[quote name='bmulligan']just to clarify, theres a difference between regular stereo, surround, pro logic, pro logic 2, digital 5.1, etc. The OP was asking about surround sound.
Over plain old stereo, yes it's worth it. Any stereo can interpret basic 'surround' sound, or a third channel, you simply wire the speakers specially. Digital sound, like 5.1 or STS, etc. needs a specific receiver and source.
Does the PS2 even have 5.1 capability? I have an old model and it'll only do pro logic output. I thought Xbox weas the only gamesystem with 5.1 digital.[/quote]
I thought all three systems techincally had 5.1 support.. but only Xbox actually had true 5.1 in-game, PS2 and GCN are only music/menus/loading screens etc. I could be wrong though.