Reply to Sub Focus Bassline

Sorry if this has already been posted but I haven't been able to find anything on it.
Anyways, I was wondering if anyone knows how to go about making or at least start making the Sub Focus type bass.

An example of what I'm talking about is in his Ghosts N Stuff remix, around 1:07.



Its less obvious but still there in Rock It, around 1:50



I've been trying to get the sound using Massive and Sylenth1, but so far I haven't even been close.
If anyone has any idea on this please let me know!
Thanks!