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  1. DACLadder

    Audio-GD DI-20

    @Zachik No, haven’t tried the Gustard U18 but a friend has and says he likes (sound qualty) the DI20HE better. Have not used the newer Singxer SU-2 either.
  2. DACLadder

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

    Used an Iggy v1 exclusively for 6 months in 2015/16. It was a weird beast in that it took days to warm up so you had to power up 24/7. After a long break-in period, the Iggy v1 was dry and lean compared to the richer sounding M7. The Iggy had great vocals and less colored but didn’t move my...
  3. DACLadder

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

    @sajunky Thanks for your insight. Have you heard the Holo May? Chord Dave? Just wondering how sound would compare to Kingwa’s latest offerings? Same with Denafrips. Most reviews I’ve read are several years old.
  4. DACLadder

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

    The PCM1704 DACs from Kingwa are PCM only. No conversion from DSD is possible by the DAC. You get no sound playing DSD files. Later A-GD DAC models with R2R capable modules will decode DSD from discreet circuits. Not the PCM ladders like some other manf offer. I think Holo May will convert...
  5. DACLadder

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

    I have the HE7 mk2. Remarkable sounding in the modern DAC universe. Not dark, mysterious, or tubby like the old, warmer gen 1 M7. In comparison the HE7 mk2 is crisp, clean, balanced, and dynamic. And has more detail when compared recently to newer pcm1704uk models - M7S 2017 and S7 2020...
  6. DACLadder

    Audio-GD DI-20

    Should be OK to leave the Blaster connected on the target side. I have for days testing f/w. But would turn DAC/DI power off before connecting/ disconecting the USB side with 10-pin cable connected.. See ”Hardware Setup” on pags 1-2, 1-3 for proper method of connecting the Blaster for use...
  7. DACLadder

    Audio-GD DI-20

    The Quartus s/w is not seeing the target Altera device on the 10-pin ribbon cable. Make sure the DI-20 is powered up before attempting. Also verify the DI-20 rear panel 10-pin header connector does not have have any visibly bent pins. Those are the easy checks. There is also an internal cable...
  8. DACLadder

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

    @limberpine. The display and input switching are done by a microcontroller on the display board. I'm sure your have but try power cycling leaving the unit off for a full 30 seconds.
  9. DACLadder

    New Audio-gd R-7, R-7HE R-8, R-27, R-27HE, R-28 Flagship Resistor Ladder DACs and DAC/amps

    Single ended is not inferior to balanced as far as sound quality. Kingwa explained to me on the old Master 7 that the analog channels are balanced until the output driver stage where the two channels of D/A are summed at the output driver stage. The output driver stage then forms the (+) and...
  10. DACLadder

    New Audio-gd R-7, R-7HE R-8, R-27, R-27HE, R-28 Flagship Resistor Ladder DACs and DAC/amps

    The MK2 DACs (R7 and HE7) have so much resolution that cable swaps are readily noticed. Even though HDMI I2S is asynchronous cable changes are heard. Can't explain why but is reality. On HDMI cables I would start at the bottom end price range and work my way up the ladder. Some fancier...
  11. DACLadder

    New Audio-gd R-7, R-7HE R-8, R-27, R-27HE, R-28 Flagship Resistor Ladder DACs and DAC/amps

    The only Opamps Kingwa uses are for DC offset control (servo) in the analog stages. They are not in the direct signal path. Kingwa said the Opamps have better precision versus building the circuits out of discreet parts.
  12. DACLadder

    New Audio-gd R-7, R-7HE R-8, R-27, R-27HE, R-28 Flagship Resistor Ladder DACs and DAC/amps

    The R8 MK2 does not employ switching power. The digital board has two large linear regulators feeding DC to nine chip type linear regulators for the circuits. Analog circuits have 4 Class A regulators. Class A is just another term for linear, always conducting power. You could argue the HE...
  13. DACLadder

    New Audio-gd R-7, R-7HE R-8, R-27, R-27HE, R-28 Flagship Resistor Ladder DACs and DAC/amps

    Kingwa has announced a new product variation. The R-8HE MK2. http://www.audio-gd.com/HE/R8HEMK2/R8HE_MK2EN.htm
  14. DACLadder

