Well, I'm gonna order the stuff for a 2nd and identical 3rd sub today. One for a friend and one for my parents. Gonna be a Dayton 12" DVC in a 122.5L enclosure tuned to 20hz with a full length FP4 port kit powered by the 160W PE plate amp modded to 1dB boost at 25hz. I'm gonna use the remaining 6' of 18" sonotube I have left from building mine. So for 122.5L, they are going to be around 38-39" tall with base plate and legs. The port is going to be centered on the top endcap and as such in prime position for something to fall into it. So I plan on covering it with a metal mesh grille. Question is, will there be any real difference bewteen the sizes? I was thinking of this 8" one: http://www.partsexpress.com/pe/showd...=5755&CATID=48 Will there be any significant air flow difference between the 8" and the 10" or 12" equivalent?