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Audio Diffmaker

Discussion in 'Hi Fi Systems & Separates' started by Tone-uk, Dec 12, 2010.

  1. Tone-uk

    Tone-uk Member

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    Just thought I'd post a link to this software which may be useful to those who wish to test for audible effects of

    changing interconnects
    changing speaker cables
    "special" power cords
    vibration control
    different kinds of cd players
    different power amps

    etc etc

    Audio DiffMaker

    Link also provides an AES paper and slide show.

    Best Regards
    • Thanks Thanks x 1
    Last edited: Dec 12, 2010
  2. formbypc

    formbypc Member

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    This doesn't test for 'audible effects', though - it tests for differentials based on the capabilities, design and limitations of this software.
  3. Mr Pig

    Mr Pig Active Member

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    And the capabilities of the soundcard, microphone and PC. So do you think the sound card in your PC is capable of picking up the, often subtle, changes in hi-performance Hi-Fi system? Is it not like trying to tell a fake oil painting from a real one with only distant pictures taken with a 1MP camera to go by?
  4. Autopilot

    Autopilot Active Member

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    You need to go and read up more on this software then, as you dont understand how it works. It's a serious bit of kit used by many professionals and it works amazingly well.
    • Thanks Thanks x 1
  5. Mr Pig

    Mr Pig Active Member

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    I don't, that is true, but it does work on the signal translated through the computer sound card, yes?

    And if you wanted to test speaker cables, power amps etc it would also have to rely on a microphone on top of that, yes?
    Last edited: Dec 12, 2010
  6. Alan Mac

    Alan Mac Member

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    No, a microphone is not required.


    Alan
  7. Alan Mac

    Alan Mac Member

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    I have tried out the Audio DiffMaker software using a couple of the “dyf” files containing an excerpt from the musical “CHESS” (I think).

    Comparing The power amplifier “Home theater moderate cost 100 W monophonic amplifier" with its input signal, it required a total boost of about 40 dB for the difference signal to be roughly the same loudness as the reference track.

    Comparing The power amplifier “Hafler DH200" with its input signal, it required a total boost of about 70 dB for the difference signal to be roughly the same loudness as the reference track.


    Alan
    Last edited: Dec 13, 2010
  8. Mr Pig

    Mr Pig Active Member

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    How do you test differences in speaker cables and power amps without a microphone to record the sound?
  9. Alan Mac

    Alan Mac Member

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    The sound has already been recorded.

    Do you require a microphone to play back LPs or CDs etc. ?


    Alan
  10. Mr Pig

    Mr Pig Active Member

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    How do you record the signal emanating from a speaker without a microphone?
  11. Alan Mac

    Alan Mac Member

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    You don’t. Why would you want to involve the loudspeaker, apart from it providing an electrical load for the amplifier?


    Alan
  12. karkus30

    karkus30 Well-Known Member

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    Errr, maybe I'm a bit thick but it says you can test the entire audio chain including room acoustics. I like the idea, can someone show the wiring set up because I can't work out how this is possible without a Mic?

    I can't see how you can even compare things from the power amp end of the chain. Can you input the speaker cables directly into the soundcard from the power amp, or is it something else?

    Me and poor Mr Pig are obviously a bit confused.:rolleyes::lease:
  13. Mr Pig

    Mr Pig Active Member

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    Yes. The post says that it can test speaker cables and power amps. That's what it says.

    And it doesn't test for audible differences, if you'll excuse me saying. It tests for electrical differences which are within the resolving capabilities of the sound card/computer DAC in question. And I hate to say it but for most computers, that ain't great...
  14. Mr Pig

    Mr Pig Active Member

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    Sorry but I just had to quote that sentence as I liked it so much. Superb :0)
  15. Alan Mac

    Alan Mac Member

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    Hardware connections are shown in the Help section entitled “Hardware Connections and Program Sources”.

    NOTE THE WARNING:
    “You should NEVER connect the output of a power amplifier directly to a sound card input....”


    Alan
  16. Autopilot

    Autopilot Active Member

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    If I misread that as patronising and smug, I apologise.
  17. Alan Mac

    Alan Mac Member

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    For objective evidence that MP3 compression really does cause easily audible signal degradation, listen to the horrendous difference signals from:

    Audio DiffMaker example files

    MP3 compression, 128 kbit/s and 256 kbit/s

    In comparison with these very large and distorted difference signals, the difference signals from nearly all other audio components pale into insignificance.

    The only other “component” with a difference signal comparable with the 256 kbit/s MP3 is likely to be the analogue LP. But anyone with an LP cutting lathe is unlikely to be willing to provide such evidence.


    Alan
  18. formbypc

    formbypc Member

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    I don't really need Diffmaker to tell me that mp3 coding introduces audible degradation, as I can hear it for myself.

    I'm not sure what point you're making with reference to LP - you're referring to the difference between what and what?
  19. Mr Pig

    Mr Pig Active Member

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    Music and noise.
  20. trailer

    trailer Active Member

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    This isn't a hi-fi component comaparison tool. Think of it as a way, for example, of comparing a remastered CD to the original.
    Last edited: Dec 14, 2010
  21. formbypc

    formbypc Member

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    The OP has a different opinion, though .....
  22. trailer

    trailer Active Member

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    I'm surprised no one tried to explain this before.
  23. formbypc

    formbypc Member

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    You mean that the OP has totally misunderstood what it can/should be used for?
  24. trailer

    trailer Active Member

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    Well as far as I can tell it is used for comparing two recordings. How you get those recordings is your business I guess.

    More vagueness.
  25. Autopilot

    Autopilot Active Member

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    Read the site.

    Plus have a google, there are loads of more knowledgable and hardcore sites with some good examples.
  26. Tone-uk

    Tone-uk Member

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    Seems like a few have you have read the site and understand what it's all about and some of you have not and do not!!

    The answers are all there - as hinted to by Alan Mac/Autopilot - have a read if your are interested.

    In fact, it's probably much easier to give it a try and learn as you go along.

    (don't know how that "!" got up there as a title??)
    Last edited: Dec 14, 2010
  27. trailer

    trailer Active Member

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    Well for those who haven't would you be obliged to summarise please?
  28. Tone-uk

    Tone-uk Member

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  29. trailer

    trailer Active Member

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    OK, I'll do it. Import two recordings into the program and the software will determine any differences between them.
  30. Tone-uk

    Tone-uk Member

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    Is that your summary from what I linked too???

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