More hum/buzz/60hz noise.

[Steenamaroo]

Cheers. I'll post back tomorrow.

[moresound]

While driving home Sunday night I was trying to pick up the Superbowl on AM radio - Every time I went by a factory or a parking lot with a lot of street lights I would get an interference and I could tell when I passed a so called bad transformer up on the pole. What a racket!

So that's your problem right there Paul. You are the proud father of an AM radio.

[moresound]

Paul have you tried using a 3 foot XLR cable to connect those dynamic microphone to see if that helps with the hum?

[Steenamaroo]

Paul have you tried using a 3 foot XLR cable to connect those dynamic microphone to see if that helps with the hum?

No, but I have plugged microphones directly into the preamp. Some of those EV mics have a slim enough base that it goes straight into the XLR socket. (Top tip for a handy talkback mic right there!)

If anything that was worse. Having the mic anywhere near the gear (computer/screens/preamps/interface) just introduces stronger buzz.

[moresound]

So strange. Get the chicken wire out a build that Faraday cage!

[talktofrank]

having the same problem, i can hear my power supply humming with my own ears, needs to be replaced

[Steenamaroo]

That's a different problem then. I don't hear mechanical noise in the room.
Kinda like when your phone noise comes through your hifi.

Are you using a motu 828? Some of them have problems with buzzing noise (audible in the room). I've read about people remounting the transformers with rubber bushes or something like that. Worth a google anyway.

[dgatwood]

Your gain is almost invariably higher for dynamic mics than for condensers, which could be the reason you're hearing hum only from the dynamic mics.

Try using the power supply with your laptop so that your analog ground isn't floating. See if that fixes the problem.