famous beagle
Well-known member
So I got a Presonus MP20 off ebay. It arrived a week ago or so, I hooked up a mic and tested both channels. Worked like a charm.
Yesterday, I racked it up and tried out the direct instrument input for a bit, and it worked great too.
Then tonight, I was going to quickly test an SM58 before I sell it to make sure it's in good working order. I hook it up, and all goes haywire. I got no level reading until the gain was about 85% up, and then it practically flatlined to the red. I tried different mic cables, different mics, etc. and got the same thing. Then I unplugged the input mic cable altogether and am still getting the same thing.
At first, it was happening only on channel 1, and channel 2 seemed to be ok. But after a few seconds, ch 2 started doing the same thing. And now they're both acting the same way.
When I plug a guitar into the DI input of either channel, it works as normal. But the minute I unplug that, it goes back to the problem on CH1. CH2, however, seems to be "fixed" for a bit, but then, after a minute or so, it starts doing it again as well. This is the case whether a mic cable is plugged into the input or not.
I've attached a sample of the noise that occurs when the meters go haywire. (Don't worry; it's not loud at all.)
Does anyone have any clue as to what could be going on?
Thanks for any help in advance!
Yesterday, I racked it up and tried out the direct instrument input for a bit, and it worked great too.
Then tonight, I was going to quickly test an SM58 before I sell it to make sure it's in good working order. I hook it up, and all goes haywire. I got no level reading until the gain was about 85% up, and then it practically flatlined to the red. I tried different mic cables, different mics, etc. and got the same thing. Then I unplugged the input mic cable altogether and am still getting the same thing.
At first, it was happening only on channel 1, and channel 2 seemed to be ok. But after a few seconds, ch 2 started doing the same thing. And now they're both acting the same way.
When I plug a guitar into the DI input of either channel, it works as normal. But the minute I unplug that, it goes back to the problem on CH1. CH2, however, seems to be "fixed" for a bit, but then, after a minute or so, it starts doing it again as well. This is the case whether a mic cable is plugged into the input or not.
I've attached a sample of the noise that occurs when the meters go haywire. (Don't worry; it's not loud at all.)
Does anyone have any clue as to what could be going on?
Thanks for any help in advance!