Rig: Genz Benz Shuttle 6.2 on top of an Acme B2, series 2. All this perched on a wooden barstool so it's close to my ears. Bass: Tobias Growler 4, 1st gen. Problem: If I stand to the side of my rig with my bass strapped as usual, I suddenly get high pitched whine/feedback, rather loud. Bass is at cabinet height. It doesn't happen if I'm positioned between the bass and rig. Not string vibration related. This is a somewhat manageable problem (i.e. don't stand there) but it constricts my movement at times, and if it's without a stand I can't lean my bass against the cab during a break. I don't understand why it is happening to begin with. Ideas?
It's likely that the pickup may be picking up something being radiated by the amp, though that's unusual (first time I have seen this symptom with your amp). By any chance, are you using a wireless with your bass? Does the noise change if you tap your amp or your pickup?
Cell phone nearby? I’ve experienced something similar years ago, enough years that it was a flip phone. I had to take it out of my pockets when playing. I also added some shielding to the electronics cavity, (Ibanez 505, kind of noisy anyway) seemed to help.
I hadn't thought about the cellphone, which is usually in my pocket while playing. I'll investigate that as well. Growlers are known for their rats nest of wiring, but there's no skimping on the shielding.
IME, the modern generations of phones don't exhibit that same effect of generating extraneous RF-based noises in nearby inputs. It used to be a real problem. especially if you left a phone on top of your amp, near the inputs. It only happened when the phone 'rang'. The absolute worst case was putting a phone down on an audio console with a couple of dozen inputs active...after a while, you learned to recognize that sound. But as I say, I haven't had that experience in some years now. I'm inclined to believe @agedhorse's diagnosis.
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