John Curl's Blowtorch preamplifier part II

[bcarso]

Originally Posted by RNMarsh

does that matter? The current discussions are great.

No --- only that one might suppose that FT had initiated the thing based on the name of it. In fact he told me he expressed some reticence when he found out about it, but agreed to participate. Despite having retired from Harman, he's busier than ever.

[RNMarsh]

I just found some good stuff related to being rude: There is the socially acceptable way as often express here (sarcasm, inuendo etc) and there is the direct way - not socially acceptable. Feel free to use any of these:

I'd like to apologize in advance for my behavior later.
Enough talk about you. Let's talk about me!
The last thing I want to do is disappoint you. BUT it's still on my list!
Two wrongs dont make a right But three rights make a left.
Scientists say the universe is made up of protons, neutrons & electrons.... They forgot to mention morons.
If it moves, its Biology.
If it stinks, its Chemistry.
If it doesn't work, its Physics.

But some here do pretty good without my help. Got more?

[Wavebourn]

Originally Posted by RNMarsh

does that matter? The current discussions are great.

How is it called, how to enter it?

[RNMarsh]

Originally Posted by bcarso

No --- only that one might suppose that FT had initiated the thing based on the name of it. In fact he told me he expressed some reticence when he found out about it, but agreed to participate. Despite having retired from Harman, he's busier than ever.

What is he up to these days that keeps him so busy? ? Going to write a book, perhaps?

[RNMarsh]

Originally Posted by Wavebourn

How is it called, how to enter it?

"Audio Test & Measurement Engineering Group"

The last couple dozen emails are pretty interesting --

Go to LINKEDIN and sign up, first, then find the forum inside

[gpapag]

Originally Posted by RNMarsh

No need to... I made the straw man to bring up the point. I use FFt/THd/MLSSA/IM et al. But, I am leaning to finding correlations. I think my input has demonstarated that.

On this forum and this DIY site there are lots of fft graphs of someone's favorite design. So, they go back and forth on listening and fft data or IM or what-ever. Without correlation.

Is this nieve to ask you/others here to try and think about doing tests that do correlate better or even easier? If we dont or cant, who will? Are we doomed to this situation?

Is anyone here capable of designing test equipment that can correlate better? What would we need to do that? Or, tests that do with what we have? Does anyone even care?

Thx, Dick

Originally Posted by jcx

measures that correlate with listening impressions will require someone to start presenting Psychoacoustic Science informed, controlled, Blinded listening tests with positive results – correlating with circuit or waveform features

so far the very 1st step (precondition really) appears to be a insurmountable hurdle for the "subjectivist" Audiophile community


we do have the GedLee Metric - rarely brought up but actually has some human test data: Perception

I would like to ask if there is a way to derive the Gedlee Metric of the DUT from the FFT (amplitude and phase of the harmonics) of the output (OK at some different signal levels too)?

http://www.gedlee.com/downloads/THD_.pdf

George

[fas42]

Originally Posted by Pano

Maybe. It may depend on the skill of the engineer and producer. I've heard some surprising multi-track pop rock mixes that had great space and realism to them. Rare, tho.

This is where the big breakthrough in achieving highest quality audio replay can come about ... when a system truly comes together in every aspect, then all, I repeat, all, pop rock mixes have "great space and realism". In fact, many such recordings become absolutely "huge", the level of detail and the intricate nature of their composition is fully revealed, and they are a marvel to behold ...

Frank

[Wavebourn]

Originally Posted by RNMarsh

"Audio Test & Measurement Engineering Group"

The last couple dozen emails are pretty interesting --

Go to LINKEDIN and sign up, first, then find the forum inside

Hmm...


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[bcarso]

Originally Posted by RNMarsh

What is he up to these days that keeps him so busy? ? Going to write a book, perhaps?

The publisher is pushing for a second edition of Sound Reproduction. He's active on various standards committees including SMPTE (who have now embraced AES involvment) and also lectures a lot.

[Wavebourn]

Found it. Waiting for Greg Groeper to approve.
But anyway I have no budget for AP equipment.