Hi.
I'm looking to lower the gain of my Denon integrated. As it has to much gain for modern sources (input sensitivity is 125mV) and Gain in Amp stage is a whopping 45,5dB.
The easy way would be to add some external attuniator s i guess, but that feels like a bad solution.
I would like to reduce the stepup in the voltage amp stage but sadly my skills in electronics are not up to par with the task.
So is there any experts here that can advise on any adjustments so that the input sensitivity would be about 300-500mV,and gain 39-34dB
I'm looking to lower the gain of my Denon integrated. As it has to much gain for modern sources (input sensitivity is 125mV) and Gain in Amp stage is a whopping 45,5dB.
The easy way would be to add some external attuniator s i guess, but that feels like a bad solution.
I would like to reduce the stepup in the voltage amp stage but sadly my skills in electronics are not up to par with the task.
So is there any experts here that can advise on any adjustments so that the input sensitivity would be about 300-500mV,and gain 39-34dB
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I had a quick look at the schematic, and it should be possible to reduce the gain either in the input stage (at the opamps) or in the output stage (in the power amp).
In the latter case, you can lower the gain by modifying the resistors in the Negative fedback loop. The network is quite elaborate in this case - see attached. (It actually looks a bit like some older Luxman circuits).
The gain is basically determined by the relationship of R824 and R826 divided by R820. So if you increase the value of R820, it will reduce the gain.
With a 480R, you will get (app.) 30000/480 = 62 times gain, which is about 35 dB.
- But perhaps try with a 330R first, as it's not a good idea to modify the NFB values too much (at least not without a good understanding of the consequences).
In the latter case, you can lower the gain by modifying the resistors in the Negative fedback loop. The network is quite elaborate in this case - see attached. (It actually looks a bit like some older Luxman circuits).
The gain is basically determined by the relationship of R824 and R826 divided by R820. So if you increase the value of R820, it will reduce the gain.
With a 480R, you will get (app.) 30000/480 = 62 times gain, which is about 35 dB.
- But perhaps try with a 330R first, as it's not a good idea to modify the NFB values too much (at least not without a good understanding of the consequences).
Attachments
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Hi.
Sorry for not getting back sooner. I'll really appreciate the help. As you said, the build is somewhat complicated.
I took up on the 330ohm setting, didn't want to risk the amp even though it's quite cheap 😁
Worked like a charm, gain was reduced and if I'm not imagining also the bass got somewhat tightened.
So once again thank you..
BR. Danne
Sorry for not getting back sooner. I'll really appreciate the help. As you said, the build is somewhat complicated.
I took up on the 330ohm setting, didn't want to risk the amp even though it's quite cheap 😁
Worked like a charm, gain was reduced and if I'm not imagining also the bass got somewhat tightened.
So once again thank you..
BR. Danne
@Danne Lundin How is your amp? Still all good?
I assume that changing the bottom resistor won't change the response of the NFB filter since it is dominated by top resistors.
I assume that changing the bottom resistor won't change the response of the NFB filter since it is dominated by top resistors.
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