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John Curl's Blowtorch preamplifier part II
John Curl's Blowtorch preamplifier part II
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Old 27th July 2010, 03:52 PM   #5261
SY is offline SY  United States
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John Curl's Blowtorch preamplifier part II
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Originally Posted by johnferrier View Post
SY,

What source(s) will you use?
It can be used with just about any source- the critical thing is the load, since the caps are 1uF. An amp with 100k or more of input impedance will do just fine. In my own tests of myself, I used both digital (ripped files and M-Audio 192 soundcard) and analog (phono). But the idea of the box is that I can take it with me and plug it into anyone's system.
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Old 27th July 2010, 04:11 PM   #5262
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Quote:
Originally Posted by SY View Post
It can be used with just about any source- the critical thing is the load, since the caps are 1uF. An amp with 100k or more of input impedance will do just fine. In my own tests of myself, I used both digital (ripped files and M-Audio 192 soundcard) and analog (phono). But the idea of the box is that I can take it with me and plug it into anyone's system.
Ah, okay. This likely accomodates extra fancy and extra cheesy, for the indulgent. Perfect.


.
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Last edited by johnferrier; 27th July 2010 at 04:14 PM. Reason: :P
 
Old 27th July 2010, 05:57 PM   #5263
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Anyone who isn't thoroughly insensitive
Buttocks, and it looked so promising at first, i even figured out a solution for the extra hole.
 
Old 27th July 2010, 07:12 PM   #5264
john curl is offline john curl  United States
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Richard Heyser had a box that did something special. I never saw it, but he would loan it to people to listen through and test any way that they liked.
It tested virtually 'perfect' but when you played music though it, it sounded awful. What did he do?
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Old 27th July 2010, 07:25 PM   #5265
SY is offline SY  United States
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John Curl's Blowtorch preamplifier part II
Relay that clicked on and off or something like that. Wouldn't get through more modern testing.
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Old 27th July 2010, 07:32 PM   #5266
john curl is offline john curl  United States
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You are correct, except at the time, virtually all audio testing used SYMMETRICAL TEST SIGNALS. Music is not symmetrical. Now, even then an asymmetrical pulse would have found it, but they didn't have convenient analysis for that, back then.
The biggest difference is that Richard Heyser was trying to show people how something could sound different with music yet still measure OK.
What SY insists on is that everything really sounds the same, and it is only in our expectations that anything subtle sounds different. I don't go for it.
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Old 27th July 2010, 07:41 PM   #5267
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John Curl's Blowtorch preamplifier part II
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What SY insists on is that everything really sounds the same
I call shenanigans. When have I ever said anything like that?

Show me something electronic that has been demonstrated to sound bad but measure well under the listening test conditions.

edit: I deliberately omit transducers, where interpretations of measurements are far more complicated. And I used the qualifier "under the listening test conditions" to exclude clipping and oscillation; I've been pretty vocal about the audibility of amps with differing overload recovery and design my own amps specifically to be excellent in that regard.
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Old 27th July 2010, 08:13 PM   #5268
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When have I ever said anything like that?

reading between the lines ...


Quote:
I call shenanigans.
same here.

but we love you anyway.
 
Old 27th July 2010, 08:29 PM   #5269
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John Curl's Blowtorch preamplifier part II
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but we love you anyway.
If only you guys were female and cute!
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Old 27th July 2010, 08:36 PM   #5270
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Default not "everything" sounds the same - even to "objectivists"

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People can hear all sorts of things in blind tests. Frequency response, phase, polarity, level compression, data compression, noise, crosstalk, distortion, overload, recovery time... for some reason, the bad vibes don't seem to inhibit those things. Hmmm.
 

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