Exactly, that would disprove the null hypothesis, which is logically allowable. I'm not holding my breath...
Frequently these days builders will defeat the inherent shielding of a structure, like cellphones working in elevators, etc. The fringing field at radio frequencies for car windows would make a car a poor Faraday cage.
I doubt it, casual listening (op-amp rolling) would probably best describe it. And BTW I knew Bob Pease for more than 30yr. and everything he ever told me in private about audiophiles was unprintable, same went for Jim Williams (but he was polite about it).
No. I heard it instantly. I fitted the op amps into holders so could easily replace them with the originals. So could easily compare. Didn't do actual tests with equipment, just used my ears. I also tried some analog devices but preferred the sound of the Burr Browns instead.
I haven't read the whole thread, its very long. I'll do my best though.
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Scott
Don't get me wrong, I'm not saying that there aren't audible differences between op-amps but I suspect they only occur when the op-amp is pushed close to the edge of it's specified performance envelope.
I've searched far and wide for statistically valid objective evidence of audible differences but I've found nothing.
Can anyone point at a webpage or other reference that does show that?
Don't get me wrong, I'm not saying that there aren't audible differences between op-amps but I suspect they only occur when the op-amp is pushed close to the edge of it's specified performance envelope.
I've searched far and wide for statistically valid objective evidence of audible differences but I've found nothing.
Can anyone point at a webpage or other reference that does show that?
I am certain a quick settling time and high slew rate are the ones to look out for. For instance the settling time of the opa637 is 3 times as fast as the opa132 and 1.5 as fast as the opa627. Also slew rate of opa637 is 5 times as high as opa132 and twice as high as opa627.
All this information is from texas instruments website.
All this information is from texas instruments website.
That's true - however that's why science has developed checks and balances like peer review, which is what's happening here. Subjective bias is unavoidable - because we're human. Its merely your opinion that descriptions of sensory input aren't scientifically rigorous - would you like to support that opinion with evidence and reasoning, which traditionally has been the way science works?
So you claim, but your claim here is merely a hypothesis. Now to be rigorous science, a hypothesis must be falsifiable. At present yours is not because it contains non-rigorous words like 'properly'. Care to shore up the lack of rigor?
He won't be able to because of the weasel word used - 'properly' - which you have yet to explain.
That remains your opinion, yes.
Have you at least scoped it to make sure all is well ?
This is a Micromega Stage 2
http://www.diyaudio.com/forums/anal...u-have-checked-see-its-stable-havent-you.html
From my experience, even tho it is not a "controlled" experience, I often found that metal case parts sound better. It is probably because one simply has better build quality, not because of the case, so I claim nothing. But if you think that everyone has the same listening ability then of course you are wrong.
Imagine how a optocoupler(?) or a photo diode works. A certain amount of light intensity is required to make electrons move. Doesn't this, to certain degree, happen also with transistors? The metal can is supposed to better protect the junctions from the external influence, no?
Try the blind test under the sun in a daylight. Who knows it will be audible there?
Al of this diy on the stage 6 was done over 10 years ago, tried various chips, including some analog devices. I liked the sound from the burr browns, just used my ears and spendor speakers. The AD's had a thinner sound, possibly more detail in the HF if I recall correctly. Was happy with the opa627 and opa637, couldn't use opa637 to replace some of the original op-amps due to the gain not being unity stable.
That's great.
The Micromegas were (and still are) a great player. I think all the original Stages, that's 1,2 and 3 used NE5534's as original fitment. I don't know what the 4,5 and 6 used as original.
Abraxalito
So you claim, but your claim here is merely a hypothesis. Now to be rigorous science, a hypothesis must be falsifiable. At present yours is not because it contains non-rigorous words like 'properly'. Care to shore up the lack of rigor?
I thought my post # 1936 explains how to run a proper DBT. As SY correctly points out in the following post, it won't allow you to prove that the two DACs sound the same, but it will allow you to prove whether the sonic improvements that Audioman reports when changing from plastic to metal can op-amps are real or imagined. That's especially true if the same digital front end of the DAC is used and only the I-V and o/p stages are different by means of different packages for the same op-amp (although otherwise closely matched using identical components).
But no doubt you'll have a reason why that's not the case. I know...it's the DBT switch contact that masks any audible differences or the 0.01% difference in the values of the feedback resistors. Right?
Let me just reiterate in case you haven't yet realised it - I'm not saying that there aren't audible differences between op-amps but people who make those claims must prove it.
I'm still waiting for you to provide that reference to such proof by the way, but you seem to have skipped that in your replies.
So you claim, but your claim here is merely a hypothesis. Now to be rigorous science, a hypothesis must be falsifiable. At present yours is not because it contains non-rigorous words like 'properly'. Care to shore up the lack of rigor?
I thought my post # 1936 explains how to run a proper DBT. As SY correctly points out in the following post, it won't allow you to prove that the two DACs sound the same, but it will allow you to prove whether the sonic improvements that Audioman reports when changing from plastic to metal can op-amps are real or imagined. That's especially true if the same digital front end of the DAC is used and only the I-V and o/p stages are different by means of different packages for the same op-amp (although otherwise closely matched using identical components).
But no doubt you'll have a reason why that's not the case. I know...it's the DBT switch contact that masks any audible differences or the 0.01% difference in the values of the feedback resistors. Right?
Let me just reiterate in case you haven't yet realised it - I'm not saying that there aren't audible differences between op-amps but people who make those claims must prove it.
I'm still waiting for you to provide that reference to such proof by the way, but you seem to have skipped that in your replies.
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