[Articnoise]

  Doesn't change the fact that they both accept 192 or even 384kHz signals. My point was to say they are not limited to the base frequency announced in their datasheet (48kHz for the PCM-63, 96kHz for the PCM1704) and they are guaranteed to do 768kHz. Now that we have the proper interfaces to do 384kHz, they will take it.
 
There's probably no point in doing oversampling past 192kHz input.

 

I have never ever argued that the PMC 1704 can do 192 KHz, 384 kHz or 768 kHz.

 

The discussion, if you missed it, was if the PMC 1704 can do 8x oversampling at 192 KHz or 1536 kHz in NOS. Maybe Kingwa has somehow overclocked the dac chips or it’s actually doing 4x oversampling at 192 KHz or.......

 

BB and TI have stated the PCM 1704 to be able to do 768 kHz and that is in line with how it been used in many DACs. New and old ones!

 

“This is the key specification for the PCM1704. Digital data words are read into the PCM1704 at eight times the standard DVD audio sampling frequency of 96kHz (e.g., 8 x 96kHz = 768kHz) to create a sinewave output of 1100Hz.”

 

http://pdf1.alldatasheet.com/datasheet-pdf/view/524218/TI/PCM1704.html

 

“Chip accepts signals up to 24/96. Both CD-5 and Skylla are equipped with upsampler changing the signal from CD to 24/192. Same thing is done with the signal from digital inputs. The interesting thing is that PCM1704K works up to 96 kHz… But obviously there is a possibility to turn off eightfold oversampling and make him accept higher frequency signal. Anyway we have four chips – two for each channel. Before signal goes to PCM1704K it is transferred via Burr-Brown's SRC4193. Than signal goes to modern, programmable DSP Seiko NPC SM5847 chip that is working as a precise signal strength control. This chip is employed also as digital filter as PCM1704 DACs don't have their own filters.”

 

http://highfidelity.pl/@main-75&lang=en

 

“The DAC itself uses a pair of PCM1704K chips by Burr-Brown, a regular feature in Naim players. But before the data makes it to the DAC itself, the datastream is read into a SHARC DSP that acts as data receiver, filter for out-of-band artefacts and acts as a 40bit, 16x oversampler and a buffer.”….. “The DAC’s big feather in its cap (aside from the uniqueness of it being the first DAC from hitherto DAC-deniers Naim) is it can handle recordings at a sample rate of up to 768kHz and at 32bit resolution.”

 

http://www.audiocounsel.co.uk/wp-content/uploads/2012/07/Hi-Fi-+-Review.pdf

 

Some more in the same line.

 

http://www.digitalaudioreview.net/2011/04/audio-gd-reference-71-dac-8-x-pcm1704uk/

 

http://www.head-fi.org/t/525954/why-do-audio-gds-pcm1704-dacs-only-accept-96-khz-1704-accepts-up-to-800khz

 

[Articnoise]

   
I don't know about the PCM63 (but I would wonder). The problem with these chips is that they don't take an I2S input, but something known as "Right Justified" which I gather is the same data as I2S with a different format. That is likely why nobody has discovered this before (or bothered with it before, I don't know for sure) as in the absence of expensive DSP or FPGA programming, you must use a CS8416 or similar to feed these DACs, as they will output the correct format. 
 
I reckon it'd be great if Kingwa could set up his DSP to accept input up to the highest limit possible. He might have to modify the USB input and whatnot though to accept it though, I'm not sure. Then we could try up-sampling with the latest Audirvana which can output higher frequencies. I'm not sure how it would end up sounding, but it does do wonders with Sabre DACs that accept 384k over USB.

 

If you are referring to the PMC 1704 it’s an I2S chip and I2S has been used in CD-players for many years. It was actually invented to be used for transferring data short distance in a CD player.

 

http://pdf1.alldatasheet.com/datasheet-pdf/view/524218/TI/PCM1704.html

 

[bballas]

Somebody trial this ac choke? cost 40rmb,assembling 5min.
Boulder,dcs,pass use multiple rail, but the idiots ask why why the sq??

 

[bballas]

Put the ac choke in the middle transformer, and post!!!!!

