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Old 26th April 2011, 08:19 PM   #1
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Default Lack of bass with LM3886

Hello everybody,

I have built a complete "chipamp" (amp + Psu) kit, double mono, powered by 2X300VA transformers.

Sounds good, but compared to my small "NAD 3020" and to a big "Kenwood" L1000M, using the same loudspeakers, I feel a lake of bass, which is very frustrating.

I was about to upgrade the caps of the PSU to Munsdorf 15000 microF/18mohm instead of the Panasonic 10000 microF/36mhom.

Should I go this way or may be the limitation is part of the LM3886 itself ? In that case would be better to change for another type of amp (4981x or discrete)

Any experiences will be appreciated.

Thank You for the help.
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Old 26th April 2011, 09:06 PM   #2
tinitus is offline tinitus  Europe
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hi

lake ?
do you mean lack of bass

would you want me to correct it ?


moderation
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Old 26th April 2011, 11:04 PM   #3
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How deep is the lake?
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Old 26th April 2011, 11:25 PM   #4
infinia is offline infinia  United States
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lake of bass fishing?
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Old 26th April 2011, 11:29 PM   #5
N Brock is offline N Brock  United States
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Quote:
Originally Posted by tinitus View Post
do you mean lack of bass

would you want me to correct it ?
reminds me of this guy
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Old 26th April 2011, 11:42 PM   #6
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I actually swam on Lake Bass as a child. Areas of it are muddy.

Last edited by ficklecycler; 27th April 2011 at 12:00 AM.
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Old 27th April 2011, 12:19 AM   #7
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I don't think changing the caps will make much difference. The problem probably lies elsewhere. Can you measure the frequency response? Sometimes a bit of a tilt upwards will sound like a lack of bass. There's also the gain issue. Whatever's louder sounds better. When you listen, is the level the same? Is there any subtle oscillation going on? If the chip amp runs warm that's a possibility, and the tiniest amount of oscillation, IMHO, affects the sound. Where do the speaker returns physically connect in the amp in relation to the circuit grounds? It matters!
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Old 27th April 2011, 12:27 AM   #8
infinia is offline infinia  United States
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sometimes old receivers have a bit of bass EQ even when tone controls are set flat. If they have a loop connection you can plug the chip amp up , bypassing the built-in amp and check difference there.
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Old 27th April 2011, 12:49 AM   #9
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It would help if you said what kit you've bought. I agree with Conrad, the lack of bass could easily be an overly bright sound. Brightness that I've experienced with chipamps I've fixed with relatively minor circuit and layout changes.
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Old 27th April 2011, 05:54 AM   #10
gootee is offline gootee  United States
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To get any real help you would almost have to post or link to the schematic and photos of your built unit.
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