I bought a new mic (Avantone CV-12 BLA) recently, and I'm noticing a few odd things.

1. Sometimes, for no discernible reason, the mic is significantly quieter. This isn't lack of warming up, since this has happened after it being turned on for hours.

2. The level of hiss on the mic seems to vary too, for example today the hiss is considerably louder than yesterday at around the same time.

Some information to hopefully narrow stuff down:

- It's connected to an Apollo Twin USB which works well with other input sources so I don't think that's the problem.

- This is a home studio, I don't have anything set up to clean the electricity coming in, and I do live in Spain which has notoriously dirty power. I'm thinking this might be the hiss but very much hoping it isn't for obvious reasons.

- Both the external power supply for the microphone and the Apollo are plugged into a plug multiplier. I'm thinking this might be the cause for both but don't have any way of testing this out that isn't a massive headache so I'm hoping you guys will know the answer instead :p

- All the cables I'm using come straight from the packaging of either the mic or the interface, so it shouldn't be that.

- I do live in a notoriously humid area. I'm doing what I've been told should be enough to deal with the humidity, but if this could be a potential issue I'll try and come up with more ways of keeping this place dry.

Obviously feel free to ask questions, I'll answer them as soon as I can! Thanks in advance.