Got it in. Its pretty loud. Its louder than my car from 35hz and up, granted its a smaller car. They are temporarily being ran by a Banda 7k. Im impressed with these subs. Sound pretty good and get really loud, don't play the lowest though but that may be box related. We were limited in space. He will get metered this weekend. I will post the results.
2 Zv.3 15's
2.87:1 4th Order @ 48hz