Sound is muffled

jefflowkh

New member
Hi,
I'm new to the forum, I'm actually a teacher who helps out with the PA during our annual sports event in school. There was an issue that persisted for the past two years - whenever there are a few inputs to the mixer (two persons speaking at the same time and music playing through an ipod) such that it is very loud, the output sound suddenly becomes muffled. I've checked that the audio output bar is still within the green range.
The muffled sound is like the treble just go missing, you only have the bass and the mids. The sound returns back to normal when the input is not that loud.
I'm using a Yamaha MG166CX mixer, Yamaha PS3500 power amps and Yamaha BR12 speakers (EQ is usually bypassed).

Any idea?
 
No chance because it is quite hard to reproduce it when event over... Could it be amps? Because the amps were replaced two years ago
 
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