Sound Quality Vs. Measurements

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"So, there are two possibilities here. Either the WAVAC is a perfect effects box. Or, amps like the WAVAC and the Soulution do something else right, something which still evades measurement, but which is essential in producing the most natural sound without audible artifacts."

It's amazing that the look of an amplifier has no effect on the perception of sound, nor its size, weight and price.
 
It's amazing that the look of an amplifier has no effect on the perception of sound, nor its size, weight and price.

Yes, it is remarkable. Equally remarkable is the lack of correlation between a good story and high ratings. Perhaps the two given choices are not the only ones.

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. :D
 
Yes, it is remarkable. Equally remarkable is the lack of correlation between a good story and high ratings. Perhaps the two given choices are not the only ones.

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. :D

It's indeed the whole package SY, as with any musical experience, live music most notably included. Man has a tendency to decorate and accessorize all it cherrishes in three cool categories: woman, cars and audio. For the US I would include a fourth: guns.

vac
 
It does appear that Soulution Amplifiers have the measurement crown, Sound..?


What are they doing differently from Chris Hansen , who's zero NFB AYRE amplifiers do not measure near as well ..?

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.
 
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. :D

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.
 
No, third is fine. Many like it. For the rest, random noise doesn't intermodulate, so yes.

OK, 1st is Soulution , last is VTL ....


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.

Who doesn't .... :scratch1:

Have you ever measured the Denon?

He's scared ..... :) Now could Wave tell the difference between Triode and Denon , blindly that is .
 
Driver frames in gun metal blue? Baffle has to be hand checkered to help diffraction. You have top get with the times though and have a special version in pink camo grill cloths.

My old Denon DRA 35 was a bottom end stereo receiver. It has put many a big buck amp to shame for simple listenability in it's time. Yea, it fails my wife's test.
 
He's scared ..... :) Now could Wave tell the difference between Triode and Denon , blindly that is .

Actually, I can. Denon still sounds like a darn good amp; triode itself does not sound at all, but well prepared it sometimes sounds as if it does not exist. I myself was fooled several times by my own prototypes, and other people were. I once jumped and turned around, before realized that there can't be a waterfall in my living room. :D
However, that time it was not a triode, it was a single ended MOSFET output, bootstrapped by one more MOSFET follower, and loaded on a current mirror. Driver was a pair of vacuum tube triodes, active loaded on gyrators, with deep feedback around them. It really scared me before I realized that is a reproduction from an ordinary CD.


Such tests I value much more than that ober-organized double blind sessions... If subjective mind had been fooled, that's it!
 
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Just curious. If you have found a mainstream, reasonably priced amp that sounds great subjectively - maybe something in the measurements would indicate why.
Harmonic structure
TIM
IMD
Noise
Output impedance vs frequency
Stability into difficult loads

Stuff like that. But maybe that's just me. I like to measure stuff.
 
Pano
Amazing how a thread can come right back on topic after 1075 posts!

You are in good company with we who like real repeatable objective measurements. When I have subjective evidence I can't explain, I want numbers.

Here is an amp to test. Rotel 840 integrated. Ignore the preamp as it is passive save the RIAA, from the early 90's. Along with the RB 941's I have, the only amps that normal people (socio-economic, no pretense to mental "normalcy") can buy that pass my wife's critical horn test. Nothing special I can see about its schematic, but I am just learning. You can get one off e-bay for just under what they cost new. ($300) I have seen them go for close to that. Not much used stereo goes for retail. I have an early Creek that sounds very good to my ear, but it has not be in front of The Judge.

What failed her "horns grate her teeth, give her a headache test"? BTW live does not and these fail at very reasonable levels.
Hafler,B&K, Addcom, HK, Meng, Yamaha, Onkyo, PS, CM Labs, Sanyo Plus, Brown, Bedini, Parasound (pre John C.), Denon, Sony. She did like the Cary triode. I did not bring the Aragon home as it was too expensive but I loved it. Of this failing set, only the B&K and Hafler could pass my "steel string" distortion where Julian Bream's bass strings sound metal, not nylon. I can conclude with available subjective information, the issues are likely related. Now, let's look for a objective measure.

The Rotel is clean, but not great. DF about 40 at 1K. I need to measure higher. Bi-polar. Classic simple LTP input, VAS and twin outputs. Reasonable bandwidth. Nothing special in the specs I could point to. Amp 2, Hafler 120. Again nothing too special. Cleaner numbers, higher DF, wider BW. Schematic I don't quite understand yet but basic topology pretty conventional. MOSFET outputs. Twice the power of the Rotel.

I was comparing it's acoustic output to my DH 120. Injecting an artificially contrived zero starting pulse, the Rotel first rise time was not as delayed as the Hafler, and it became in sync with the electrical output quicker. Does this mean anything? I don't know. It is a difference I could measure. As soon as I get the 120 rebuilt I will test again. ( I was testing the limits of some power supply mods... I found them). I am trying to build a current probe that can see down to 4K where I was testing. My attempt is stalled at about 10 K. I may have to put an amp on it. I want to compare the voltage to the phase at the amp terminals in this test and see if there is a difference I can measure. Then see if it is still there with a resistive load. Ideas most welcom.
 
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