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John Curl's Blowtorch preamplifier part II
John Curl's Blowtorch preamplifier part II
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Old 22nd July 2013, 11:18 PM   #41871
john curl is offline john curl  United States
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I would recommend that they buy one on E-bay.
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Old 22nd July 2013, 11:30 PM   #41872
SY is offline SY  United States
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John Curl's Blowtorch preamplifier part II
Quote:
Originally Posted by Kindhornman View Post
It seems we can make the exact same arguments for audio equipment as for wine.
For speakers, sure- but that still requires DB for accurate evaluation (see Toole, for example). For boxes of gain, no, we understand electrical signal transmission well enough to trivially design and construct audibly transparent amplifiers. We can verify with DB that they are transparent, but this has been so well established over decades that we can accurately predict from measurement alone whether or not this will be the case. The "measures good, sounds bad" canard is just that.

Effects boxes posing as amplifiers are a different question, and there, individual preference or taste comes into play (but still needs to be evaluated ears-only). But that's not what I design, that's not what John designs.
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Old 22nd July 2013, 11:58 PM   #41873
jacco vermeulen is offline jacco vermeulen  Netherlands
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Originally Posted by Kindhornman View Post
If someone
The used one that was offered in Turkeye earlier this year, no 40, had a €16k asking price. Aka > $20k.

(question is how many folks have expensive wine, but really can't judge whether it's any good)
 
Old 23rd July 2013, 12:06 AM   #41874
jcx is offline jcx  United States
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Waiter, There’s Coke in My Wine! : Inside IWM
 
Old 23rd July 2013, 12:24 AM   #41875
Max Headroom is offline Max Headroom  Australia
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Default Fat Soluble Vitamins Can Be Toxic....

Vitamin poisoning - Wikipedia, the free encyclopedia
Further links in the article.

Dan.
 
Old 23rd July 2013, 12:33 AM   #41876
Max Headroom is offline Max Headroom  Australia
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Default Testing The Not Obvious....

Quote:
Originally Posted by simon7000 View Post
I just got the Michael Percy shipping notice on my Bybee!
Hello Simon, I see here on the forum that you do much sensible work and investigation.
I am most interested to learn your objective and subjective findings.
I believe you may need to look at very low frequency 1/f noise measurements.
Some interesting discussion here - What is Terra Firma?

Dan.
 
Old 23rd July 2013, 12:50 AM   #41877
Waly is offline Waly
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Quote:
Originally Posted by Max Headroom View Post
Hello Simon, I see here on the forum that you do much sensible work and investigation.
I am most interested to learn your objective and subjective findings.
I believe you may need to look at very low frequency 1/f noise measurements.
Some interesting discussion here - What is Terra Firma?
Amazing stuff.

They have no limits and no shame.
 
Old 23rd July 2013, 08:37 AM   #41878
jan.didden is offline jan.didden  Europe
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Quote:
Originally Posted by Kindhornman View Post
Double blind is a useful test but by now we must know it can not be an only test, there is much more going on than a simple set of numbers or this conversation would have ended years ago.
There are two differents things involved here. We all have our preferences for equipment, very personally. If someone likes amp A but not amp B, that's his preference and he doesn't have to 'proof' anything to anybody for that.

OTOH if someone declares that amp A sounds different from amp B, or cable X sounds better than cable Y, that's a falsifiable statement. If the statement is used to convince people to buy A instead of B we should want to know whether the statement is true, and I don't know of any better method than some form of controlled test.

These two aspects are constantly confused and mixed together and that is the reason that this discussion hasn't been resolved decades ago.

jan
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Old 23rd July 2013, 11:44 AM   #41879
DF96 is offline DF96  England
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Quote:
Originally Posted by Waly
Amazing stuff.
Yes, an interesting mixture of confusion and half-truths.

I like the part where they say their clocks are so good they don't have to measure them.

As usual, they seem to confuse long-term stability (atomic clocks) and short-term jitter. They also may be confused about voltage-controlled crystal oscillators: this is about the worst type of oscillator as the master for an audio system, because it adds jitter by virtue of having a voltage control input. However, as a slave in a PLL some form of voltage control is a requirement.
 
Old 23rd July 2013, 11:50 AM   #41880
jan.didden is offline jan.didden  Europe
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@Jack: found another visual illusion pic.
How much does the color of the middle band differ end-to-end?

jan
Attached Files
File Type: pdf illusion band.pdf (7.0 KB, 51 views)
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