I'd like to buy an Airport Express to stream music to a set of speakers away from my computer. I already have an Airport Extreme N that I use as a base station. I'd like to buy the old Airport Express a/b/g to use solely for streaming audio--I can get it much cheaper than the new Airport Express a/b/g/n. My concern: I don't want the Airport Express G to extend my existing network, which is broadcasting N. In other words, I don't want my network slowed down by the Express G. Can I turn off the network-extending capabilities of the Express G to avoid this happening? Are there other ways to avoid this slow down? Thanks!