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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!
I put an audio clip so you can see what I mean.(gotta crank the volume)
 

Attached files

101714af-8aed-4076-8b9b-e84d26ead757.mp3 (158.1 KB) 

Comments

bmow23 Wed, 03/17/2021 - 16:10

Boswell, post: 468219, member: 29034 wrote:
Is it the Neewer NW-100 phantom power unit? If so, check that you are feeding it with a mains transformer that delivers 18V AC. It's the AC that is the important bit.

Mine doesn't output that so i think this will be the problem. Mine says DC 13.8V 8W. I found one on amazon that says 18V2A. Should that be good? Thanks btw

Boswell Thu, 03/18/2021 - 00:20

I can only speak for the NW-100 model, as that is the one I have. That model needs 18V AC, since it uses a simple voltage-tripler rectifier to produce 48V DC.

The 18V AC mains adaptor that mine came with is made by Yee-Hu, an unknown name from the Wild East.

Boswell Thu, 03/18/2021 - 04:54

ronmac, post: 468225, member: 24337 wrote:
Are you able to try it with a mixer or interface to see if it is indeed an external phantom supply problem?

If his Neewer PP supply really is the NW-100 model, or is any other type that uses the voltage-multiplier method of generating the PP voltage, there is no point in doing further investigations until the mains power unit is changed to one that delivers 18VAC.

bmow23 Fri, 03/19/2021 - 15:22

Boswell, post: 468226, member: 29034 wrote:
If his Neewer PP supply really is the NW-100 model, or is any other type that uses the voltage-multiplier method of generating the PP voltage, there is no point in doing further investigations until the mains power unit is changed to one that delivers 18VAC.

Got the 18v AC today and that was the problem! Thank you so much!