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Audio GD DIY Update
Audio GD DIY Update
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Old 8th January 2019, 12:59 PM   #1
Ugg10 is online now Ugg10  United Kingdom
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Join Date: Nov 2017
Location: UK
Default Audio GD DIY Update

Note - this is pretty basic compared with work usually documented on this site but thought it may be interesting to someone.


I have decided my Audio GD NFB3.1 Dual Wolfson WM8741 dac is a keeper and for use with active studio monitors I have been using a passive preamp (SMPro M-Patch) which I much prefer as it keeps the sound of the dac right through to the speakers.


Having bought the passive preamp with two inputs and two outputs to play around with a subwoofer and different sources I am now settled on using just the dac with 8” Mackie HR824 monitors.


Firstly, one issue with the Dac was that it came with a Tenor 8802 usb card which has never really worked properly due to obsolescence and lack of decent win10 drivers. So, I bought an Amanero USB card from Audio GD to upgrade this.


Secondly to replace the passive preamp I bought a ladder style stereo attenuator which will act as a volume control (actually an output reducer really as the dac puts out a healthy 2.5v normally, plenty to drive the speakers).


Usb card took 10 minutes to change and the volume knob about two hours. The usb card is a simple unbolt, plug in and rebolt job as I specified the connect when ordering form Audio GD. The Attenuator was soldered in as per the spec sheet in the output lines and then a hole drilled in the front panel.


So here’s a few pictures. The outcome is as good as I expected with no appreciable change to the sound but in a neat single box for controlling my speakers. Happy other than it needs a nice aluminium knob to replace the one at the moment robbed from an old rotel amp in the loft.


Original


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New USB Card



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Stereo ladder style attenuator (stereo Dale resistors 10k)



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Plumbed in



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New front view



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