stupid question here, I was looking at getting a couple of JL audio 10" subwoofers. i was looking at the v6 and v7 series. I think i am going to go with the v6 series but is there a significant difference in sound between the 2?. would a 500 watt amp be sufficient or should i get a 1000 watt. new to doing this my self so any help would be great.