I really need to add some info. So this sub only need to play up to 45hz. Could be lower. I have two martin logen 12 inch subs that will handle upper range. I really just want this sub to hit 35hz and lower really trying to get that 17hz. But I know with my space it will be hard to do. I know now why I haven't ever built a isobaric box. So many things u have to know before u try.