I honestly haven't spent any time tuning it. It sounds good to me, but I only use it under 60hz and I don't have a large enough room to move it around much, especially since its so large. It sounds better than my huge(12cuft) homebuilt sub which used an 18" woofer in a ported box, but thats what you'd expect for a professionally designed sub.
What is the best way to tune a sub? I was under the impression the radio shack meters weren't very accurate at low frequencies. Also, I don't have any real EQ, so I'm not sure what I could do to it.
-Ian