Background noise/hum with microphone

[persist]

@Stef67

when I plug the microphone in one of two input (as mono), I noticed an annoying buzz or noise.

Inputting a mic will need a mic preamp - which one is best cheapest and portable?

One note, if you’re going to use the Rolls pre, keep in mind that it requires a shifting 9 V to 15 V adapter, this is because the phantom power requires more voltage I imagine. Keep this in mind if you are going to get it, it is not going to be so simple to power without its original adapter.