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After many hours of head scratching I've finally got this monitor thing cracked. I made the changes discussed with Soundian last week and these eliminated some of the problems. I then worked on them more with the help of the Hexagonal Pensioners and Keilan303 during the early part of the open mic night on Sunday evening. Some new unexpected feedback occured. I figured out this was due to linking the left and right front monitors which take a signal from both left and right vocal mics, the delay induced by the speed of sound was causing some kind of freaky effect. How I fixed this is my secret. Ask me no questions...

Today we fired everything up full blast when the bar was quiet and began to systematically weed out the rogue frequencies. This is a pretty serious test BTW LOL. The SM58s induce a small lower mid blip at 500Hz - a 3dB reduction on the vocal channels eliminated this. Aside from that everything out front was perfect. Stage side there was a 3dB blip at 112Hz and a 6dB blip at 500Hz again. 500Hz appears to be a bogeyman frequency for us, although it's far more evident in the monitors than out front.

I also added a HPF to the SM57s on the cabinets as these were picking up some low frequencies and muddying up the bass.

The end result is that it's possible to scream at the top of your lungs with the monitors and PA turned up full, and all the mics on and turned up full, when the room in empty, and only cause a split second of minor feedback. I might be able to eliminate that too, but the likelihood of anyone actually requiring to do this is nil. Reduce a vocal fader by 5dB and there is no hint of feedback.

We also tested this pelting out full volume jukebox from everything, and speaking/shouting into the vocal mics and this was accomplished without any noticable feedback.

Obviously a band will be the REAL test but I'm pretty confident that we have it cracked.

So THANK FUCK FOR THAT. Roll on the next band, I'm actually looking forward to live music again.


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