I my box ported to 30hz, I cannot hear(feel) a 20hz test tone very much at all.
I would say severe drop off below tuning is a negative. But maybe I'm doing it wrong //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif
i was sealed with my t1s...it was loud..but when i went ported it was like day and night...ported way louder...but my ported box sucks for rock music...sounds sloppy..juss my 2 cents