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  1. Old Comment
    wintermute's Avatar

    Why I DIY

    Hi cspirou, yes sometimes the journey is as valuable (or more so) than the end result. I think it is very smart to be concentrating on posting on your projects rather than getting caught up in philosophical discussions! I wish I did more work on my projects so I had more updates to post

    Tony.
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    Posted 17th November 2014 at 11:03 AM by wintermute wintermute is offline
  2. Old Comment
    abraxalito's Avatar

    Design ideas for Aune M1 DAC card

    Yes and no. The Chebyshev filter design program told me the central inductor's value was 1075uH, however I've since deleted the 75uH without apparent ill effects.
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    Posted 15th November 2014 at 02:07 PM by abraxalito abraxalito is online now
  3. Old Comment
    fas42's Avatar

    Design ideas for Aune M1 DAC card

    Is there a significance to the 75uH in series with the 1mH (L3 and L4)?
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    Posted 15th November 2014 at 12:26 PM by fas42 fas42 is online now
  4. Old Comment
    abraxalito's Avatar

    Design ideas for Aune M1 DAC card

    Discrete X100 gain stage would be a bit complex and occupy a large chunk of design (and debug) time.
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    Posted 15th November 2014 at 07:23 AM by abraxalito abraxalito is online now
  5. Old Comment

    Design ideas for Aune M1 DAC card

    Ouch...why not discrete? Source follower?
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    Posted 15th November 2014 at 07:20 AM by jambul jambul is online now
  6. Old Comment
    abraxalito's Avatar

    New .wav player from Aune looks very interesting

    I was also thinking this (with TDA1387) could go head-head with Altmann's Teraplayer, for those who miss having a display. Certainly will be considerably cheaper!
    I also like its using Cortex M3. Might be possibility in future to open source the firmware.
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    Posted 11th November 2014 at 06:49 AM by abraxalito abraxalito is online now
  7. Old Comment

    New .wav player from Aune looks very interesting

    Richard,

    the best dac + headphone card interesting, since the main board seem to give a promising decent sound process.

    we can hype the player with your card at head-fi, or my local community

    will see this player agains altmann teraplayer..

    Regards,
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    Posted 11th November 2014 at 04:59 AM by jambul jambul is online now
  8. Old Comment

    CD is better than vinyl, which is why vinyl sounds better than CD

    Quote:
    Originally Posted by mordikai View Comment
    Nice simple argument, but although seemingly logical, it largely misses the point. The kind of music you say sounds better on vinyl is not the kind of music audiophiles listen to. You state that much jazz and classical music has not suffered the same compression as pop music. So what explains the audiophiles preference for vinyl?
    The two examples you site no audiophile, or most other serious listeners would consider worthy of vinyl. Most vinyl lovers, love it for the unique sound, nostalgia, ritual or because it's cool, or a combination there of.
    I don't discount that a large number of people listen to vinyl for reasons of novelty or culture. There are many reasons to listen to vinyl but saying it's a technically superior medium is not one of them. Basically the way I think of vinyl vs CD is the same way I think of expensive mechanical swiss watches vs quartz watches. If you want to keep accurate time the best way to do it is with a quartz watch. Mechanical watches are more about the appreciation for the engineering that goes into it. The crucial difference is that you will never find a watch manufacturer that claims that mechanical watches are more accurate than quartz, whereas the audiophile world seems to have quite a bit of people that argue that vinyl is in fact better then CD.

    My article was more to say that you could make a reasonable case for vinyl from a music quality standpoint. The other case is just basic availability. There are many records that are not on CD and the only way to play them is with a turntable. Or you have a large collection of old records and repurchasing them is not worth it.
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    Posted 10th November 2014 at 10:52 AM by cspirou cspirou is offline
  9. Old Comment
    abraxalito's Avatar

    My latest infatuation - transformers

    I rather think that a saturating trafo would sound pretty grim whereas this is a mild effect. I also added more turns than the equation said simply to make the windings fit into two complete layers. More turns means more margin before saturation. Seems rather unlikely yet its possible I've received sub-standard ferrite cores....
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    Posted 8th November 2014 at 07:07 AM by abraxalito abraxalito is online now
  10. Old Comment
    fas42's Avatar

    My latest infatuation - transformers

    Have you made sure that there isn't a chance of the treble transformer cores saturating at high input levels? I would perhaps do experiments with multiple cores in parallel to make sure this wasn't happening ...
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    Posted 8th November 2014 at 05:49 AM by fas42 fas42 is online now
  11. Old Comment
    abraxalito's Avatar

    My latest infatuation - transformers

    Ah and to me I have a hunch that the bass slam is the result of subtracting superfluous noise, predominantly in the LF. But its only my conjecture, not my experience. For example in this case the slam gets a bit lost because the transformer's adding some noise (noise modulation) in a similar manner to magnetic tape 'softening'. I don't rule out that HF is being affected though so will check out whether my tweeter trafos are contributing some loss at HF. Subjectively though the HF hasn't been cleaner....
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    Posted 8th November 2014 at 03:47 AM by abraxalito abraxalito is online now
  12. Old Comment
    fas42's Avatar

