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-   -   reduce loudness circult (https://www.diyaudio.com/forums/solid-state/375010-reduce-loudness-circult.html)

Philip C 25th July 2021 08:21 PM

reduce loudness circult
 
1 Attachment(s)
Hi, I have a loudness circuit which need to reduce "output". how may I achieve this by fixed resistors by around 6-9db? How to calculate values?Attachment 969802

rayma 25th July 2021 08:31 PM

Changing the feedback network could cause high frequency instability.
A series 50k to 100k before the volume control would do this safely.

Philip C 26th July 2021 06:04 PM

Thanks for your speedy reply!
if I put a 50K resistors after C2503/2504 (100V 0.1uf), would it not change the original circuit when in "no loudness mode"?

rayma 27th July 2021 02:23 AM

I think it will be ok, give it a try.

Philip C 1st August 2021 07:10 AM

If I want to remove the "treble lift" in the loudness circuit, should I remove and short C2501 / C2502?

Philip C 7th August 2021 07:58 AM

anyone please?

rayma 7th August 2021 04:02 PM

Looks like you would just remove them, but don't short them.

Philip C 9th August 2021 09:48 PM

thanks and will report on findings later!

HumbleDeer 9th August 2021 09:52 PM

The "Loudness' Circuit is oftentimes what they call the hearing curve compensation. It is a special dynamic type of EQ that adjusts the sound to the human hearing sensitivity when levels are below a certain threshold. Not enabling it should have it disabled. It is not active when it is not enabled. :)

Charles Darwin 9th August 2021 10:27 PM

Quote:

Originally Posted by Philip C (https://www.diyaudio.com/forums/solid-state/375010-reduce-loudness-circult-post6739132.html#post6739132)
If I want to remove the "treble lift" in the loudness circuit, should I remove and short C2501 / C2502?

Switch the 'Loudness' off and use the bass eq to boost instead.

I see no need to go inside the thing.


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