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

Discussion in 'High-end Audio Forum' started by darknightdk, Sep 3, 2012.
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  1. FredA
    If i remember correctly, a jumper is needed on bypass. Otherwise, you bypass the dsp. It's reversed logic. Bypassing the dsp would cause a roll-off.
  2. DACLadder
    Let's back up on your issue... do you have the original M7 (not SIngularity DSP version)?
  3. Alireza326
    I did not upgrade M7 digital board to S7 , only firmware is updated,
    I doesn't notice cold or warmed DAC start issue, probably due to that doesn't know this problem exists till now
    but I experienced problem from cold start and only one time M7 response Match NFB28 in high frequency region ( in rest of frequency spectrum curves match perfectly)
  4. DACLadder
    The original M7 DSP had bypass jumper engaged as default. This bypasses the PLL as default. Removing the jumper engages the PLL.

    And you are making measurements with a microphone? If so try with either left or right channel only. Could be phase shifts when playing both channels together that cause measured attenuation. So try left or right channel only as a test.
  5. Alireza326
    original M7 dsp board
  6. Alireza326
    yes, I use UMM6 with REW software and introduce calibration file of mic to REW, then unplug right speaker and measurements done on mono mode of left speaker
    I will upload measurement files as soon as I have access to measurement files
    speaker components are Oris150 horn with tangband full range and bd15 as bass driver
    I also test with another speaker with tweeter and problem exists
    thanks for your help
    Last edited: Sep 27, 2018
  7. aljordan
    That graph is .1 dB increments. so it rolls off about 0.3 dB.
  8. Mahdi8
    Do you really need HDMI? you can make a custom I2S RJ45 to connect those 2 device easily. But if you need to make custom HDMI Cable it would be possible also with custom wiring it would be quite easy to do by your local electrician/local cable company
    seaice likes this.
  9. seaice
    Thanks but unfortunately yes. I would like to use the Chord Hugo M Scaler as a source for my HE-7 Singularity. HDMI I2S or USB are the only options for rates higher than 192kHz:

    1) M Scaler has only optical and BNC outs: https://chordelectronics.co.uk/product/hugo-mscaler/
    2) I would like to use as much TAPS of M Scaler as possible, e.g. 352.8kHz or 384kHz output of M Scaler.
    3) The only inputs of HE-7 Singularity receiving 352.8kHz or 384kHz are HDMI I2S and USB. (For 192KHz and below I can use a direct BNC connection MScaler--HE-7Singularity)

    So the question is how to convert 352.8kHz or 384kHz BNC out of M Scaler to 352.8kHz or 384kHz HDMI I2S in HE-7 Singularity.

    BTW: My HE-7 Singularity does not have RJ45 I2S. It has just HDMI-I2S plus other inputs with the following limitations:
    1x BNC 24bits 192kHz
    1x AES 24-bit 192kHz
    1x RCA Coaxial 24bits 96kHz
    1x Optical 24bits 96kHz
    1x HDMI I2S 32bits 384kHz
    1x USB 32bits 384kHz
    Last edited: Sep 27, 2018
  10. FredA
    Last edited: Sep 28, 2018
    seaice likes this.
  11. seaice
    Many thanks Mahdi8 and FredA. For 192kHz I can use a direct BNC connection. I need a similar device but with SPDIF in supporting 352.8kHz or higher rates.
  12. DACLadder
    Hello seaice! The HDMI I2S signalling is not compatible with AGD inputs. It is like the Gustard U12 where resulting absolute audio phase is 180 deg. plus L- R channels are swapped.
    seaice likes this.
  13. DACLadder
    You are correct! That though is amazingly flat response with speakers. Most setups could not match.
  14. aljordan
    Not through speakers. I run room correction, but it doesn't work that well!
  15. Alireza326
    NFB28 VS M7.jpg Master 7 OK.jpg
    hi again
    measurements for NFB28 (green line) and Master 7 (red line) is attached
    so as you see M7 response fall at 14khz about 40db
    as a chance, one measurement of M7 lead to response similar to NFB28 ( I attach its graph as Master7 OK)
    so what do you think? I think a strange things happens and don't have any idea what is going on
    any information could be helpful
    Last edited: Sep 28, 2018
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