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Old 16th August 2011, 09:03 PM   #1
Ryssen is offline Ryssen  Sweden
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Default Capacitor at voltage DAC output

It is very popular to put a transformer at output of e.x CS4398 and AK4398.
But how about putting 2 high quality capacitors.
Would they sound worse?
Anyone compared?
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Old 16th August 2011, 09:31 PM   #2
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Originally Posted by Ryssen View Post
It is very popular to put a transformer at output of e.x CS4398 and AK4398.
But how about putting 2 high quality capacitors.
Would they sound worse?
Anyone compared?
Why not connect directly without either transformer or capacitor?
Then there is zero degradation of the audio signal.
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Old 16th August 2011, 09:40 PM   #3
Ryssen is offline Ryssen  Sweden
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Thereīs 2v DC on the DACīs output,the trafo or the caps blocks the DC so it wont reach the preamp or the amplifiers input.
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Old 16th August 2011, 10:04 PM   #4
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Thereīs 2v DC on the DACīs output,the trafo or the caps blocks the DC so it wont reach the preamp or the amplifiers input.
Just make a virtual ground with two resistors from the plus voltage to ground. The midpoint are at the DAC output voltage.
50 or 100 ohm works OK.
A JFET buffer makes it even better, but the resistors alone sounds much better than capacitors or transformers.
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Old 16th August 2011, 10:28 PM   #5
Ryssen is offline Ryssen  Sweden
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You mean



Out - ---100ohm----__ Output to preamp
AK4398 Out + ---100ohm----


Sorry but it gets distorted when I posts.
Hope you can se what i mean.

Last edited by Ryssen; 16th August 2011 at 10:30 PM.
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Old 17th August 2011, 08:53 AM   #6
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Quote:
Originally Posted by Ryssen View Post
You mean
Out - ---100ohm----__ Output to preamp
AK4398 Out + ---100ohm----


Sorry but it gets distorted when I posts.
Hope you can se what i mean.

One resistor from the DAC PSU +voltage to virtual GND.
One resistor from the virtual GND to the real GND.
The virtual GND (midpoint between the resistors)
will now have the same voltage DC potential as the DAC outputs.

The "real" GND must not be used as it is the virtual GND you connect to your amplifier.
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Old 17th August 2011, 10:43 AM   #7
Ryssen is offline Ryssen  Sweden
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But what if the amp after doesnīt have floating ground,wont the virual ground get shorted then?
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Old 17th August 2011, 07:36 PM   #8
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But what if the amp after doesnīt have floating ground,wont the virual ground get shorted then?
I use only ONE connection to mains ground to avoid ground loops...
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