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Puscifer - D is for Dubby. I honestly thought that listening to it had broken my earphones.
It certainly may not be the deepest bass ever, but it is deep and powerful on Aaron Copeland's Rodeo. A really fun piece if you haven't heard it. Check it out.
The issue is that there are a lot of songs that dip stupidly low, but they go beneath both the range of most speakers and the range of human hearing.
In hip hop, Celph Titled's "So Cold" and Wiz Khalifa's "On My Level" both do this, and they both sound like garbage as a result. The sweet spot is around 30-35, that's where you'll get the hardest and most teeth-rattling bass.
If you have good subs or good headphones, honestly one of the best is from ol' Gucci Mane:
This is one of my favourites and the only one i know that goes that low and with such power
Three Ralph's by Dj Shadow drops
Kode9 - Halo Dub
A track optimized for sub-bass testing by SUBPAC. Extremely powerful and omnipresent <30hz subbass with interspersed cut-and-paste female vocals along with fairly minimal synths for mids. The sub-bass at 2:09-2:20 stands on its own and goes deepest and most powerfully, not that the rest of the track doesn't.
http://feel.subpac.com/creator/kode9/ (make sure to download the full-bitrate mp3 rather than listening on soundcloud)