    New Audio-gd R-7, R-7HE R-8, R-27, R-27HE, R-28 Flagship Resistor Ladder DACs and DAC/amps

    @arayasg For PLL_N the R7 2020 upgrade guide says you also need to update the Xilinx CPLD as well as the Altera FPGA. The 'FF’ on the front panel 2nd page are just reserved, place holder functions at the time your R7 shipped. They are still reserved (no function) in the 2020 PLL_N f/w.
  15. DACLadder

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

    The SU-2 I2S should sound better than the Amanero. From experience the SU-1 and SU-6 both sound better.
  16. DACLadder

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

    If you are truly running V7 firmware then you have the original Master 7 digital board (1 XO)- not Singularity (two XOs), In that case I2S will definitely sound better using a good I2S source. The old design uses I2S clocks directly instead of relying on the single XO PLL as with SPDIF You...
  17. DACLadder

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

    @PiNa.cz These old DACs seem to sound better using I2S so yes may be worth a try with the SU-2.
  18. DACLadder

    New Audio-gd R-7, R-7HE R-8, R-27, R-27HE, R-28 Flagship Resistor Ladder DACs and DAC/amps

    Do any of these quantum tweaks ever make sound worse? I usually see reports of miraculous improvement. Seems like the spin influence could go either way. Either help or make things worse depending on a lot of factors especially where and how they are installed. Also a third option of no...
  19. DACLadder

    New Audio-gd R-7, R-7HE R-8, R-27, R-27HE, R-28 Flagship Resistor Ladder DACs and DAC/amps

    @mivarpet Oh yes, the R7 mk2 conversion retains the original R7 analog boards but with updated V2 DAC modules. Good job. I am loving the Nichicon cap change on my original M7 analog boards. Thank you again! M7 analog board with blue Nichicon KA caps. A powered suction desoldering tool...
  20. DACLadder

    New Audio-gd R-7, R-7HE R-8, R-27, R-27HE, R-28 Flagship Resistor Ladder DACs and DAC/amps

    @mivarpet Nice job! And makes plenty sense as an oscillator is simply a mechanical system. What feet are you using on the R7 mk2 .. the stock feet? Michael (mivarpet) has done a lot of modding. Taking Currawong's original R7 2017 and converting to R7 MK2. Plus a lot of cap changes on...
  21. DACLadder

    New Audio-gd R-7, R-7HE R-8, R-27, R-27HE, R-28 Flagship Resistor Ladder DACs and DAC/amps

    Litz wiring is just simply using many smaller insulated conductors versus a single larger conductor wire. This will minimize 'skin effect'. https://en.wikipedia.org/wiki/Litz_wire 'Skin effect' is the property of AC signals in a wire where as frequency increases the current density narrows...
  22. DACLadder

    New Audio-gd R-7, R-7HE R-8, R-27, R-27HE, R-28 Flagship Resistor Ladder DACs and DAC/amps

    ACSS wires all sound differently especially with a revealing MK2 DAC. Try them all. The Nimak 5 is great DAC to M10 amp. Took some burn in to sound its best and disappear. After studying ACSS (and Krell CAST) it makes sense to me to use the best cable for the job. The ACSS analog system is...
  23. DACLadder

    New Audio-gd R-7, R-7HE R-8, R-27, R-27HE, R-28 Flagship Resistor Ladder DACs and DAC/amps

    The R8’s ext. 10M input impedance is 75 ohm. Design decision to keep costs low. No mods. From R8 mk2 summary page… If user want the R8 MK2 work with the external clock input , can update the firmware , the IN2 BNC input become the external 10MHz input. Download the R-8 EC firmware in the...
  24. DACLadder

    New Audio-gd R-7, R-7HE R-8, R-27, R-27HE, R-28 Flagship Resistor Ladder DACs and DAC/amps

    The R7 MK2 I2S Xilinx file posted above is not correct. So I copied my working R7 MK2 I2S Xilinx code to a jedec file. You only need to program the I2S Xilinx if you screw up and misprogram the wrong Xilinx during PLL_N upgrade on the R7 MK2s. The R7 MK2 I2S Xilinx file name is...
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