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Thread: Justin & Jerry's Hifi Blog

  1. #2141
    Join Date: Aug 2009

    Location: Staffordshire, England

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    I'm Martin.

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    I think Jez was explaining earlier that there shouldn't be any impedance issues to sort.
    Current Lash Up:

    TEAC VRDS 701T > Sony TAE1000ESD > Krell KSA50S > JM Labs Focal Electra 926.

  2. #2142
    Join Date: Oct 2012

    Location: NE England

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    Quote Originally Posted by Macca View Post
    You wouldn't care to have punt at what is going on technically?

    Is this a band aid for a flawed system> Is it benign distortion? Are there unknown impedance issues being sorted? I appreciate it would be shots in the dark.
    I believe I've already said maybe 3 times that I think the most likely reason I got a subjective improvement is that my prototype power amp probably likes to see a low impedance at it's input. I have no other explanation and would not want to speculate.

    Generally speaking there is no reason why a buffer should improve anything unless you are driving very long interconnects like 10M long or maybe 30M long from a passive pre or other high ish output impedance source, In which case a buffer will prevent the loss of treble.
    Arkless Electronics-Engineered to be better. Tel. 01670 530674 (after 1pm)

    Modded Thorens TD150, Audio Technica AT-1005 MkII, Technics EPC-300MC, Arkless Hybrid MC phono stage, Arkless passive pre, Arkless 50WPC Class A SS power amp, (or) Arkless modded Leak Stereo 20, Modded Kef Reference 105/3's
    ReVox PR99, Studer B62, Ferrograph Series 7, Tandberg TCD440, Hitachi FT-5500MkI, also FT-5500MkII
    Digital: Yamaha CDR-HD1500 (Digital Swiss army knife-CD recorder, player, hard drive, DAC and ADC in one), PC files via 24/96 sound card and SPDIF, modded Philips CD850, modded Philips CD104, modded DPA Little Bit DAC. Sennheiser HD580 cans with Arkless Headphone amp.
    Cables- free interconnects that come with CD players, mains leads from B&Q, dead kettles etc, extension leads from Tesco

  3. #2143
    Join Date: Oct 2012

    Location: NE England

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    Quote Originally Posted by Yomanze View Post
    As your DAC will have a passive output I think the buffer will be bringing a lot to the party, also think it will work well with a passive pre...
    It will have an active low impedance output which does not require a buffer.
    Arkless Electronics-Engineered to be better. Tel. 01670 530674 (after 1pm)

    Modded Thorens TD150, Audio Technica AT-1005 MkII, Technics EPC-300MC, Arkless Hybrid MC phono stage, Arkless passive pre, Arkless 50WPC Class A SS power amp, (or) Arkless modded Leak Stereo 20, Modded Kef Reference 105/3's
    ReVox PR99, Studer B62, Ferrograph Series 7, Tandberg TCD440, Hitachi FT-5500MkI, also FT-5500MkII
    Digital: Yamaha CDR-HD1500 (Digital Swiss army knife-CD recorder, player, hard drive, DAC and ADC in one), PC files via 24/96 sound card and SPDIF, modded Philips CD850, modded Philips CD104, modded DPA Little Bit DAC. Sennheiser HD580 cans with Arkless Headphone amp.
    Cables- free interconnects that come with CD players, mains leads from B&Q, dead kettles etc, extension leads from Tesco

  4. #2144
    Join Date: Apr 2008

    Location: Warrington

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    I'm Neil.

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    Quote Originally Posted by Arkless Electronics View Post
    It will have an active low impedance output which does not require a buffer.
    If Jerry is using his TDA1543 DAC this one uses passive resistor-based I/V & no active stage.
    Mana Acoustics Racks / Bright Star IsoNodes Decoupling >> Allo DigiOne Player >> Pedja Rogic's Audial Model S DAC + Pioneer PL-71 turntable / Vista Audio phono-1 mk II / Denon PCL-5 headshell / Reson Reca >> LFD DLS >> LFD PA2M (SE) >> Royd RR3s.

  5. #2145
    Join Date: Oct 2012

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    Quote Originally Posted by Yomanze View Post
    If Jerry is using his TDA1543 DAC this one uses passive resistor-based I/V & no active stage.
    I have better things to do than start researching this but it is very unlikely that it has a passive output.
    Arkless Electronics-Engineered to be better. Tel. 01670 530674 (after 1pm)

    Modded Thorens TD150, Audio Technica AT-1005 MkII, Technics EPC-300MC, Arkless Hybrid MC phono stage, Arkless passive pre, Arkless 50WPC Class A SS power amp, (or) Arkless modded Leak Stereo 20, Modded Kef Reference 105/3's
    ReVox PR99, Studer B62, Ferrograph Series 7, Tandberg TCD440, Hitachi FT-5500MkI, also FT-5500MkII
    Digital: Yamaha CDR-HD1500 (Digital Swiss army knife-CD recorder, player, hard drive, DAC and ADC in one), PC files via 24/96 sound card and SPDIF, modded Philips CD850, modded Philips CD104, modded DPA Little Bit DAC. Sennheiser HD580 cans with Arkless Headphone amp.
    Cables- free interconnects that come with CD players, mains leads from B&Q, dead kettles etc, extension leads from Tesco

