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reduce loudness circult
reduce loudness circult
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Old 25th July 2021, 08:21 PM   #1
Philip C is offline Philip C
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Default reduce loudness circult

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?PM6006 Integrated Amplifier Service Manual PG9.pdf

Last edited by Philip C; 25th July 2021 at 08:23 PM. Reason: wrong heading
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Old 25th July 2021, 08:31 PM   #2
rayma is online now rayma  United States
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Changing the feedback network could cause high frequency instability.
A series 50k to 100k before the volume control would do this safely.

Last edited by rayma; 25th July 2021 at 08:33 PM.
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Old 26th July 2021, 06:04 PM   #3
Philip C is offline Philip C
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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"?
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Old 27th July 2021, 02:23 AM   #4
rayma is online now rayma  United States
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I think it will be ok, give it a try.
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Old 1st August 2021, 07:10 AM   #5
Philip C is offline Philip C
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If I want to remove the "treble lift" in the loudness circuit, should I remove and short C2501 / C2502?
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Old 7th August 2021, 07:58 AM   #6
Philip C is offline Philip C
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anyone please?
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Old 7th August 2021, 04:02 PM   #7
rayma is online now rayma  United States
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Looks like you would just remove them, but don't short them.
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Old 9th August 2021, 09:48 PM   #8
Philip C is offline Philip C
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thanks and will report on findings later!
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Old 9th August 2021, 09:52 PM   #9
HumbleDeer is offline HumbleDeer  Belgium
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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.
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Old 9th August 2021, 10:27 PM   #10
Charles Darwin is offline Charles Darwin  United Kingdom
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Quote:
Originally Posted by Philip C View Post
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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