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Is there a better filter then DF1704
Is there a better filter then DF1704
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Old 28th May 2015, 02:59 PM   #1
sumotan is offline sumotan  Indonesia
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Default Is there a better filter then DF1704

Hi Guys,

Have a Sonic Frontier SFD 2 dac board which am finally going to resurrect.
The input receiver is dead. Original idea was to run I2S to bypass the input
receiver all together. Currently the filter is a NPC 5803 apt. I'm aware that
a German company that sells an adapter board for this conversion with the DF1704. From data it seems that the DF 1704 is able to receive I2S signals
right, so this would solve one of the headaches. The other is since I'm going through so much hassle to resurrect the dac , are there better digital filters out there ? Thanks in advance guys. I know it's an oldie but it's a good one which is
such a waste if I just leave it aside
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Old 28th May 2015, 07:03 PM   #2
stephensank is offline stephensank  United States
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In my rather extensive a/b listening testing on this subject, the NPC SM5847 is just as good, but not better. Haven't heard a better DF yet than either, although I have not tested against the DF1706, but I seriously doubt there's any audible difference to be had there.
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Old 29th May 2015, 12:48 AM   #3
abraxalito is online now abraxalito  United Kingdom
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Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though...
A better digital filter is none, IME. Does the SFD-2 have UltraAnalog DAC modules?
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Old 29th May 2015, 01:24 AM   #4
sumotan is offline sumotan  Indonesia
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Thanks Stephen.
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Old 29th May 2015, 01:25 AM   #5
sumotan is offline sumotan  Indonesia
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Yes Abraxalito, 2 Ultra Analog dac in balance mode
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Old 29th May 2015, 10:04 PM   #6
elektroj is offline elektroj  Europe
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Jaffrie,
Sound-wise SM5803 is only so-so. DF1704, in contrast, is fine filter, but it won't work with UltraAnalog modules without some additional glue logic. UA DACs need filters that have 'De-glitch' output.
Three candidates that come to mind are SM5842, SM5847 and PMD100.
(I know the DF1704 quite well, I've fitted it to many different CD players/DACs over the last 10+ years. In fact, everything that the German 'company' you've mentioned was/is selling was designed/manufactured by me. All the later versions by him are reverse engineered knock-offs of mine, so I can't say whether they will work as expected or not..)
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Old 25th September 2015, 09:10 AM   #7
hollowman is offline hollowman  United States
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The DF1704 is very good. TI/BB created it at the same time they created the "companion" PCM1704 multi-bit DAC; strangely, the PCM1704 has a built-in DF. In the datasheet, they still recommend the add-on DF1704 (for use with PCM1704) for optimal results.

" Is there a better filter then [sic!] DF1704"?
Well, from the same era, probably PMD100 or PMD200. Though I've found that if you supply DF chips with really clean, well-reg'd power, with heavy near-chip decoupling ...these techniques alone are more important than chip manuf./model. My much-modded Magnavox CD-650 still remains my reference for digital playback ... i.e., despite its ancient chipset: TDA1541A (single) and SAA7220/B.
A diy superclean+tight external PSU is one reason for good sonics.

Or you could go custom DSP (ala Wadia, Theta). You do know your math and how to code, don't ya?

Last edited by hollowman; 25th September 2015 at 09:24 AM.
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Old 24th November 2020, 01:34 AM   #8
naimless is offline naimless  Malaysia
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Quote:
Originally Posted by elektroj View Post
Jaffrie,
Sound-wise SM5803 is only so-so. DF1704, in contrast, is fine filter, but it won't work with UltraAnalog modules without some additional glue logic. UA DACs need filters that have 'De-glitch' output.
Three candidates that come to mind are SM5842, SM5847 and PMD100.
(I know the DF1704 quite well, I've fitted it to many different CD players/DACs over the last 10+ years. In fact, everything that the German 'company' you've mentioned was/is selling was designed/manufactured by me. All the later versions by him are reverse engineered knock-offs of mine, so I can't say whether they will work as expected or not..)
Hi Electroj,

I need your opinion on digital filter, I currently have a STAX Talent DAC, and wondering any compatible Digital Filter you could recommend for direct replacement to upgrade the SM5803?

Appreciate your assistance. Thank you.

Naimless
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Old 27th November 2020, 12:58 AM   #9
canvas is offline canvas  Taiwan
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Quote:
Originally Posted by hollowman View Post
strangely, the PCM1704 has a built-in DF
Well, I didn't see that in the datasheet. If it has DF inside, it will need extra clock or PLL circuit.

Poting
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Old 27th November 2020, 02:57 AM   #10
abraxalito is online now abraxalito  United Kingdom
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Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though...
Quote:
Originally Posted by canvas View Post
Well, I didn't see that in the datasheet.
That would be because it isn't there .

Anyone here have any interest in a 'soft' digital filter using a CPU? Nowdays signal processing has become so much more affordable and lower power. Take these chips for example from ST - https://www.st.com/content/st_com/en...h7-series.html

STM32H730 looks to be a good choice, and under $5 in quantity. I'm fairly sure it can be coaxed into making a better digital filter than anything off-the-shelf.
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