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Topic: Doug Self preamp gets rough ride (Read 5095 times) previous topic - next topic

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  • wakibaki
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Doug Self preamp gets rough ride
http://www.diyaudio.com/forums/solid-state...-design-53.html

In the latter half of this thread, moderators defend the right of posters to undermine the reputation of the latest design from this outspoken opponent of subjectivism, based only on unsupported subjective opinion. Well-known designers and respected analog 'gurus' lend their tacit support by participating in the thread.

w
wakibaki.com

  • wakibaki
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Doug Self preamp gets rough ride
Reply #1
The principal author of the libel, one 'owdeo' earlier admitted 'I know this is not double-blind testing' and 'This may not be a scientifically valid test, but I think it was good enough to prove (to me anyway) that the difference in sound quality I was hearing earlier is real.'

Later he claimed 'I've done some blind testing and had no trouble picking the preamp'. When questioned on the subject he also admitted that he had not verified that the amplifier he had built met its design specification.

Owdeo claims 'as an EE' but confusingly said in the same post that he has only basic knowledge of electronics.

Nevertheless he insisted that the design was unsatisfactory, describing it in terms of the usual subjective twaddle saying 'The sound is still slightly "tight" or "overdamped" or something,', 'I know it's purely subjective and unscientific, but the difference is so big I'm sure it must be measureable if you could measure the right thing with the right equipment.'

These occasional smatterings of techno-bullshit and the pretence at blind testing evidently have all but a few at diya completely hornswoggled.

Meanwhile, diyaudio's reputation as a responsible organ (if it ever had one), continues to suffer.

Doug Self, who had earlier contributed to the thread, has ceased to post.

w
wakibaki.com

Doug Self preamp gets rough ride
Reply #2
The principal author of the libel, one 'owdeo' earlier admitted 'I know this is not double-blind testing' and 'This may not be a scientifically valid test, but I think it was good enough to prove (to me anyway) that the difference in sound quality I was hearing earlier is real.'

Later he claimed 'I've done some blind testing and had no trouble picking the preamp'. When questioned on the subject he also admitted that he had not verified that the amplifier he had built met its design specification.

Owdeo claims 'as an EE' but confusingly said in the same post that he has only basic knowledge of electronics.

Nevertheless he insisted that the design was unsatisfactory, describing it in terms of the usual subjective twaddle saying 'The sound is still slightly "tight" or "overdamped" or something,', 'I know it's purely subjective and unscientific, but the difference is so big I'm sure it must be measureable if you could measure the right thing with the right equipment.'

These occasional smatterings of techno-bullshit and the pretence at blind testing evidently have all but a few at diya completely hornswoggled.

Meanwhile, diyaudio's reputation as a responsible organ (if it ever had one), continues to suffer.

Doug Self, who had earlier contributed to the thread, has ceased to post.


I am unaware of when DIY Audio was a reliable source for the results of reasonable subjective tests.

You've hit one of my hot buttons - unreliable subjective testing is usually a cover for libeling good audio gear. I suspect that the perps mean well, but what they do is mostly creating and/or propagating false claims.

  • ExUser
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Doug Self preamp gets rough ride
Reply #3
Now I want to try this preamp! I'm not big on the whole preamp thing in general, but hey, if it pisses off subjectivists...

Doug Self preamp gets rough ride
Reply #4
Now I want to try this preamp! I'm not big on the whole preamp thing in general, but hey, if it pisses off subjectivists...


I have a copy of "Self On Audio" second edition, which contains the 1996 preamp articles. The genius of the preamp is IMO not any special innovations, but rather the careful and clear way that Self explains how he optimized a pretty common and straight forward design. Basically, he's exploiting the fact that the now sub- 50-cent 5532/5534 op amp chips are really very, very good.

By now the chip design has to be more than 30 years old, but it still shows up in new equipment designs. In the day, many of us merged these chips with the most recent wisdom from Vanderkooy and Lipshitz about RIAA networks and pretty well cook-booked our ways into our last phono preamps. Nothing ever emerged that sounded better for use with MM cartridges, to this day.

  • greynol
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Doug Self preamp gets rough ride
Reply #5
Tight and overdamped?  Since when does a preamp take on the characteristics of a poweramp driving speakers?
13 February 2016: The world was blessed with the passing of a truly vile and wretched person.

Your eyes cannot hear.

Doug Self preamp gets rough ride
Reply #6
Tight and overdamped?  Since when does a preamp take on the characteristics of a poweramp driving speakers?


Trying to decode the stilted subjectivese, I came up with the idea that this listener's baseline for a phono preamp had a RIAA preamp that over-emphasized the bass due to an equalization error.

That would be a little surprising because the most common tech errors in RIAA preamps usually end up causing bass that is thin-sounding. 

OTOH the Self design has an effective subsonic filter which would avoid some common kinds of excess bass due to tone arm resonances and/or incipient feedback due to a lack of acoustical or mechanical isolation.

  • greynol
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Doug Self preamp gets rough ride
Reply #7
So this was about a phono preamp?  The OP and tilte were vague in this regard.
13 February 2016: The world was blessed with the passing of a truly vile and wretched person.

Your eyes cannot hear.

Doug Self preamp gets rough ride
Reply #8
So this was about a phono preamp?  The OP and tilte were vague in this regard.


It is about a complete traditional preamp including phono input, line level input(s) and tone controls.