 

[motberg]

NOS models details now at the Audio-GD website..
 
http://www.audio-gd.com/Pro/NOS/NOS7/NOS7EN_Use.htm
 
Anyone here using the Pink Faun HDMI i2S bridge for M7 ???

 

[hugoboss]

i have interest in this new nos master 7.
does anybody know beside pink i2s card, is there another pc card like pink thant can connect to master 7 i2s

 

[comzee]

@motberg
@hugoboss
 
I heard back in the days before Amanero and Di-2014/DI-U8, Pink Faun was the best.
Although, (I apologize I can't link, because I can't find where I read it), I read someone who owned the Pink Faun, and got the Amanero upgrade, preferred the Amanero.
If you wanted I2S specifically, get the DI-U8, most likely better, and many more features as a general off-board.

 

[motberg]

Hi,
 
Thanks for the comments...
 
You may be thinking of the Audio Dandy review where he eventually preferred the Amanero over the PF card, but seems that opinion may have also been OS preference related..
 
I was mentioning the PF card again due to the nice review at Stereo.Net:
http://www.stereo.net.au/forums/index.php/topic/99313-trendy-usb-old-school-i2s/
 
But it seems to me that, even with i2S, there is still great benefit to galvanic isolation and reclocking along the way to the DAC.. and for USB that is somewhat easy using an Intona and possibly following up with a Regen/Recovery (battery or isolated PS) if you like... and seems Uptone Audio may have a one box solution in the works also for USB.
 
Also the relatively short i2S cable length requirement takes some consideration, seems 1M with a very good quality cable is possible with a HDMI cable - but shorter is better and the resultant i2S data integrity has not been evaluated through various lengths.
 
Over at diyaudio, there are some folks on the cutting edge running i2S from Raspberry PI2, and isolating/reclocking on the way to the DAC, but seems very difficult yet and only available to the most capable of the DIY enthusiasts.. I think this is using a non-balanced i2S signal, so cable runs will need be extremely short or built within the DAC itself.
http://www.diyaudio.com/forums/digital-line-level/192465-asynchronous-i2s-fifo-project-ultimate-weapon-fight-jitter-410.html#post4636448

 

[Currawong]

 

   
I don't know about the PCM63 (but I would wonder). The problem with these chips is that they don't take an I2S input, but something known as "Right Justified" which I gather is the same data as I2S with a different format. That is likely why nobody has discovered this before (or bothered with it before, I don't know for sure) as in the absence of expensive DSP or FPGA programming, you must use a CS8416 or similar to feed these DACs, as they will output the correct format. 
 
I reckon it'd be great if Kingwa could set up his DSP to accept input up to the highest limit possible. He might have to modify the USB input and whatnot though to accept it though, I'm not sure. Then we could try up-sampling with the latest Audirvana which can output higher frequencies. I'm not sure how it would end up sounding, but it does do wonders with Sabre DACs that accept 384k over USB.

 

If you are referring to the PMC 1704 it’s an I2S chip and I2S has been used in CD-players for many years. It was actually invented to be used for transferring data short distance in a CD player.

 

http://pdf1.alldatasheet.com/datasheet-pdf/view/524218/TI/PCM1704.html

 
Yup, I had it wrong, it is not I2S though, it is "MSB-First Binary Two’s Complement". See page 7 of the datasheet. The reason I remember this is because I asked Kingwa about installing USB into my NOS1704 and he said it wouldn't work as it requires a chip that outputs this format. 

 

[Articnoise]

   
Yup, I had it wrong, it is not I2S though, it is "MSB-First Binary Two’s Complement". See page 7 of the datasheet. The reason I remember this is because I asked Kingwa about installing USB into my NOS1704 and he said it wouldn't work as it requires a chip that outputs this format. 

 

Kingwa is right you need to send it to and DSP or equivalent to “read it” first. I also believe that a DSP is needed if you for example want to oversample the signal on the PMC 1704. My wording that it is an I2S chip was maybe not 100 % accurate. But if we are really picky the PMC 1704 is not an 8X oversampling dac chip either, it is only one of its features. 

 

 

[mojolo]

  Hi,
 
Thanks for the comments...
 
You may be thinking of the Audio Dandy review where he eventually preferred the Amanero over the PF card, but seems that opinion may have also been OS preference related..
 
