How to get that sort of overloading bass bwoom sound?

[ballstix]

I don't really know how to explain it very well, but it's in something of Devin Townsend's and also on one of exzem's songs: http://www.soundclick.com/bands/page_songInfo.cfm?bandID=960121&songID=7671759

55 seconds in. What is that?

 

[Sweetnothing]

That's a subdrop driving the 2 bus compressor hard