Xlr output signal too high - Mesa Big Block 750

Jun 13, 2016
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Hi !!! I own a big block 750 everything seem to work fine except for the Xlr output, signal is too high to be use, even with the Direct Output level to minimum ! Im not sure what can cause this ?

Thanks
 
Hi !!! I own a big block 750 everything seem to work fine except for the Xlr output, signal is too high to be use, even with the Direct Output level to minimum ! Im not sure what can cause this ?

Thanks
Line level out, to mic level in, can cause this.
Most mixers/PA systems should be able to handle both levels, either by a switch, a level control or by having dedicated inputs for mic level or line level.
If all else fails, you can get an XLR line to mic attenuator.

I looked at the manual but it didn't list specs. So can't tell about XLR output levels.
 
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Line level out, to mic level in, can cause this.
Most mixers/PA systems should be able to handle both levels, either by a switch, a level control or by having dedicated inputs for mic level or line level.
If all else fails, you can get an XLR line to mic attenuator.
Sound enginner have said that cause problem, never heard of Xlr line to mic attenuator sound like something i should try
 
Sound enginner have said that cause problem, never heard of Xlr line to mic attenuator sound like something i should try
Check with the sound guy about levels into his board first.
I have trouble imagining a board that can't handle both.

Are you sure the sound guy knows what he's doing?
The world is littered with people who fancy themselves as mixing engineers.
In fact, truley good ones are hard to find.
 
I just checked the docs. and the level control should be able to turn the output all the way down. This leads me to believe that you have a broken level control which can cause your symptoms.

Where are you located?
 
Check with the sound guy about levels into his board first.
I have trouble imagining a board that can't handle both.

Are you sure the sound guy knows what he's doing?
The world is littered with people who fancy themselves as mixing engineers.
In fact, truley good ones are hard to find.
We own a old mixing console and i got the same peak problem, can i check the output voltage with a voltmeter or the resistance, maybe the line level control is broken ?
 
I just checked the docs. and the level control should be able to turn the output all the way down. This leads me to believe that you have a broken level control which can cause your symptoms.

Where are you located?
Quebec city, Canada
Is something i can check with a ohmmeter ? level control is a variable resistance ?
 
Quebec city, Canada
Is something i can check with a ohmmeter ? level control is a variable resistance ?
If you can clip on to pins 2 and 3 and set the meter to the lowest AC scale you should be able to get a reading while playing. Check it with the control at both ends of the range and see if there is any difference in the voltage reading.

-edit-
The above assumes that it can produce line level output.
If it's mic level only you probably won't read anything on the meter.
But having a control, at least suggests that it can adjust from line to mic.

Another way to test it might be to try it in a different mixer that can handle both mic and line inputs. Then set an audio level that you can see on the mixer and then adjust the XLR control and see if you get level changes out if the XLR.
 
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The control ranges from mic to line.

If the control is broken, it's possible that there's more circuit gain present than necessary.

The test is to turn the level all the way down and the level should be very low to zero. If it remains very high, the control is damaged (or somebody got in there and "modified" it, then all bets are off).