I was mentioning the PF card again due to the nice review at Stereo.Net:
http://www.stereo.net.au/forums/index.php/topic/99313-trendy-usb-old-school-i2s/
 
But it seems to me that, even with i2S, there is still great benefit to galvanic isolation and reclocking along the way to the DAC.. and for USB that is somewhat easy using an Intona and possibly following up with a Regen/Recovery (battery or isolated PS) if you like... and seems Uptone Audio may have a one box solution in the works also for USB.
 
Also the relatively short i2S cable length requirement takes some consideration, seems 1M with a very good quality cable is possible with a HDMI cable - but shorter is better and the resultant i2S data integrity has not been evaluated through various lengths.
 
Over at diyaudio, there are some folks on the cutting edge running i2S from Raspberry PI2, and isolating/reclocking on the way to the DAC, but seems very difficult yet and only available to the most capable of the DIY enthusiasts.. I think this is using a non-balanced i2S signal, so cable runs will need be extremely short or built within the DAC itself.
http://www.diyaudio.com/forums/digital-line-level/192465-asynchronous-i2s-fifo-project-ultimate-weapon-fight-jitter-410.html#post4636448

 
There's someone sending i2s to the Master 11 from the combo of Raspberry Pi2 / Hifiberry Dac+ Pro. He did have to remove a couple resistors from the A-gd adapter to get it to work, but it's still easier than what Ianfromcanada and the diyaudio guys are up to.
 
You can read more about his efforts/results here:
 
https://support.hifiberry.com/hc/en-us/community/posts/206528455-RPi-network-to-I2S-transport-using-DIGI-as-I2S-bus-controller
https://support.hifiberry.com/hc/en-us/community/posts/201496242-DAC-Pro-clocks?page=2#comments
http://www.audioasylum.com/cgi/vt.mpl?f=pcaudio&m=156122
 
I think he's using the RJ45 input for now but plans to try HDMI in the future. He goes by Bob/beautox.
 
I was thinking about contacting him but then came upon the Sonore microrendu, which is a purpose-built network audio renderer with USB output. The board is designed to overcome the deficiencies of typical consumer hardware (Mac, PC, RPi2, BBB, Cubox, etc) and of the typical USB implementation. According to the designer, John Swenson (who also designed the Uptone Regen), it sounds as good or better than the i2s implementations he's tried. i2s isn't easy to get right either so my money's on the microrendu's USB topping the Dac+ Pro's i2s.

 

[hugoboss]

hi to all master 7 owner, i want to ask about hdmi i2s connection.
it seem like the best connection is hdmi i2s
so i want to ask all master 7 owner, have you ever tried a device like this hdmi splitter?
 

 

 
 
 
so i plan to use my pc hdmi output (from my vga nvidia 980gtx. nvidia vga support audio video passthrough bitstream) to coonect to that spliter, then hdmi out 1 to my lcd, hdmi out 2 to audiogd master 7 hdmi i2s input
will this work?
 
thanks alot before
 
 
i have tried to connect to av receiver amplifier and it work , but never connect the hdmi output to any dac , i dont have any hdmi input dac yet

 

[seaice]

Does the splitter support I2S output? And is it Audio-GD I2S compliant?

 

[hugoboss]

the splitter not mentioning anything about i2s it only said deliver dts-hd dolby true-hd audio , 4k video

 

[Articnoise]

  hi to all master 7 owner, i want to ask about hdmi i2s connection.
it seem like the best connection is hdmi i2s
so i want to ask all master 7 owner, have you ever tried a device like this hdmi splitter?
 
 
so i plan to use my pc hdmi output (from my vga nvidia 980gtx. nvidia vga support audio video passthrough bitstream) to coonect to that spliter, then hdmi out 1 to my lcd, hdmi out 2 to audiogd master 7 hdmi i2s input
will this work?
 
thanks alot before
 
 
i have tried to connect to av receiver amplifier and it work , but never connect the hdmi output to any dac , i dont have any hdmi input dac yet

 

Master 7 cannot take a HDMI video signal, only some HDMI audio that has the right pin out.

 

Read post #1541 Scott explain why there.