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 Post subject: High frequency hiss from AP 800
PostPosted: Thu Oct 20, 2011 12:02 pm 
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Joined: Thu Oct 20, 2011 11:55 am
Posts: 1

Hi
We have an AP 800 ( I know it is old about 12 years old actually). We use it in our classroom audio system. We have a few microphones plugged in and then the AP 800 feeds some power amps and speakers in the classroom. We are having a problem in that we hear a high pitched noise from the AP 800. It is more like a hiss and we can hear it out of both Output A and Output B. If we shut off the AP 800 the hiss goes away. So I do not think it is our power amps or speakers. If I disconnect all of othe inputs to the AP 800 the hiss remains so I do not think it is something with the microphones. It almost seems like a gate is not closing for one of the inputs. Any suggestions on trying to narrow down what might be generating this high frequency hiss?


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