kozikowski wrote:This is one of the systems least likely to have noise problems like this. Usually, someone buys a cheapo USB adapter and it has trouble with the computer and starts making noises. That's not how yours works.
The Presonus is USB Bus-powered...
And no way to test with an external power supply. So the only thing to exclude the USB Bus-power problem, is by testing on another computer, preferably one that's known to work well with USB Bus-powered audio.
But my money is on a problem with the phantom power. The NT1a is fairly power hungry. The Blue Snowball is not. It's an electret, I think.