To DAC or not to DAC - Page 7 - AVS Forum
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post #181 of 185 Old 08-12-2013, 06:45 PM
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Originally Posted by kbarnes701 View Post

I've solved the problem of his posts - I don't see them any more (unless they are quoted of course).  

Good idea K.
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post #182 of 185 Old 11-02-2014, 03:43 PM
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<div class="quote-container" data-huddler-embed="/t/1445724/to-dac-or-not-to-dac/60#post_23597510" data-huddler-embed-placeholder="false"><span>Quote:</span>
<div class="quote-block">Originally Posted by <strong>kbarnes701</strong> <a href="/t/1445724/to-dac-or-not-to-dac/60#post_23597510"><img alt="View Post" class="inlineimg" src="/img/forum/go_quote.gif"></a><br><br>
Everything you say makes sense. But only to those who fail to understand, or fail to apply, the science behind audio and acoustics. To deny the level matching criterion is ludicrous. Even people who don't really subscribe to the whole blind ABX test schtick accept the impact of almost imperceptible level differences. You sound like someone who puts forward a perfectly formed view as to why the earth is flat and the sun revolves around it. I mean, it's <i>obvious</i> isn't it? I can see it with my own senses. </div>
</div>
<br>
+2. The level-matching is so critical that denying it shows a complete lack of understanding.<br><br>
I've used this example before: In a product I worked on, the output levels were spec'd to be as follows: 2.0V rms, into 10kOhm load, +/-10%, when fed with a 1kHz tone at 0dBFS. That means we could have product being built, and tested in the factory, passed and shipped, that had an output of 1.8V rms, and another that had an output of 2.2V rms.<br><br>
In a listening test not controlled for levels, those two would sound different to almost everybody. But they were the same DAC chip, the same op amps, etc.<br><br>
Without level matching, even the very same DAC chip will sound different. I could adjust a couple of the resistors to change the level, and that would change the "sound" in an uncontrolled listening test.
Sooo, I don't need to spend more to get my amp to sound as good as one much more expensive, I only need to turn the volume up a bit, right! (Oops. Just realized this thread is a year old.)

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post #183 of 185 Old 11-03-2014, 06:23 AM
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Sooo, I don't need to spend more to get my amp to sound as good as one much more expensive, I only need to turn the volume up a bit, right! (Oops. Just realized this thread is a year old.)
No. Turning it up won't change the sound as long as it isn't clipping. It will just increase the sound pressure level. People, however, choose the louder presentation in head to head comparisons. It is just a human characteristic.
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post #184 of 185 Old 11-03-2014, 06:36 AM
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No. Turning it up won't change the sound as long as it isn't clipping. It will just increase the sound pressure level. People, however, choose the louder presentation in head to head comparisons. It is just a human characteristic.
I was being a bit facetious and at the same time serious: If A/B testing says the inferior amp will be selected as the superior one if it is simply louder, then what does that tell us?
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post #185 of 185 Old 11-03-2014, 07:06 AM
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I was being a bit facetious and at the same time serious: If A/B testing says the inferior amp will be selected as the superior one if it is simply louder, then what does that tell us?
It tells us "superior" is a misnomer.
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