My Equipment:Yamaha MG 24/14fx Mixing ConsoleYamaha PS7000 Amp (Running Yamaha SW118 Subs)Yamaha PS3500 Amp (Running Yamaha SV115 Mains)Today I attempted to set my system gain. Would just like some feedback as to wether I did it correctly, anything I might have missed, done wrong etc...1. Turned amp sensitivity all the way down.2. Unhooked Speaker.3. Hooked Input device through Stereo Channel on mixer.4. Turned fader all the way down on channel.5. Set stereo bus fader to "0"6. Ran Pink Noise through channel to set input level.7. Adjusted gain on channel to set level just above "0" (+3...mixer goes to +5 then clip)8. Maxed out fader on channel with Pink Noise. Level was just barely clipping so I backed off the gain a touch. 9. Rolled up the sensitivity on the amp channels until they clipped, then backed them off 1-2 notches.Does it sound like I did any of it right or am I even close?
Some questions:Were you at clip or just below clip on your master output when you set the amps to at/just below clip?Did you have the filter engaged for the subs when you set the amps to at/just below clipYou are aware that you adjusted the input attenuators and not input sensitivity?I'm pretty sure that it would work better to have had a dummy load connected or to just look up to voltages in the manual and done some basic math and gotten to an approximate exact number.From what is see in the manual the PS3500 will clip before the PS7000, you will probably have the attenuator on one set around 20 and the other just before the 25 mark on the amp if I look at it quickly.
5. Set stereo bus fader to "0"
8. Maxed out fader on channel
There are basically 3 ways to set "system gain".1: For the most dynamic range. This DOES NOT mean it will get any louder. But if setup properly it will get quieter.Not in max output, but rather by lowering the noise floor.2: Have "0" on the console indicate where the amps are clipping.3: Have "0" on the console indicate some predetermined SPL. This is most common in Churches.There are of course some variations, but those are the basic ones.So FIRSTS you need to determine what you want to accomplish by "setting system gain".Then use the method to suite that end.
The common wisdom is to set up the gain structure such that everything clips simultaneously. Unless the system has a LOT of headroom over what you'll need, I disagree with this methodology. Most "weekend warrior" systems will occasionally (if not often) be run hot enough that there will be a little amp clipping. This can slip by relatively unnoticed if it's not too much too often. However if something else in the system clips at the same time, it will sound BAD. You want headroom in everything ahead of the amps so that there is no chance of clipping anyplace else. If you are using system limiters, this this is especially important.
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