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Old 11th March 2003, 04:36 PM   #1
A 8 is offline A 8  Sweden
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Default BB PCM 1702 vs 1704

I am buliding a dac and need to decide between the BB PCM 1702K and the PCM 1704K.
I prefer the 1702 as it is easier to implement in a DIY application however I want the best I can get so can anyone provide some advice?

I have tested both chips and percieved the 1704 to give better low level resolution but in all fairness it was not a completly comparably set up (DIY bit clock as compared to a std one and slightly different layout) whick is why I am confused, afterall the only datasheet benefit (on 16-20 bit material) of the 1704 is slightly (1-2 dB) lower THD at 0dB.
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Old 11th March 2003, 10:11 PM   #2
johnny1 is offline johnny1  Greece
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Well..Pcm1702 is a sigma-delta DAC and PCM 1704 is a multibit DAC.
Besides technical data, PCM1704 is considered to be much better than 1702.
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Old 11th March 2003, 10:21 PM   #3
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PCM 1702 is a multi-bit DAC too ! It was the successor to the famous PCM63. If you ask me I would say that PCM63 sounded better than PCM1702. Don't know about the 1704 because it is SMD I don't want to burn my hands on it while I still have the choice
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Old 12th March 2003, 12:31 AM   #4
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Unhappy oupssssss

My mistake. I just had another look on the datasheet.
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Old 13th March 2003, 06:45 AM   #5
A 8 is offline A 8  Sweden
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I used the PCM63K before and recently switced to the 1702K and was actually pretty dissapointed, the 63 had a much fuller and engaging reproduction then the 1702.

I would be great if anyone could share their expereiance of going from the 1702K to the 1704K, perhaps there is no point and I need to consider going back to the 63K
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Old 13th March 2003, 09:26 AM   #6
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If you still have a DAC with PCM63K why build another one ? PCM63K is considered one of the better DAC chips.

Maybe a non OS DAC will fulfill your needs
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Old 13th March 2003, 10:34 AM   #7
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Lightbulb DAC Sound

Quote:
Originally posted by A 8
I used the PCM63K before and recently switced to the 1702K and was actually pretty dissapointed, the 63 had a much fuller and engaging reproduction then the 1702.

I would be great if anyone could share their expereiance of going from the 1702K to the 1704K, perhaps there is no point and I need to consider going back to the 63K

Hi A 8,
Thanks for your post. Thus far I have found NO correlation between the sound of a DACchip and harmonic distortion or any other spec. By trial and error I ended at TDA1543 (NON-OS) after done a lot of chips like CXD2552Q, AD1851, AD1864, AD1865N-J, AD1865N-K, TDA1541AS1.
I have heard the PCM63 in the Treurniet DAC, forgot his brandname (Sorry Pieter) and I agree it is a nice DAC comparable to AD1865 sonically.
Todays trend is for more bits and higher sampling rates. Even with upsampling. After having heard some upsampling DAC's like Musical Fidility and Electrocompaniet at my friends house I can only say: "I am not impressed" Sure these upsamplers have more air in the highs but are also are more fatiguing and less musical to my ears. I also miss the impact of the bass. The latter always a problem when I switch back to LP of the same disc.
[size=huge]What is it that the LP has so much more bass, weight and slamm???[/size]
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Old 13th March 2003, 03:37 PM   #8
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Question Re: DAC Sound

Quote:
Originally posted by Elso Kwak


[size=huge]What is it that the LP has so much more bass, weight and slamm???[/size]

Hi All,
I am not angry , to avoid all misunderstanding. Just a bit disapointed after 12 years of CD-playing. Anyone has a clue???
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Old 14th March 2003, 07:14 PM   #9
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Question Clues. Ideas?

Anyone...? Any clue????
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Old 14th March 2003, 07:35 PM   #10
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Default I do not agree...

...but it do not help you...?

Maybe my Oracle/SME do not give that slam, maybe my RIAA (several of them)...

Or maybe you should try other CD - transports?
Playing Vangelis or Faithless on CD sometimes scares me with the deep & powerful bassnotes, and Santana Supernatural has slam so you blink your eyes!
(Your Clock also helps here!)

Arne K
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