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Author Topic: 'testing' mixing console by overloading gain?  (Read 5222 times)

Dave Binski

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'testing' mixing console by overloading gain?
« on: February 07, 2011, 11:46:56 am »

Over the weekend I had a friend borrow one of my mixers and reported back that the pre-amps were broke on almost all the channels.  I was not aware the board had any issues, it's always sounded & performed well for what it is - an Allen Heath GL2400-24.

He determined it was broke by inserting a SM57 into each channel, turning the gain completely up and noticing a slight signal blip on LED on the neighboring channels.

When listening to the output - it sounds overloaded and crackling?  (no shit)

In 'normal' use of the board, gain/trim right round 15-20/unity.  I've never had to push it to max, on anything.  When operating at in this range, the board sounds fine.

Is this a proper technique of 'testing' a console?
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Tim McCulloch

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Re: 'testing' mixing console by overloading gain?
« Reply #1 on: February 07, 2011, 12:02:54 pm »

He's full of shit.
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Patrick Campbell

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Re: 'testing' mixing console by overloading gain?
« Reply #2 on: February 07, 2011, 12:29:51 pm »

Thank you Tim


1+++++++++
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Geoff Doane

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Re: 'testing' mixing console by overloading gain?
« Reply #3 on: February 07, 2011, 01:00:03 pm »

Tim McCulloch wrote on Mon, 07 February 2011 13:02

He's full of shit.


Hey Tim, don't hold back!  It's the last days of the forum.

Seriously, it sounds like there could be better power supply decoupling between the channels, but I still wouldn't worry about it.  I used a couple of these consoles for well over 10 years, and never had any problems like this.  Of course, I didn't abuse the mic pres either  Rolling Eyes

GTD
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Jay Barracato

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Re: 'testing' mixing console by overloading gain?
« Reply #4 on: February 07, 2011, 01:42:26 pm »

Ask him if you can "test" his car by putting it in neutral and pinning the gas pedal to the floor with a broom handle.
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Jay Barracato
Solomons MD

Dick Rees

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Re: 'testing' mixing console by overloading gain?
« Reply #5 on: February 07, 2011, 02:11:47 pm »

Jay Barracato wrote on Mon, 07 February 2011 12:42

Ask him if you can "test" his car by putting it in neutral and pinning the gas pedal to the floor with a broom handle.


I can think of at least one other appropriate use for the broom handle in this case........if he removes his head first.
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Dave Binski

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Re: 'testing' mixing console by overloading gain?
« Reply #6 on: February 07, 2011, 02:14:52 pm »

Well, that answers that.  I am not nuts.  Thanks for the double check.
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frank kayser

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Re: 'testing' mixing console by overloading gain?
« Reply #7 on: February 07, 2011, 04:54:39 pm »

Dave Binski wrote on Mon, 07 February 2011 14:14

Well, that answers that.  I am not nuts.  Thanks for the double check.

Twisted Evil Sorry to disappoint, Dave.  It does prove your friend is full of shit, but does nothing to mitigate an insanity plea! Laughing
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Joseph Mulvaney

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Re: 'testing' mixing console by overloading gain?
« Reply #8 on: February 07, 2011, 06:04:51 pm »

What a jackass (no offense to your friend.)  Yea...every single channel is broken  Rolling Eyes

Even an H3000 will behave like that if you crank the hell out of everything.

I would think twice about lending this guy your gear.  His "torture" tests are not doing it any good.
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jeff harrell

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Re: 'testing' mixing console by overloading gain?
« Reply #9 on: February 07, 2011, 06:26:07 pm »

a mic preamp has got to know its limitations ! the guy needs some edjee-cashekion<(popeyed talk) in mixing boards or something !
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