Venue 4Khz signal

[BCH]

HELP...We had an issue @ a theatre gig...any ideas???????????????

Our guitarist used a 70's strat & Tele the pickups, picked up a pulsing 4Khz signal, sounding like a cricket! We isolated mains, guitar, no hearing loop, or modem, phones, lights, wireless for iPad, no backline or monitors etc. I tried a passive p/u bass, same issue.

Anybody had this experience 

[Downunderwonder]

18 minutes ago, BCH said:

We isolated mains, guitar, no hearing loop, or modem, phones, lights, wireless for iPad, no backline or monitors etc

No makey sense to me.

 

4kHz = an undisclosed hearing aid gone bezerk?

[oldslapper]

1 hour ago, Downunderwonder said:

No makey sense to me.

 

4kHz = an undisclosed hearing aid gone bezerk?

Pardon??

 

 

 

 

 

 

sorry, no help whatsoever. 

[Johannes]

Most likely it is caused by venue’s induction loop. Common problem with single-coil pickups. 

[Johannes]

Sometimes the local staff present dont know about the existence of the loop. I’ve seen it happen. 

[BCH]

24 minutes ago, Johannes said:

Sometimes the local staff present dont know about the existence of the loop. I’ve seen it happen. 

I think your spot on...the theatre sound guy was not at the performance!

[Dad3353]

If in a rural location, an electric fence might be the source of such interference. It's the case at our cottage; the car picks it up when tuned to Radio 4 long wave, too.