I just popped it in. I have a Shiva III ported sub in an 85l enclosure.
The bass is most definately there. There's a hard, low rumble. It's more feel than sound. I'm only driving it with the 165 watts from my 7100, so I'm sure it should be even more impressive.
It could be like you said, your sealed sub is rolling off down there. My ported sub is tuned to about 21hz, and is -3db down in the teens.
If you're in the NJ area, you can swing by and have a listen. Just bring a good amp
Remember the Intellivision?http://www.gotmaille.com/nostalgia/