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Old 28th November 2002, 11:17 PM   #1
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Default staked DAC chips ??

Ive search around and seen couple of coments about stacking DAC chips..!!??!!..

Would having a 2 or more staked DAC (one on top of each other ?) chips make a improvement in the sound ??

Thanks


m.
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Old 28th November 2002, 11:30 PM   #2
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Default To stack or not to stack, that's the question

Depends on the chip itself if it is possible technically. Common ( but mostly temporarely ) practice with TDA1543's and I even saw a cd player once with stacked PCM63's. Kusonoki, the guy that started this non os thing, tried it but in his later designs he used only one TDA1543.If you have a DAC or cd player with these chips you can try it.

My advise ( for what it's worth ) : it's a waste of time and money.
The chips are NOT designed for this I would like to add.

It has some positive effects ( bass slam ) but the negative ( high tones were better before ) overrule them.

Oh oh, I have to run now
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Old 29th November 2002, 12:10 AM   #3
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What are the conditions that make the DAC eligible to be stacked??

My player has PCM66 I can not find any references about the chip anywhere so i have no idea how good the chip is supposed to perform...and since i have a extra chip i though to maybe go ahead and try....

m.
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Old 29th November 2002, 12:26 AM   #4
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Are you sure that these are PCM66 ? I know PCM56,58,63,67,69 but 66 I can't find in my pile of BB datasheets

Please see this thread what Elso has to say about paralleling DAC chips: Cheap DIY DAC
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Old 29th November 2002, 12:36 AM   #5
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yep...they are: bb pcm66p ..the player is a old sony portable..one of the top of the line....i even have another sony player the same age and it has 2 of them !!!..so it seems it is not a 1 model only chip..


look here...

http://www.omr-lab.com/D-Z555.shtml (this is the one with 2 ) i have that same model and it sounds very good (for a portable...)

hope this helps.....
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Old 29th November 2002, 12:45 AM   #6
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I stacked 2 PCM 1704 K in my DAC. Initially I didn't like the effect, but after shielding the chips with copper foil and shielding digital and analog parts of the board the was improvement. More info here: Parallel DACs
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Old 29th November 2002, 01:02 AM   #7
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thank you Peter for the link, that is the kind of info i was looking for..(but i search for stacked instead of paralel... )

if anyone has info about the pcm66..please let me know...

thank you all....

m.
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