sundown sa12 with round port

[UnIbOnGeR]

im currently throwin 2 sundown sa-12`s in my boat separate enclosure for each woofer runnin off a cendo 2000 watter the subs are ggonna go under the back seat I wanna go ported tuned to about 34hz sundown sais 2.0 cu ft my guy is sayin 2.5....... ill listen to ur recommendation now my issue is since it is a boat id rather do round port port ( woofer and port firing forward) as opposed to slotted but the box wouldn't be big enough to accomadate a round? or need multiples? im lost if someone could throw me up a design id appreciate it straight square box no wedges or anything

[4bannger]

Max sizes would be helpful.

[Joe X]

3 4" round ports flared will work ok.