The Bose Power Microphone with its high level output is electrically matched and plugs into the Mic Input Jack on the back of your Bose Acoustic Wave Music System CD-3000. Since the Bose Acoustic Wave Music System II does not have a Microphone In Jack, if you use the Microphone in the Aux In Jack it will only receive input to use the Microphone as a PA system without allowing CD or Radio Music at the same time.