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MXL 770 quiet and loud hissing

Hi!
My MXL 770 is very low volume and there is a noticeable hiss.
I haven't used it in a while and the last time it was on a different computer and it worked fine.
I use a Neewer 48V 1-channel phantom power supply.
I am not very experienced in troubleshooting this kinda stuff so if anyone could help me thatd be great!

Deciding what way to troubleshoot background hiss or grounding problem...

So, I have been working over the past couple of years intermittently trying to record both my guitar, and lately my voice, using my laptop and audio interfaces. I have always run into the same problem: background hiss and white noise.

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