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發表於 2017-8-22 09:19:23
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momei 發表於 2017-8-22 09:16
This was a post by Peter Mok 387 in another thread:
“””Hi Momei, I found the sound energy in my ...
Hi Peter,
Your question opens the Pandora box and incites more questions than answers. As I see it there are two parts in your question : a. What you observed was placebo effect or not, and b. If not, is there a "scientific" explanation to what you observed.
I do not see myself having enough knowledge and capability to provide definitive answers to part b. Rather I would list points relating to it and I believe different people have their own views on these points. Deal with the easier part a first.
Part a. Good that you more or less have solved the issue of image impairment and high frequency irritation (possibly ringing and compression induced distortion to me).
Was it placebo effect (to me that means imagining the effect rather than it actually being there)?
To find out:
*you remove the diffuser and have another person operate the phase switch of the DAC playing the SAME track. On Off On On Off On etc. Make sure you won't know there is a consecutive On On or Off Off such that you may guess it is On Off instead of On On or Off Off. If you are able to identify correctly over 70% of the On and Off, it is most likely Not placebo.
*you install the diffuser, play the SAME track and repeat the On Off and identification operation again. Tell us what you observe. Any more image impairment and high frequency irritation in both On and Off positions?
*if you have the 2017 HiFi Show CD, play track 5 La Campanella and repeat the two operations above, on/off phase switch and with/without diffuser. In my system, I have the violinist with a focused image and standing in centre slightly in front of the speaker plane whilst the orchestra is placed behind him a foot or two, extending to the back wall and two side walls. I think you would discern at least two different phenomena in your two operations. The image of the violinist: the better one has a more focused and compact image whilst the other one, more diffused and larger. Soundstage of all the performers: the better one had all of them more forward whilst the other have all of them pushed back to the wall.
The two better ones should go hand in hand and indicate positive absolute phase.
*if you would like to obtain more experience about absolute phase, get hold of someone who has a DAC with phase switch and have it brought to your place in substitution of your present one. Repeat the same operations and you may have different observations. Why? Because usually such a phase switch is merely a cheap add on without full devotion and engineering, it being an ancillary to the DAC that some owners do not even use at all. One type of phase switch may change the phase in the digital domain, augmenting the algorithm whilst another may change it in the analogue domain.
*want to experience more? Take two types of CDs, one in your system showing positive absolute phase and the other negative absolute phase, and your DAC with phase switch to your friend's place. Carry out the two operations. You may even find your friend's system has a different absolute phase to yours.
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樓主: Siuping
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發表於 2016-8-19 21:27:59
。但是Hiendy 已比其他的好，近來又多了一些討論。希望可以持續下去。
