 ohm or if they 4 ohm u could wire them to 2 ohm, i have a 600.1 Boss amp and subs are wired together at 2 ohm and they BANG.
yes
Not if subs are rated for 2000 watts each.
YES! it won't reach it's peak, but that's also probably a good thing, cause it'll be harder to blow your sub. i prefer to buy either the exact watt match for my subs and amp, or buy the next lower watt amp from my subs
no you wont get a 5000 watt amp and u will be fine
They can be as loud, as the amp is not delivering 600 watts. The 10" sub rated at 600 watts is able to withstand more power.
I have 2 q power 1500 watt subs and a 3500 watt proacoustic amp and it pushes it well although not enough so im sure you need more than 2000 watt to push 3 of them.
no you can't. if you want to run separate amps for your subs they both have to be the same amperage and preferably same model. you can use the 1000 w amp on the subs and get a nice amount of bass depending on what size and model subs you have. then just use the 400 w amp for your mids and run the highs off the radio lines. try that and you will hear some good sounds. you will also need a crossover as well. hope that helped.
it depends on alot, alot of things. but id say to be safe a 2000 watt. but the best amp would be a sundown saz1500d