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Old 19th August 2014, 12:57 AM   #1
diyAudio Member
Join Date: Aug 2014
Default Replace caps on Class D amp to improve sound?

Hi Everyone, First Post!

I recently bought a cheapie Class D amp off ebay, a Line5 A960. 50w x2.
Only $20 in an auction, so i thought 'what the hey'.

However upon listening the sound is very muddy, there are almost no high frequencies.

I was thinking maybe changing the caps might improve the sound.

At the moment, the stock ones are 'Chong' brand. sounds pretty dodgy.

These are the caps listed:

2x Nichicon 10000uf 25v 'VZ(M)'
8x Chong 10uf 50v 'CD11X'
3x Chong 100uf 50v 'CD11X'
2x Chong 470uf 35v 'CD11X'
2x Chong 47uf 50v 'CD110X'

I've also attached some photos of the board layout.

What would be some good replacements? Looking for bang for buck.

Any advice would be much appreciated!

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Old 19th August 2014, 05:10 AM   #2
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WIthout knowing which chips are used any advice is going to be rather hit-and-miss. I'd swap out the two large Nichicons first as they have a high chance of being fakes. Then I'd investigate the opamps which look to have been painted over - perhaps swap them out for NE5532s.
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Old 19th August 2014, 10:39 AM   #3
godfrey is online now godfrey  South Africa
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Location: Cape Town
What kind of power supply are you using? You won't get much out of it with a cheapo wall-wart, for example.
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Old 19th August 2014, 01:19 PM   #4
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You can't squeeze blood out of a turnip. It would be a crap design with good caps. My guess would be no improvement in high end response.
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