Huh //content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gifnot quite sure who makes red x's.
i've heard some people complain about tuning the xxx that high. Go to http://www.termpro.com and do a search and you'll see what i mean. I guess it just doesn't sound very good like that. Most subs can be tuned that high without it sounding really bad, but i"v heard the xxx does though.
I'm just saying what I've heard, I never tried tuning it higher than 26hz so I don't know from personal experience. Maybe it does sound okay, i don't know I cannot imagine anything tuned to 38hz sounding really good though. For a large subwoofer at least. But the xxx DOES have a crazy ass low end so maybe it does level it out so the low end is not exadurated. Because I know I had to eq the **** out of mine to get rid of the RIDICULOUSLY bloated low end, so maybe the answer to getting better sound and better SPL out of the xxx is to tune high i dunno. I'm not really a fan of porting mid-high to high QTS subs though.Strange. I tried my XXX15" in 3.8net, 39sq" of port, tuned to 38hz and it sounded very good and got quite loud. That was with "only" 700w.