buy an av receiver or amplier witch acepte DLP2 ( dolby proligic 2 ) with 5 speaker and a subwoofer , prefer Denon , Matranz , Harman kardon or yamaha
amplifier and for the speaker you buy all what you whant but INFINY , JBL , BOSE and other are better buch cheapest
an av amplifier with 5 speaker or 6 , and a subwoofer cost 600 euros a least = 600 $, don't buy thx certified or 7.1 amplifier they are very cheap
an amplifier 5*50w or 6*50w is good for home using . I have a yamaha av receiver RX-V530 5*60wath with infinity speaker and one subwoofer
don't buy poor speaker , or bad av receiver
on gamecube there is only 10 or 20 games who have DPL2 sound and only a little who have a very good suround sound effect like eternal derkness , starwars
turok evolution.