Rhino, I recommend the 5 port over the 7. Because the 5 has more bottum end power. I just put 1 in my Cen matrix arena FRE and I m still breaking it in and can tell already the power is there. I had it on the rack today just practicing and I am still very rich, I havent had it up to 200 deg yet and it was doing well. You just have to be patient breaking it in.