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Audio-Gd Master 7 - Discrete Fully Balanced DAC (PCM1704) - Page 63

post #931 of 2058
Quote:
Originally Posted by ALRAINBOW View Post

I will for sure. I hope in all of this I better hear a difference as I do with the AP1 and PP . That makes a difference for sure. But not so much wth the M7 though.
Al D

Was that a comparison between the AP and the USB32 or a comparison between the AP and another transport on the same input?
Edited by ciphercomplete - 11/4/13 at 7:38am
post #932 of 2058
Quote:
Originally Posted by DACLadder View Post
 

I have both connected.  With S/PDIF input #3 you can really tell a difference compared to I2S.   Input #3 is warmer sounding with a narrower stage, fuzzier imaging, and less bass.  S/PDIF input #1 sounds closer to the I2S input tonally but there seems to be more detail/ clarity with I2S.  One man's clarity is another's clinical sound but time is improving the 2-week old OR5.  I2S wins the vocal rendition award - more natural with nice breath across the lips. Unnatural sibilance is virtually absent with I2S.

 

To be fair I don't have the OR5 S/PDIF Hynes power option but do have the Hynes for the I2S circuits.

 

Your observations agree with mine.  Input 1 is clearly superior to the USB input and other spdif inputs.  The spdif inputs and the USB input all sound the same to me.  Compared to the BNC input they are slightly fuzzy and have a slightly smaller soundstage.  The BNC input has superior imaging and the high frequencies seem to float in space with a very clear quality to them whereas the other inputs sound duller and flatter.  This really hit me over the past few days of listening and I have been scrapping the funds together for either a AP to use on input 1 or a OR5.       

Edited by ciphercomplete - 11/4/13 at 8:59am
post #933 of 2058

DP


Edited by ciphercomplete - 11/4/13 at 8:38am
post #934 of 2058
Quote:

Was that a comparison between the AP and the USB32 or a comparison between the AP and another transport on the same input?

Comments deleted as I initially thought the post was directed toward me....


Edited by DACLadder - 11/7/13 at 7:50am
post #935 of 2058

Hi everyone!!

 

Has anyone tried to install amanero usb card or diyinhk usb-i2s card into Master 7???  I think that it would be possible in I2S-Rj45 input or USB input, if either pcb is removed. I2S pins of amanero/diyinhk can be direcly connected to Master7 pins . GND pin should be connected to every GND pin in amanero or diyinhk. Would it be possible?? what do you think??

post #936 of 2058

Hi again,

 

I have mailed to Kingwa and it would only be necessary to wire one GND pin next to 3.3V. In fact, Kingwa has tested this setup and work despite he don not recommend Amanero in front of VIA Envy. According to Kingwa it has a higher SQ. He knows what hi is talking about, obviously, but VIA is not possible in my setup!.

 

Kind regards,

post #937 of 2058

Has anyone tried http://jlsounds.com/i2soverusb.html? It seems to be a good solution, it includes output galvanic isolation, dual external psu possibility (USB / reclocking), external clock, ....It is also 3.3V and specs include connection diagram to a PCM1704 based DAC. I think it could be used in I2S M7 port.....

post #938 of 2058
Quote:

 I think it could be used in I2S M7 port.....

Could you ask Kingwa what is the pinout of the internal ribbon cable headers on the Master 7 DSP board?   Looking at the Master 7 gut shot they appear to be 5-pin connectors (by counting five wires).  I say "they" because external I2S and USB cables from the backplate appear to be the same.   So if power and ground are provided on the cable that means only three of the four I2S signals are used.  Perhaps I am missing something from the pictures.  thanks!

post #939 of 2058
Quote:
Originally Posted by jmmbarco View Post
 

Has anyone tried http://jlsounds.com/i2soverusb.html? It seems to be a good solution, it includes output galvanic isolation, dual external psu possibility (USB / reclocking), external clock, ....It is also 3.3V and specs include connection diagram to a PCM1704 based DAC. I think it could be used in I2S M7 port.....

Looks interesting.  I'd be willing to try it since it is so cheap.

post #940 of 2058

Hi! The 5 cables in M7 board are the four I2S signals + GND and it is the same in the USB32 output (USB to I2S). Power and GND of USB32 are the two other cables that can be seen in the photographs. In fact I think that there are two more pins to eventually feed another pcb. In my case, as I want to use jlsounds card i will pick power from M7 motherboard and I will connect the output to the I2S port uin M7 motherboard as well. In this case there 7 wires but two of them are GND (M7). In my opinion seems a good solution as M7 feeds isolation and reclocking so GND is the same!

I have asked Lyuben about compatibility as well, and he states that if Amanero is compatible (Kingwa says it is, even he does not recommend it) his pcb is 100% compatible too.

What do you think guys???

 

Yes it is quite cheap. It is a very interesting devices, in fact Ciunas dac uses a similar approach, amanero+isolation+reclocking.....

 

Kind regards,

JM

post #941 of 2058

I'd be more interested in using it to build a separate box with I2S output then I would in reconfiguring the M7. 

post #942 of 2058

Hi,

 

It was also my first idea but if you install it inside the M7 you save so many connections and cable length is much shorter. If you use single ended signals it is not recommended to use more than 10cm cable so you could use differential mode to avoid this limitation. Check twisted pear audio transporter to do the conversion http://www.twistedpearaudio.com/digital/teleporter.aspx . if you use a separate board you could also work in buffering and so on.....

 

kind regards,

JM

post #943 of 2058
I'm very interested to see how this may work out. I just recently got the SA-2, which has all the same digital input, new DSP version, etc as the M7. I'm currently running it with AP2+PP. Anything that may improve flexibility /connectivity /performance is of great interest.

It seems to me that the SQ difference between USB32 and AP2 is less on this new unit than on my old audio-gd DAC (SA-1.32). Anybody else have similar impressions? I wonder the difference may be the latest DSP version or more advanced power supplies?

However I still have issues with the USB32 driver/software. sometimes it works, lots of times it just stops playing, or clicks after track changes. Regardless of buffer setting, etc.
post #944 of 2058

I have a AP1+PP due to arrive in a little more than week from now so you can bet I will be comparing it to the USB32 immediately.  I have had no playback issues with the USB32 since I upgraded the firmware a couple of months ago.

post #945 of 2058
Quote:

The 5 cables in M7 board are the four I2S signals + GND and it is the same in the USB32 output (USB to I2S). Power and GND of USB32 are the two other cables that can be seen in the photographs.

Makes sense and thank you for the information.

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