    My latest infatuation - transformers

    Strange as it may seem, the expression "sacrifice bass slam" sends the message, to me, that there may be an issue with the higher frequencies - the key, "slam" quality of the sound comes from those higher frequencies being in good shape, IME ...
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    Posted 8th November 2014 at 03:26 AM by fas42 fas42 is online now
  13. Old Comment
    abraxalito's Avatar

    My latest infatuation - transformers

    What in what I wrote leads you to suspect I'm losing some treble?
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    Posted 8th November 2014 at 02:51 AM by abraxalito abraxalito is online now
  14. Old Comment
    fas42's Avatar

    My latest infatuation - transformers

    No, it is the one and the same thing: a satisfying nearfield becomes realistic grunt when scaled up - automatically. This is because the ear adjusts to higher intensity sound in a certain way, as part of its mechanism for protecting its delicate inner apparatus - this is something one can explore with live instruments, by listening at some distance away - would be termed nearfield sound from a speaker - and then going right up to the player of that real instrument.

    The 'correct' sound is for the bass slam and hearing deeper into the recording to co-exist, they do not exclude each other; highly manufactured pop recordings are excellent for picking up progress made - very, very meaty instrument sounds are punching hard, and at the same time the vocalist exists as a separate sound element, with a soft, floating voice, and deep, deep echo behind him.

    It sounds like you might be losing some of the treble - I would do a test with a frequency sweep going up to the highest frequency that still registers to my ears, to make sure that there wasn't a significant fall away.
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    Posted 8th November 2014 at 02:40 AM by fas42 fas42 is online now
    Updated 8th November 2014 at 02:43 AM by fas42
  15. Old Comment
    abraxalito's Avatar

    My latest infatuation - transformers

    Seeems we may be in search of rather different things - realistic grunt so far has not been on my agenda, just getting a nearfield experience to be most satisfying has been my aim. Most certainly realistic grunt will be on the list of things to do in future, scaling the experience up to far-field listening with bigger boxes (and going from 2-way to 3-way).
    However given that I'm hearing more now than I've heard before on seemingly familiar recordings - this morning it was the tinkling of the piano on Saint-Seans Symphony No.3 which drew my attention - why hadn't that particular sound registered with me before? - I'm continuing on the path which brought about these most recent improvements. I'm not yet adding outrageous capacitance, I shall most likely add a 'hexacap' later on today as there's only around 20,000uF at present on the supply.

    Capacitance when I added it before (on earlier chipamp projects) mainly had an impact on LF transients, making bass sound 'tighter' or 'tauter' but I may have to give up such lily-gilding now that I have the OPTs which probably are softening the bass. But they've given me so much more transparency its easy to 'sacrifice' the bass slam for hearing deeper into the recording.
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    Posted 8th November 2014 at 01:39 AM by abraxalito abraxalito is online now
  16. Old Comment
    fas42's Avatar

    My latest infatuation - transformers

    Ol' diminishing returns will kick in at some point - if it doesn't, then my take is that the real, underlying problem is not being addressed, and adding so much capacity is only indirectly improving things - much better, and cheaper, to go to the heart of things ...

    That Bryston amp I heard was the most impressive I've experienced, in being totally untroubled by being asked for ever increasing volume levels - its supply reserves would have been nothing special, yet it was able to deliver realistic grunt seemingly without end.

    So, there are definitely smart ways of getting there ...
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    Posted 8th November 2014 at 12:15 AM by fas42 fas42 is online now
  17. Old Comment
    abraxalito's Avatar

    My latest infatuation - transformers

    Hmmm, I am concerned about the devaluation of my adjectives over time. Rather like the Martin Colloms scale which had to be extended beyond 100....
    I'm fairly convinced now from these latest trafo experiments that the amps I'm using aren't transparent so its onward and upward on the path of more supply voltage and bigger step-down ratios.... Reflecting on this lack of transparency, given that opamps running a mA or so of output current are very sensitive to supply impedance, how much more of a problem is a poweramp running 1A or so into a load? Since my opamps (which are biassed into classA) have something around 10,000uF on the rails this tends to indicate that 10F would be required in a poweramp even if it were classA.....
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    Posted 7th November 2014 at 11:27 PM by abraxalito abraxalito is online now
    Updated 7th November 2014 at 11:32 PM by abraxalito
  18. Old Comment
    fas42's Avatar

    My latest infatuation - transformers

    I wouldn't tolerate anything less than "awesome" from you now, Richard ...
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    Posted 7th November 2014 at 10:35 PM by fas42 fas42 is online now
  19. Old Comment
    bogdan_borko's Avatar

    About 6 watts

    Nice speakers for a small room
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    Posted 5th November 2014 at 01:38 PM by bogdan_borko bogdan_borko is offline
  20. Old Comment
    wintermute's Avatar

    Repair of a vintage driver (Richard Allan)

    OK that is hardcore!! My first driver repair was a 12 " open back speaker that I found at the tip. The cone was falling apart and I stuck it back together with watered down pva glue and tissue paper! I Then ran it off my clock radio Other than that I've only repaired the suround (badly) on one of my drivers in my MTM's... need to revisit that one.

    Oh come to think of it I did pull my Phillips dome mids apart thinking I'd burnt out the voice coils only to find that a good clean and re-assembly fixed their distortion issue.

    Hat's off to your persistence!

    Tony.
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    Posted 4th November 2014 at 07:27 AM by wintermute wintermute is offline
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