Weiliang DAC dual mono 4497 way too loud

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Hey there!

I am new to the board and I have a question about the Weiliang Dual 4497 DAC (VR1.0 201813). The blue main board is labelled AK4497X2 V1.2.

The problem is that the analog output is way too loud, to the point of distortion. I am using the OPA1611a and OPA1612a opamps, but the problem is the same with the original installed opamps.

For some reason, it is most apparent with PCM on the optical and coaxial inputs, and not when playing DSD over USB.

Is there a way to get into settings of this DAC and tweak this DAC? Or maybe to download a technical manual?

Kind regards,

Eric
The Netherlands
 
What are you feeding the DAC into? Perhaps its not that the DAC itself is too loud, rather that your amp/preamp/whatever is too sensitive? Normal DAC output levels are 2VRMS which is more signal than the average amp can accept before clipping.

Chinese DAC boards almost always are based on the manufacturer's application info in the DAC datasheet, its rare to see any variations on that.
 
Abraxalito is right, for me.
Long time I have an old Weiliang DAC with Wolfson 8741 DACs. It works great and I don't want to change anything.

If you do not want to change the input of the amplifier, you have two options:
- simple: make an attenuator with resistors at the DAC output.
- better: volume pot and buffer on DAC output (I have one like that).
 
Sorry for the delay Eric.
I thought of one of these options:
 

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Joined 2002
OP does not need anything extra. Less is more. The signal is at the limit of distortion and that won't be solved by another stage. 3Veff is way too much (unbalanced).

Op needs his output stage to adhere to the 2Veff standard. So the feedback network of the output opamp needs to be changed so it will output 2Veff. In most cases just 2 resistors in total....

This is the point of using standards, if you keep to them things just work as intended :)
 
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