Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

The Lounge A place to talk about almost anything but politics and religion.

John Curl's Blowtorch preamplifier part III
John Curl's Blowtorch preamplifier part III
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Closed Thread
 
Thread Tools Search this Thread
Old 21st November 2018, 08:16 PM   #10071
PMA is offline PMA  Europe
diyAudio Member
 
PMA's Avatar
 
Join Date: Apr 2002
Location: Prague
Quote:
Originally Posted by mmerrill99 View Post

PMA's ABX test fall into the category of ABX testing that I am talking about - I already suggested how he might improve it
You are definitely not the one from whom I get any kind of suggestions.
 
Old 21st November 2018, 08:19 PM   #10072
mmerrill99 is offline mmerrill99
diyAudio Member
 
Join Date: Aug 2014
Quote:
Originally Posted by PMA View Post
You are definitely not the one from whom I get any kind of suggestions.
Yes, I noticed you refused/pretended not to understand it - stating "I did my best" or words to that effect
And subsequently refused or pretended not to understand Jakob2's explanations

Last edited by mmerrill99; 21st November 2018 at 08:22 PM.
 
Old 21st November 2018, 08:22 PM   #10073
scottjoplin is offline scottjoplin  Wales
diyAudio Member
 
scottjoplin's Avatar
 
Join Date: Dec 2015
Location: Penrhyndeudraeth
Weren't you thinking of starting your own thread? What happened, Jakob not up for it?
 
Old 21st November 2018, 08:26 PM   #10074
mmerrill99 is offline mmerrill99
diyAudio Member
 
Join Date: Aug 2014
Quote:
Originally Posted by scottjoplin View Post
Weren't you thinking of starting your own thread? What happened, Jakob not up for it?
Is that an expression of interest?
 
Old 21st November 2018, 08:29 PM   #10075
scottjoplin is offline scottjoplin  Wales
diyAudio Member
 
scottjoplin's Avatar
 
Join Date: Dec 2015
Location: Penrhyndeudraeth
I suppose in a way, mildly curious about how it's going
 
Old 21st November 2018, 08:31 PM   #10076
cbdb is offline cbdb  Canada
diyAudio Member
 
Join Date: Oct 2008
Location: Vancouver
Quote:
Originally Posted by john curl View Post
As an audio manufacturer, my 'bias' should be obvious. However, I want to thank 99 and Jakob for putting straight facts about ABX testing forward here in a learned and thoughtful way. Of course, it should be obvious that ABX testing gives false negatives, and we have stated that for the last 40 years, but some people are 'biased' toward wanting audio products to all sound the same, and they will promote ABX even when it gets in the way of progress.
Yes your bias is obvious. What's progress? For someone who makes money from selling audio gear progress is selling more product. And marketing and all the BS they spew is whar matters, not the truth. So why would these people want ABX testing to show there full of BS. And JC has figured this out. If people really new that good amps are indistinguishable ( as Pavel is proving with his tests) why would anyone buy his over priced amps? So he has a vested interest in promoting audiofoolery like the bybee crap.
 
Old 21st November 2018, 08:46 PM   #10077
mmerrill99 is offline mmerrill99
diyAudio Member
 
Join Date: Aug 2014
Quote:
Originally Posted by scottjoplin View Post
I suppose in a way, mildly curious about how it's going
Wow, I didn't expect an interest (even mild) in the working of auditory perception & the latest research from you!

Here's the intro to that paper - tell me if anything in it sparks your interest
Quote:
"We perceive the world as stable and composed of discrete objects even though
auditory and visual inputs are often ambiguous owing to spatial and temporal
occluders and changes in the conditions of observation. This raises important
questions regarding where and how ‘scene analysis’ is performed in the brain.
Recent advances from both auditory and visual research suggest that the brain
does not simply process the incoming scene properties. Rather, top-down
processes such as attention, expectations and prior knowledge facilitate
scene perception. Thus, scene analysis is linked not only with the extraction
of stimulus features and formation and selection of perceptual objects, but
also with selective attention, perceptual binding and awareness"
Just in case people think this has nothing to do with listening to our playback systems, an auditory scene is exactly what is the intended illusion meant to be created by the playback system.

Last edited by mmerrill99; 21st November 2018 at 08:59 PM.
 
Old 21st November 2018, 08:50 PM   #10078
john curl is offline john curl  United States
diyAudio Member
 
john curl's Avatar
 
Join Date: Jul 2003
Location: berkeley ca
Hang in there, 99 and Jakob. Maybe the ABXers will start their own thread. '-)
__________________
"Condemnation without Examination is Prejudice"
 
Old 21st November 2018, 08:57 PM   #10079
jneutron is offline jneutron  United States
diyAudio Member
 
jneutron's Avatar
 
Join Date: Jan 2004
Location: In fear
Quote:
Originally Posted by scott wurcer View Post
Some of what is stated here is not new, I would like to see jn chime in on the apparatus shown (fairly sketchy description).
Their apparatus is changing the coupling by the use of eddy current dragging. The conductor spins, the magnetic field is dragged in the direction of rotation. I didn't really like their use of sqr(x+y) for their magnetic field drawing, as north and south are not shown, just an absolute quantity.

Here however, is the crux:

From their paper: page 213903-4 bottom right:

Quote:""
The use of a moving conductive material to break
magnetic reciprocity boils down to the Lorentz force that
the free electrons of the conductor experience as they move
through the magnetic field. In principle, one could replace
the mechanical movement of the whole material by an
externally applied electric field, which would force the
electrons to move with a constant mean velocity in the
conductor according to Ohm’s law.""end of quote

The first part, that is the eddy current dragging. It is a consequence of a conductive surface being dragged through a magnetic field, the conductor is generating eddy currents.

The second statement, they are saying that in principle, it is possible to replace a moving conductive surface that has eddy currents within by a non moving conductive surface that has current flowing .

Hmmm. I suspect that pair of sentences is where they may be mistaken..

edit: as the copper enters the field location, the eddy currents are circular, the electrons are moving in circular vortices. In a still conductor with current, the conductor will have forces. In their design, it will try to rotate as the outer side will be forced up, the inner down. Nothing in their writeup indicates that the magnetic fields will warp as they show in the rotational simulation with current in place of moving copper. And, they need electron velocities of what??

As to it being a magnetic diode, well, I'm more than a tad skeptical. How they got from this writeup to "one magnet pushes the other, but the other doesn't push back" is pure fiction.. They have a name for that in science fiction, it's called a reactionless drive. I believe Larry Niven used it a lot.

jn
__________________
I hate all these smart gadgets..I refuse to buy things that are smarter than me. I've made a list of those things... Cabbage just made the list.

Last edited by jneutron; 21st November 2018 at 09:15 PM.
 
Old 21st November 2018, 09:17 PM   #10080
simon7000 is offline simon7000  United States
diyAudio Member
 
Join Date: Nov 2008
Location: Oakmont PA
JN,

Next are you going to diss the magnetic monopole?

Just for humor, being a cheap bstrd I still use an iphone 4. It started dragging on data and finally gave me the black screen of death. So I just put the phone in the freezer overnight and now it works fine!
 

Closed Thread


John Curl's Blowtorch preamplifier part IIIHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


New To Site? Need Help?

All times are GMT. The time now is 10:00 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio
Wiki