John Curl's Blowtorch preamplifier part III

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^ According to Mark, the cost of providing any evidence of hearing ability of the so called 5%ers would be prohibitive :cool: By evidence, I mean real evidence of course, just in case he wants to tell me hearsay counts.

I don't think it would be prohibitive if you and others wanted to make donations towards it. It would certainly be prohibitive for me fund it single handedly. Maybe a wealthy audiophile would have interest it funding it. For starters, I think we would need to develop new double blind software, probably just A/B rather than ABX and with some other features, including the ability to operate hardware switching mechanisms (not just file playback).

Earl Geddes seemed to think a preliminary study might cost a few or several tens of thousands of dollars, but that would not be the end of it. One study would not be considered sufficient evidence by many people without any independent replication. In addition, a preliminary study might not tell us everything we think would be important to know.
 
how is it certain that such item (capsule, tablet etc) declared as 'placebo' is in fact completely inert ?.

It isn't always inert. Sugar pills have been used, but people become suspicious if no side effects. Sometimes vitamin B3 (niacin) is used because it can produce side effects in sufficient doses. However, doctors treating patients in a double blind study know the side effects of niacin, so they can deduce which patients are on placebo even though they are not supposed to know.
 
-90dB or so would be a stretch from Bruno's measurements unless one was routing the output current through one. For some applications only the break action has interest (charged line pulse generators) because it is bounce free. When open there is no current so no distortion.

Scott as usual...

I read the post as he is confused about measuring reed relay distortion as he took your example as a typical case.

The I suspect his relay issue was not with a reed relay but more likely a amplifier output unit. Unfortunately he did not run distortion tests at different signal levels which would give more information as to the cause.

What I have seen and I think showed here is that the current design for small signal armature relays is to use the coil actuator as a pull in solenoid. It is mechanically coupled to the actual switches. No steel springs anywhere in the circuit path and only magnetic field leakage into the conductors.

Gee what a surprise relay designers are cognizant of the small signal switch issues. ;)
 
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Apparently placebos can work even when you know it's a placebo, go figure.

Often, patients with health problem will be healed within a certain time. If you will be healed within three days, then whatever drugs you eat, whatever voodoos you practice, you will find that you will be healed after whatever you do. On day one you can go to a physician and your problem is still there, on day two you go to another therapist and the problem is still there, on day three you go to a shaman and voila!!
 
Any proof about this ability to "hear" differencies, supported by controled blind test?? :rolleyes:

I realize now it's the "P" word (proof) that causes all the problems. A testable hypothesis and well designed experiment in general only has a statistical measure on the result. For instance the 5% number is IIRC something someone just pulled out of their hat.

What percentage of the audio consuming public can discriminate an A from a B in a particular test would be interesting to know I suppose.

I personally don't see the difference between something "existing" for 5% or "not existing" for the other 95%. Existence in this context is relative.

As for preference I would hypothesize that few if anyone could fail to tell the difference between a good electrostatic speaker and a K horn, but fans of either would never switch. If Mark had Romy the Cat over he would probably be told politely that he could not live with the sound of Mark's system.
 
If Mark had Romy the Cat over he would probably be told politely that he could not live with the sound of Mark's system.

Probably the same if I had ScottW over, since he can't stand NS-10m speakers. I don't claim my system is ideal, but the speakers I have do reveal flaws in mixes, which is primarily what they are best used for. Unfortunately, good speakers are expensive, as would be a good bi-amp or tri-amp system to use with them.
 
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And it still doesn’t explain how all this modern equipment says there’s no differences in ‘this’ vs ‘that’ when it’s quite obvious (at least to me) there is?

Equipment do not make conclusions. I think why people failed to measure this difference is because they only look at one variable at a time... Its like looking at impedance alone when what we need to see is low impedance at the same time of a critical phase shift.
 
Not a good one. I have good headphones and a good headphone amp. For simple music enjoyment I can listen on almost anything, but in that case the listening is confined to the music, the performances, the arrangement, etc., not the overall sound of everything presented almost perfectly.

EDIT: Regarding some of my dac tweaking adventures, some of it has not been fun. I would have liked to quit at times. Felt it was owed to the people modding dacs to see it through. Still feel that way, after AK4499 there is more work to do with AK4137 and ES9038Q2M so the dac modding can hopefully turn out as well as possible while remaining reasonably cost effective. Allo's fortcoming USB dac might solve most of the good-sound-for-low-cost problems for those people who have computers suitable for upsampling and DSD conversion. For those who don't have that, a reasonably good job of it can be done with AK4137, its has just proven difficult so far to do it well in a simple way.
 
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For simple music enjoyment I can listen on almost anything, but in that case the listening is confined to the music, the performances, the arrangement, etc., not the overall sound of everything presented almost perfectly.
I'm glad to hear it :D Bob may not believe me but I can get quite emotional listening to a piece on youtube via the built in speakers ;)
 
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If most people say this white powder called aspirin makes their headache go away, it is true then. No other "tests" need to be done to know if it makes headaches go away. Does not matter if you know why it does so or not. Does not matter that you cant show a test measurement data to "prove" it does what people describe. Nor matter if you have a test which shows no change occurred in the person. The people's experience and perception of the aspirin effect is true and real.
THx-RNMarsh

This is a ticket for going back to dark ages.
If allowed to be implemented, it will have uncontrolled consequences, potentially dangerous to people/animals.

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I won’t participate in this thread from now on.
Take care.

George
 
I'm glad to hear it :D Bob may not believe me but I can get quite emotional listening to a piece on youtube via the built in speakers ;)

Oh I believe you, why wouldn’t I ?

I once had the opportunity to abuse a mid 80’s Porsche 930 for an afternoon.....

It’s hard to get emotional about a Kia now! But yet I will still drive it if I have too. :D
 
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