I know you love the super low stuff, you had also mentioned that they sound good for music too?
I know these hit no where near <20Hz but they are still some super nice bass tones.
I use these and my subs rattle things on the other side of the house, I can't even begin to imagine what yours would do.
(This is a pretty wide mix of stuff, you might not like some or any of it.)
Oh and, NSFW!
Lil Wayne - Lollipophttp://www.youtube.com/watch?v=GODqk-XLVjg&hd=1
at 1:22 during the line "and make that thing chirp, chirp" It gets pretty low, upper 40's I think. (which on my system is really fun)
Ludacris - How Lowhttp://www.youtube.com/watch?v=1Bb3lFWh8gE&hd=1
This was my favorite demo song for music for quite a while, the entire front of my house flexes.
Joker - Snake Eater (Dubstep mix)http://www.youtube.com/watch?v=AryVK9vtX3M&hd=1
(this has wonderful mid low bass throughout, for people who come to listen to my system who have no idea what infrasonics are, I start them with this, then move onto things like WoTW)
(this is stuff that is a bit different)
Bjork - Hyper balladhttp://www.youtube.com/watch?v=NCcPF2wJUzU&hd=1
This song is what started my bass obsession, over a decade ago.
It's not super low, but it is really big, rich and clean.
Mum - Finally we are no onehttp://www.youtube.com/watch?v=56_AsRECKeA
This tips the charts on what most people consider to be experimental, though I highly enjoy this artist, and album.
I was listening to it the other day and this song came on and my entire room started to move.
I tossed it into Cubase and ran a quick Freq analyzer and found that in the recording there is NO High Pass at all. There are recorded noises (quiet ones) that go into the single digits. Most of it is in the first 30-60 seconds.
I would love to see if this is just noise, or if it comes out as super ultra low stuff.
I have plenty more of really fun bass stuff if you want, though most of it is music in the 20-80Hz range.