I'm trying to figure out the same thing. I'm looking to purchase some new speakers as well but I dont know where to look. I'm not tech savvy and I dont know much about speakers and subwoofers. I was told by someone that if you were to look for speakers for the gx470 class they need to be 8 ohm speakers. Anything less will not work out in the long run. Let me know if you figure anything out. Thanks.