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Author Topic: Gain misconceptions  (Read 1447 times)

James Wright

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Gain misconceptions
« on: July 03, 2012, 09:25:52 am »

Hi,

I remember reading a long string of posts on here a while back about input gain levels. The post ended up putting to bed the misconception about reducing feedback by turning down input gain and turning it back up further down the line...i.e. gain is gain, but put in a more eloquent way.

I have tried searching for the post, but to no avail. Can anyone help me in finding it again.

Thanks
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John Roberts {JR}

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Re: Gain misconceptions
« Reply #1 on: July 03, 2012, 09:52:07 am »

I don't know about that post, but in the context of feedback it is the total loop gain and response that matters. Gain from multiple stages in series is additive, so only the total gain matters, not where in the loop it occurs.

JR
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Charlie Zureki

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Re: Gain misconceptions
« Reply #2 on: July 03, 2012, 11:41:10 am »

I don't know about that post, but in the context of feedback it is the total loop gain and response that matters. Gain from multiple stages in series is additive, so only the total gain matters, not where in the loop it occurs.

JR

    :)  Nice answer J.R., short, and to the point...

   Hammer
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James Wright

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Re: Gain misconceptions
« Reply #3 on: July 03, 2012, 12:30:24 pm »

Thanks John Roberts, thats great.

I was having a debate with a colleague about this matter and that is a far better statement than I could make.

Cheers!
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Ivan Beaver

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Re: Gain misconceptions
« Reply #4 on: July 04, 2012, 07:50:48 pm »

Thanks John Roberts, thats great.

I was having a debate with a colleague about this matter and that is a far better statement than I could make.

Cheers!
Think about it this way.  If there was a way to have a single point of gain that would greatly reduce feedback (if the gain was made at that point), then all manufacturers would put the gain there.

There is no magic bullet.
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A complex question is easily answered by a simple-easy to understand WRONG answer!

Ivan Beaver
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PHYSICS- NOT FADS!

dick rees

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Re: Gain misconceptions
« Reply #5 on: July 04, 2012, 08:57:22 pm »

Think about it this way.  If there was a way to have a single point of  feed..........

There is no magic bullet.

Au contraire, mon frere

"As seen on TV!!!!!!"
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Ivan Beaver

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Re: Gain misconceptions
« Reply #6 on: July 04, 2012, 09:06:28 pm »

Au contraire, mon frere

"As seen on TV!!!!!!"
Is that a balanced or unbalanced connection on that one?
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A complex question is easily answered by a simple-easy to understand WRONG answer!

Ivan Beaver
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PHYSICS- NOT FADS!

dick rees

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Re: Gain misconceptions
« Reply #7 on: July 04, 2012, 09:31:43 pm »

Is that a balanced or unbalanced connection on that one?

I think it's like my automatic washer.  If the load is unbalanced, it stops spinning and an alarm goes off.
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Jonathan Johnson

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Re: Gain misconceptions
« Reply #8 on: July 09, 2012, 01:40:05 am »

Is that a balanced or unbalanced connection on that one?
It depends on the sources you are mixing.

The higher the concentration of C2H6O in the source, the less balanced the audience will be.
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Ryan Lantzy

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Re: Gain misconceptions
« Reply #9 on: July 12, 2012, 09:00:22 am »

Hi,

I remember reading a long string of posts on here a while back about input gain levels. The post ended up putting to bed the misconception about reducing feedback by turning down input gain and turning it back up further down the line...i.e. gain is gain, but put in a more eloquent way.

I have tried searching for the post, but to no avail. Can anyone help me in finding it again.

Thanks

One thing I would add to what others have said...  *If* you have a console with a particularly badly designed mic preamp, and an idiot operator, excessive gain at the preamp stage with massive attenuation down the line may cause issues.  The issues arise from said badly designed mic preamp causing some response change in the circuit path.  Granted, this is probably only going to be a problem in extreme cases.

As JR said, it's still about total gain and *response*.  Just don't forget about response and what influences it.
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"In the beginner's mind the possibilities are many, in the expert's mind they are few."
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