[Mike P.]

Are the subs DVC 2 ohm?

 

[Mike P.]

If the parameters are accurate then they do quite well. Shown is 2 of the subs in 12 cu.ft tuned to 20 hz fed by an EP2500 with a hi pass filter at 18 hz. A 8" diameter round port 22" long would deal with the port air speed. 2 of these subs would be impressive.

 

[Mike P.]

A lot of people use sonotube for large round ports as it's cheap. Slots work just as well.