I have two cvr's and a jl 500/1 right, if I build A sealed box for them then they are like 150wrms below the rated rms of the subs and that means the further away it is from full excursion. But, If I build the vented then I am only 50wrms below rated rms power. So Anyone help me out on how to get the vent length and width because I want just one big vent in the middle of the box between the subs. I just dont get how I am supposed to know the width of the vent and how to know how long i need to cut out for the depth and such. Jus need some help over here