On Oct 20, 2004, at 8:43 AM, LENJOY at aol.com wrote: > I have have a M-Audio nova microphone and use a M-Audio USA > Bus-powered preamp and audio interface, but I still seem to get a lot > of background noise. It sounds similar to using the powerbooks > internal mic. Describe the noise. From the room? Hiss/white noise? Rumble? Are you trying to deliver 48 volt phantom power via USB bus power? IOW, is the preamp running off external power? j