Dubstep is what we called "techno" in the very early '90s.
Go look up singles from Enigma and The Shamen, kids.
If rap's your thing and you want some serious bass, go find some M.C.A.D.E. Not the best rap out there, but the bass is solid. Don't bother with headphones -- you won't hear the bass. Get yourself some old fashioned amps and subs.
You think dubstep invented electronic bass? C'mon, son, we'll go dig out some of my vinyl techno singles from the '80s. Ain't nuthin' new under the sun.