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can't get mixer to work >_

so i just bought a brand new out of the box Alesis Multimix 8 usb power mixer and some brand new sure sm57 and 52beta mics (for recording drums). all in all i spent close to $900 on brand new equipment and when I plugin the 4 mics to the 4 mixer mic preamps and power it up and even switch on the phantom power, i get no responce or pickup indicators on the mixer.

Kind of buzz/noise issue with my Mixer & Mic preamp PSU

Hi all!

I just bought a micpreamp -PreSonus Tubepre- & I need to connect it on the same USA-EU transformer (they are US models connected on a European plug) of the one which is used to connect a Mackie VLZ 1202.

it makes a kind of buzz/noise which is more than annoying for my voice recordings.

Any ideas to solve this?

Thanks for your answers!