Hello,

I'm running Ubuntu Studio (just upgraded to 14.10) with a Presonus AudioBox 2x2 USB audio interface. For Christmas I got myself a new MXL 990s condenser mic (60% off, sweet!), but when I plug it in and turn on phantom power, whatever app I have recording (Audacity or Ardour) suddenly has a heart attack; scrolling slows way down, and most samples are simply dropped, resulting in a very distorted recording.
When I turn off the phantom power, recording returns to normal and the mic continues to pick up sound for about a minute. Non-phantom powered mics (such as the trusty SM-58) have no issues.
Could the interface be jacked, sending spurious signals when phantom power is turned on? I ignorantly ran line-level signals through it a couple of times (not realizing you're not supposed to do that with this interface). Or could the mic be the issue? I have no other condenser mics to test with, nor do I have another working audio interface. Anything else I can do to troubleshoot?

Any help will be apprecited.

I didn't find the right solution from the Internet.

References:
https://arstechnica.com/civis/viewtopic … ;t=1265179
Creative Video Productions

Thank you.