I have a new iMac intel 20". I can connect to my airport express router and have my printer & powered speakers connected to the airport express. I keep getting sound drop out on the speakers and even though the printer works, the drop-out is evidently occuring with it also because it takes too long to print a page. No 2.4ghz phones around or microwaves.

Any ideas? I'm not on a network or anything. Just me and my iMac and the speakers & printer. Bad firmware? software? or ignorant user?