It would be seemingly advantageous to have a large pole vent so that velocity would be lower producing less turbulence noise. I may have misunderstood you though. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif
I have a beautiful 12" that is not super deep and sounds incredible, goes deep and gets quite loud. It's currently priced at $150 plus shipping but if you want to pay for $20 gas and mileage I could meet you somewhere along I-90. I'm in the Madison area. Pics on the first and fifth page. PM me if you like it.
http://www.caraudio.com/forum/showthread.php?t=407517