I do find that this experiment does prove a point though. Or so it seems. That capacitors, wire and resistors were of no consequence in that particular test.
You're right, my memory was faulty, they didn't bother to do anything with the sort of rigor a paying reader should expect.
They got entertainment! Lasting entertainment! They certainly expect that (and mostly don't get it).
BTW since the amps imitated had differently characterized outputs, is it not likely, scientificly speaking, folk would hear a difference? In time domain JND can get down to @5 microseconds.
Though they didn't bother to do it, I'd guess that the amps in question could have been distinguished in a blind test before the change in the SS amp's output impedance and distortion; one needn't invoke esoteric and controversial factors. After... probably not.
Well, a guy can't even get a night's sleep, without revolution by the next morning. ;-)
Some here think that Bob Carver can do no wrong. I recommend that they buy Carver products as best they can, and be done with it.
I have, of course, known Bob Carver since the early '70's. He is one smart guy, a physicist, like most audio designers, and seemingly deaf to subtle musical quality. Probably due to his higher education, and the toll it appears to have imposed in his listening ability, also demonstrated by a number of others contributing here. Ref. 'Drawing with the Right Side of the Brain' or a similar title that I have here.
He has also 'proved' that crossover distortion is inaudible, and poor regulation of power supplies, i.e. small caps, is actually an advantage in power amp design.
He is strictly mid-fi, with effects, and he only makes expensive examples to 'shoot them down' in double blind listening tests, that are flawed in the first place. He is truly in the 'non-believer' camp, which is OK with me, as he doesn't tell me how to run my life or design audio products, at least, not on a daily basis.
Some here think that Bob Carver can do no wrong. I recommend that they buy Carver products as best they can, and be done with it.
I have, of course, known Bob Carver since the early '70's. He is one smart guy, a physicist, like most audio designers, and seemingly deaf to subtle musical quality. Probably due to his higher education, and the toll it appears to have imposed in his listening ability, also demonstrated by a number of others contributing here. Ref. 'Drawing with the Right Side of the Brain' or a similar title that I have here.
He has also 'proved' that crossover distortion is inaudible, and poor regulation of power supplies, i.e. small caps, is actually an advantage in power amp design.
He is strictly mid-fi, with effects, and he only makes expensive examples to 'shoot them down' in double blind listening tests, that are flawed in the first place. He is truly in the 'non-believer' camp, which is OK with me, as he doesn't tell me how to run my life or design audio products, at least, not on a daily basis.
Several people on this thread (Bas?) have made the same claim. Personally, it makes no sense to me (your approach seems much more logical and the results show it), but there's no accounting for fashion.
Is that a film review of yours, or criticism on the entire body of work of Amit Goswami?
This is the high priced comparison sample that he used to 'prove' that he generated the same 'quality' with his cheaper solid state amps.
From Wikipedia on group delay:
"Group delay in the audio field"
"Group delay has some importance in the audio field and especially in the sound reproduction field. Many components of an audio reproduction chain, notably loudspeakers and multiway loudspeakers crossover networks, introduce group delay in the audio signal. It is therefore important to know the threshold of audibility of group delay with respect to frequency, especially if the audio chain is supposed to provide a high fidelity reproduction. At the time of writing no extensive data is available, and the concept is often treated by "rule of thumb" or based on hunches and received wisdom."
So what does this do to your statement that things like frequency dependent phaseshift are not often measured but can be heard?
jd
That doesn't matter SY, he built the tube amp to compare to his solid state amps. Ask him, yourself.
Having seen some of the stuff Glenn is spending his time on, I would not be surprised if he actually knows what he is talking about.
Many of the applications he is involved in, are far more demanding than an audio amplifier.
Magura 🙂
There isn't an accepted procedure and quantification to test Group Delay, not yet.
No doubt there are many fields that require high degree of expertise. However, it may be wrong to project from other fields on SOTA audio gear design.
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