One of the staples of Drum ’n’ Bass is stacking multiple oscillator waves (sine, triangle, saw or square) together and EQing/compressing each part separately, then overdriving them on a mixing desk.
The result is then resampled (preferably using an E-MU or Akai hardware sampler) and processed using flanging, chorus and detuning. Repeat the process for a killer D’n’B bass.
Using overdriven sine or triangle waves with a medium filter attack and decay also gives an evil swoop to the start of the sound. Also, why not try 808 kicks pitched down (to lengthen them) which can also work great to get that famous deep sub sound?
Hear it on: Photek - The Rain; LTJ Bukem - Watercolours and Coolin Out.