  6. #2146
    Join Date: Apr 2008

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    Quote Originally Posted by Arkless Electronics View Post
    I have better things to do than start researching this but it is very unlikely that it has a passive output.
    It's a current-output DAC, and one of the only ones that can be driven directly from an I/V resistor, usually by jacking the voltage up to 8V to get the desired 2V output. Lots of TDA1543 DACs are built in this way.
    Mana Acoustics Racks / Bright Star IsoNodes Decoupling >> Allo DigiOne Player >> Pedja Rogic's Audial Model S DAC + Pioneer PL-71 turntable / Vista Audio phono-1 mk II / Denon PCL-5 headshell / Reson Reca >> LFD DLS >> LFD PA2M (SE) >> Royd RR3s.

  7. #2147
    Join Date: Oct 2012

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    Nearly all DACs are current output. Hence the I/V op amp stage universally used. I'm afraid it's not a topic that interests me....
    Arkless Electronics-Engineered to be better. Tel. 01670 530674 (after 1pm)

    Modded Thorens TD150, Audio Technica AT-1005 MkII, Technics EPC-300MC, Arkless Hybrid MC phono stage, Arkless passive pre, Arkless 50WPC Class A SS power amp, (or) Arkless modded Leak Stereo 20, Modded Kef Reference 105/3's
    ReVox PR99, Studer B62, Ferrograph Series 7, Tandberg TCD440, Hitachi FT-5500MkI, also FT-5500MkII
    Digital: Yamaha CDR-HD1500 (Digital Swiss army knife-CD recorder, player, hard drive, DAC and ADC in one), PC files via 24/96 sound card and SPDIF, modded Philips CD850, modded Philips CD104, modded DPA Little Bit DAC. Sennheiser HD580 cans with Arkless Headphone amp.
    Cables- free interconnects that come with CD players, mains leads from B&Q, dead kettles etc, extension leads from Tesco

  8. #2148
    RothwellAudio Guest

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    Quote Originally Posted by Arkless Electronics View Post
    I think the most likely reason I got a subjective improvement is that my prototype power amp probably likes to see a low impedance at it's input.
    Yes, I was reading something recently where the author talked about a lower impedance drive to a power amp producing lower distortion. It might have been in one of Douglas Self's books but I can't say for sure and I can't remember the details. I'll come back if I remember.

  9. #2149
    Join Date: Oct 2012

    Location: NE England

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    Quote Originally Posted by RothwellAudio View Post
    Yes, I was reading something recently where the author talked about a lower impedance drive to a power amp producing lower distortion. It might have been in one of Douglas Self's books but I can't say for sure and I can't remember the details. I'll come back if I remember.
    Improved stability margin and/or greater immunity to RF incursion my guess.
    Arkless Electronics-Engineered to be better. Tel. 01670 530674 (after 1pm)

    Modded Thorens TD150, Audio Technica AT-1005 MkII, Technics EPC-300MC, Arkless Hybrid MC phono stage, Arkless passive pre, Arkless 50WPC Class A SS power amp, (or) Arkless modded Leak Stereo 20, Modded Kef Reference 105/3's
    ReVox PR99, Studer B62, Ferrograph Series 7, Tandberg TCD440, Hitachi FT-5500MkI, also FT-5500MkII
    Digital: Yamaha CDR-HD1500 (Digital Swiss army knife-CD recorder, player, hard drive, DAC and ADC in one), PC files via 24/96 sound card and SPDIF, modded Philips CD850, modded Philips CD104, modded DPA Little Bit DAC. Sennheiser HD580 cans with Arkless Headphone amp.
    Cables- free interconnects that come with CD players, mains leads from B&Q, dead kettles etc, extension leads from Tesco

  10. #2150
    Join Date: Apr 2008

    Location: Warrington

    Posts: 3,451
    I'm Neil.

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    Quote Originally Posted by Arkless Electronics View Post
    Nearly all DACs are current output. Hence the I/V op amp stage universally used. I'm afraid it's not a topic that interests me....
    Obviously not considering that most modern DACs have a voltage output. The opamps are used as gain stages or buffers rather than for I/V conversion. Of course vintage players are different, at a time they were all current output...
    Mana Acoustics Racks / Bright Star IsoNodes Decoupling >> Allo DigiOne Player >> Pedja Rogic's Audial Model S DAC + Pioneer PL-71 turntable / Vista Audio phono-1 mk II / Denon PCL-5 headshell / Reson Reca >> LFD DLS >> LFD PA2M (SE) >> Royd RR3s.

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