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Old 8th August 2012, 10:28 AM   #11
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Location: D-55629 Schwarzerden
Default Ecaxt basically Design Rules for variable Loudness Control wanted

How I calculate the necessary elements for the network, if I know already the value for my speaker efficiency?
About the URL
Reverse of the old Loudness Control
I read a lot of informations but not the right way therefore.
there are a wide range of examples, but no clear guidelines.
Thank you for advices.
in this case this could be of interest:
check also out at the end of this article the mentioned references.

Last edited by tiefbassuebertr; 8th August 2012 at 10:56 AM.
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Old 8th August 2012, 03:33 PM   #12
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You have no need to calculate anything, that circuit just goes between a pre amp and a power amp.

These days there are many circuits around that have multi-band dynamic compensation and so on, but that is a simple passive circuit similar to the ones found in such things as Mac Intosh amplifiers of the sixties and seventies.

If you want something fancier than this in the analogue domain, things get very complex very quickly, that's why the digital chips have appeared, if you want an all singing all dancing one, use one of these.
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Old 12th February 2013, 09:43 AM   #13
dgta is offline dgta  United States
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Is that pot log or linear in the McIntosh gear?
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Old 13th February 2013, 05:28 AM   #14
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I can't find the McIntosh schematic, but the one I described has a 10k linear pot, an installation of it is here...

Hi-Fi Projects Extraordinary POQX Analogue Signal Processor

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Old 13th February 2013, 07:24 AM   #15
dgta is offline dgta  United States
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That's interesting, thanks. I would have thought log taper would be more appropriate. Once you set the volume pot, you're using the loudness pot to vary the SPL in the room. So it seems a log taper would be more "ergonomic". I've had Yamaha amps with this feature and it worked well, but never looked to see what kind of pot they used. I assumed log.
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Old 11th April 2013, 10:17 PM   #16
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Originally Posted by rcw666 View Post
This is a passive loudness circuit that can be put on the end of a pre amp...

Click the image to open in full size.

The effect as you turn the pot over full rotation is...

Click the image to open in full size.

The 33k resistor is just to simulate a typical load and is not needed it will drive a following circuit over about a 20-100k range withought very much change in the frequency response.

The component values can be scaled to for instance use the 10k motorised pot widely available here in Oz. In this case just double all resistors and halve capacitors.
Very interesting. And, what about using it in an Integrated Amp which has the pre-out and main-in already linked inside?
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