this is from the rockford sub book.advantages of sealed enclosures.small enclosures,linear flat response,no port noise,higher power handling at all frequnceies,excellent for sound quality.advantages of vented enclosures.higher average output than sealed,tuning frequency can easily be adjusted by changing port length,deep bass response with lower power requirements,great for high output with limited power.i have 2 punch he 12s and built a sealed enclosure to rockford specs with an older punch 120 it hits pretty good.i would check out rockford fosgate.com for laughs check out that 20,000 watt amp for 19,999 dollars that otta blow the deck lid off your shit ha,ha,if you get some rockford subs i have all the box sizes depth width and all that jazz for sealed or vented for the he from 6.5 inch to 15 inch subs