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Old 19th January 2012, 01:38 AM   #1081
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Default Square?? third order in the 10khz rise and not flattop at 1khz

Quote:
Originally Posted by scott wurcer View Post
I suspect they have the usual creative definition of "zero" feedback. A couple of obvious thought questions. What bi-polar output stage at any bias level has a ppm level open-loop transfer function? How do you make an arrangement of bi-polar devices have a usable well defined temperature stable gain with NO feedback (which includes degeneration)?

Love the build quality.
I don't understand the rise/fall curvature on hte 10khz signal and the |100mV| or so voltage rise on the 1khz signal, there is also an overshoot leading edge
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Old 19th January 2012, 02:40 AM   #1082
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It is necessary to use SIGNAL AVERAGING as well, with harmonic measurement.
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Old 19th January 2012, 02:42 AM   #1083
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Quote:
Originally Posted by vanderpol4 View Post
I don't understand the rise/fall curvature on hte 10khz signal and the |100mV| or so voltage rise on the 1khz signal, there is also an overshoot leading edge
Ok my guess is it is a feed forward amplifier with some sort of quasi-dc stabilization;
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Old 19th January 2012, 03:05 AM   #1084
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Quote:
Originally Posted by john curl View Post
7th and 9th harmonic distortion with a 5KHz test tone ....
That works for me. There can be quite a mess up there. 5KHz is a good place to measure, but I've seen things get messy starting at 2KHz and up.
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Old 19th January 2012, 03:51 AM   #1085
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Quote:
Originally Posted by john curl View Post
7th and 9th harmonic distortion with a 5KHz test tone at levels between 0.1W and 25W. There will be a worst case level at the transition between Class B and Class AB.
Sonic signature ...?
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Old 19th January 2012, 03:55 AM   #1086
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I hear that stuff as the "harshies". Doesn't always jump out at you, but makes you want to turn it off, not listen for long. An unwanted, annoying edge.

Wonder what JC thinks?
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Old 19th January 2012, 03:58 AM   #1087
a.wayne is offline a.wayne  United States
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I know amplifiers that sound like that , dynamically powerful, the first 2 or 3 recordings sound very alive, then no music, very hi-fi, non involving and fatiguing to listen to.
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Old 19th January 2012, 04:14 AM   #1088
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Quote:
Originally Posted by Wavebourn View Post
Stuart; I have such experience. More than year ago I bought a cheap discounted HT receiver in order to use it as a donor for DSP, for tube based home cinema. But still did not dare to damage it, use as is. It really sounds very close to vacuum tube output amp. I once had a guest in my house, who is an audiophile. We were going to take my Gubernator single ended triode amp and go to another audiophile, to try it with his nice speakers. Some record was playing through my HT system, when he come, and he asked, if it was tube amp, I said no. He said that for solid state amp it sounds too nice.
Hello

A home theater receiver, which brand and model ?

I would be currious to find the schematic of this HT receiver with Google, to look at it.

Thank

Bye

Gaetan
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Old 19th January 2012, 04:22 AM   #1089
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Denon AVR-591.
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Old 19th January 2012, 04:39 AM   #1090
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Hi,

Quote:
Originally Posted by SY View Post
Before speculating on yet-to-be-determined phenomena, it would be nice if someone could actually show that the $45k Soulution actually sounded any different than a $2000 Parasound or a $300 Marantz... I'm just dreaming, of course.
Well, it has been shown before (if not for the precise amplifiers you have listed, but in principle), even in blind tests. However it would seem that you reject the evidence so far in the public domain.

Would you care to precisely define in detail what "actually show" would entail?

Ciao T
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