So, I've been playing classical guitar in the subway of Paris for almost 3 weeks now. I'm using this stuff:
-Plain classical Guitar
-Condenser microphone pickup: AKG C411 L
-Phantom Power ("pre-amp"): AKG B29 L
-Portable PA system: Behringer MPA40BT pro
The sound is decent, when acoustics are fine. But i'm having an issue with a weird chorus sounding interference.
Whenever I'm playing in a confined space and a large group of people pass near me, their smartphones make some interference that sound like if I had a cheap chorus pedal as an effect. I have trouble repeting the experience at home but I believe it must be people's smartphones.
It's annoying to hear when you play Cavatina and stuff. I'm not sure where is comes from in my gear.
-Doesn't seem to be the PA according to some test.
-Could it be the more than 5meters XLR cable ?
-Or is the C411 mic, a small part of the wire is naked ?
Any help is welcomed