Silverchair has a distinct sound when they get heavy in their non-frogstomp music. Its very bassy. In the song bridge of the song "untitled" and the chorus of "Spawn again" they have a really heavy sound. Does anyone know what he is doing to the guitars and bass effects wise and/or is he mixing it that way to make it sound so heavy?
Link to untitled --> http://www.youtube.com/watch?v=BllWHwgl78M
LInk to spawn again --> http://www.youtube.com/watch?v=IhzSxNWNPQY&feature=related

I've heard he uses a micro synth for the distinct heavy distortion. Is the bass using a microsynth? Do microsynths even make a sound like that? Is it just the bass or just the guitar?

I ask because Im looking into buying one if it is, I want to tap into that element of distortion that johns has. It really gets the point across.
If anyone has any answers at all to my broad question thanks in advance.