You're not planning on powering two 10w7's with a 500/5 are you?
That amp is only 250w on the sub channel, nowhere near enough for two 10w7's...maybe, just maybe it would be enough for one.
I have the same amp and love it, but I'm only running one 8w7...for me its plenty of bass in this car. I guess I'm just getting old and care to blow out my ears anymore...I've been installing for a living, been doing it for 10+ years now.
I don't care to add the weight to the car making it slower and loosing truck space either...I'm more about good sound and going fast!
But if you really want to add all that sub bass, using two 10w7's will do it for SURE...but your going to need at the very least a 500/1 for just the subs.