Growing noice with phantom microphone

Posted: Mon Jun 29, 2009 12:08 pm

Hello everyone,

I would very much appreciate anyones help!
I have the following problem:

When activating the recording in Logic, there slowly grows a noise that is not there in the beginning but get's worse and worse after approx. 20 sec. until finally everything that comes through the microphone is distorted.

I use a USB audiointerface and a little pre-amp. the microphone is a phantom powered one but the same happens with standard microphones.
It used to work fine with other microphones when I tried it a couple of months ago.

Plugging of the power cable from my macbook doesn't change anything.
I have to restart logic to get rid of the noise but of cours it starts again after 20 sec....

Any ideas anyone?

Thanks,
Tom

Posted: Mon Jun 29, 2009 12:12 pm

Feedback, turn down your monitors or use headphones.

Posted: Mon Jun 29, 2009 5:07 pm

What interface is it?

What is the noise like - screechy, buzzing, rumble... pick an adjective.

I doubt it's feedback.

Posted: Mon Jun 29, 2009 9:50 pm

Reads like a monitoring issue, a select box or button in the software OR the soundcard interface to allow for, ah, monitoring.

Posted: Mon Jun 29, 2009 9:57 pm

Try setting your buffer larger under audio in the preferences tab.

Maybe that will help?

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