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Old 4th November 2007, 08:52 PM   #1
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Join Date: May 2004
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Question What output filter to choose

Im tweaking my M-Audio Delta 1010 soundcard and wonder what output filter topology would be best soundwise. The 1010
uses AKM AK4293 DeltaSigma DACs; the outputs will run into a preamp via short (20") RCA cables.

This is the current differential output filter design:

Click the image to open in full size.

As I dont need differential outputs this seems to be suitable:

Click the image to open in full size.

This is a passive filter I found here: http://www.dcx2496.fr/en/tweakanalog2.php

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What should I do? Leave the filter as it is, use the summing or passive one?

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Old 6th November 2007, 03:15 PM   #2
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Old 9th November 2007, 01:06 PM   #3
Wombat is offline Wombat  Germany
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I am not the technic man but Slimdevices Transporter uses a similar output as the first one. Most likely they only choosed it for offering Balanced output.
The passive one is a matter of luck i believe. I doubt the DAC itself can handle the capacitive load anywhere near a OP amp can (i may be totaly wriong here)
So the simple second filter is what i would try but could be you need some caps in the output for DC.
If time permits - stuff some parsley in your ears and listen how it grows!
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