Without being rude, where do you guys put the volume control? - diyAudio
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Old 31st August 2004, 12:42 PM   #1
rabbitz is offline rabbitz  Australia
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Default Without being rude, where do you guys put the volume control?

I've seen the volume pot added before the preamp, sometimes after the preamp, sometimes between the gain stages in the preamp.

Is there a preferred position that gives a better performance or is it dependant on the preamp design? Does the same also apply to added tone controls or equalisation?
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Old 31st August 2004, 12:58 PM   #2
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It's usually a trade-off between noise and overload headroom.

If you put the gain control pot right at the input, then obviously you get the best immunity to clipping, but all the stages after the pot are operating at max gain and each will be adding noise.

Conversely if you put the pot late in the signal chain, then as you turn down the volume, you are also reducing the noise. The problem is that a high-level input could cause stages before the gain-control to clip.

That's why the control is often about half-way down the chain! Wherever you put it, be careful that the stages before the pot aren't going to clip. (perhaps by giving each input its own input-level setting pot.)
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Old 1st September 2004, 02:41 PM   #3
rabbitz is offline rabbitz  Australia
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Thanks for your reply........ very informative.

Cheers
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Old 1st September 2004, 03:03 PM   #4
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There was once a Marantz amp with volume control in two different stages (using a quadruple ganged pot) in order to get the best compromise between headroom and noise performance.

Regards

Charles
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Old 1st September 2004, 03:08 PM   #5
rabbitz is offline rabbitz  Australia
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I have enough trouble with a dual pot.
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Old 2nd September 2004, 09:37 AM   #6
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But the four gang pot may be a linear taper, they track better.
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