Can two CS8412 sound different ? - diyAudio
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Old 27th December 2006, 03:36 PM   #1
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Default Can two CS8412 sound different ?

I have two pieces of CS8412 and I believe one of them sounds better ( more open ) with 4 DACs per channel.

With one DAC per channel I'm not sure yet.

Also with 4 DACs per channel there is a click tone every second only with the better CS8412 in silent passages. That gets worse ( faster ) when I touch the data line.
With one DAC per channel there is no such problem with that chip.

For sound comparison I make a fast change of CS8412 while power is on and music playing...
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Old 27th December 2006, 03:48 PM   #2
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Default Re: Can two CS8412 sound different ?

Quote:
Originally posted by Bernhard


Also with 4 DACs per channel there is a click tone every second only with the better CS8412 in silent passages. That gets worse ( faster ) when I touch the data line.

The loading is marginal.
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Old 27th December 2006, 03:48 PM   #3
hifi is offline hifi  Sweden
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When are they made? There are suppose to be some differences between modern and pre ~93-95 chips if memory serves.
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Old 29th December 2006, 02:08 AM   #4
Ruach is offline Ruach  Singapore
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What are the date codes of your CS8412?
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Old 31st December 2006, 11:50 AM   #5
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The better chip has date code 9924 and the worse one 9442.

So the newer chip sounds better but seems to have less drive capability ???

My non os setup is:

Word clock goes to one HC04 inverter input, output goes to 4 PCM56 pins of one channel & another HC04 input, output to 4 inputs of other channel.

Each other line goes to 8 PCM56 inputs directly.

Before I tried word clock to one HC04 inverter & 4 PCM56 pins of one channel, HC04 output to 4 inputs of other channel and it had more problems with clicking noise.

Do 8414/16 sound better ?

I found a smd date code 9529, is it a new one ?
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Old 31st December 2006, 01:46 PM   #6
lucpes is offline lucpes  Romania
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Bernhard - I'm very interested in building a dac using PCM56, could you post a schematic of yours?
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Old 3rd January 2007, 08:52 PM   #7
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I have no drawn schematic of my DAC, it is the standard receiver schematic with inverter for word clock on one channel. Passive I/V 500 ohm per one DAC chip. Transformer with small cap on secondary for filtering + standard op amp output buffer.

Now I'm fiddling with 4 parallel chips per channel to cancel DLE without using MSB adjustment pot.
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Old 3rd January 2007, 09:28 PM   #8
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So one is channel is half a sample late.
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Old 3rd January 2007, 09:35 PM   #9
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Quote:
Originally posted by rfbrw
So one is channel is half a sample late.
I know.

Perhaps can you tell me why it tends to make clicks when driving parallel DACs ???
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Old 3rd January 2007, 10:00 PM   #10
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Quote:
Originally posted by Bernhard


I know.
I suppose as you are not one of those who claim to be able to hear picoseconds of jitter it doesn't matter but I would still get rid of the delay. It is very easy with 16 bit dacs.

Quote:

Perhaps can you tell me why it tends to make clicks when driving parallel DACs ???

My remote viewing skills are not what they used to be when the spoonbender and I were in business but I'll give it a shot.
If it is just one CS8412, then perhaps it is out of spec, damaged or dying. Try using a buffer. If both are causing problems then perhaps one of your PCM56's is at fault. Another thing to do is look at the signal on the scope. Mind you, driving 8 data inputs without a buffer is asking for trouble.
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