I have done my own my own experiments.
Ferrites - used them on PSU's, T/C and strain gauge amplifier front ends to solve noise problems when I was designing instrumentation 25 years ago. Jim Williams (RIP) loved them as well. Now I use 'em in audio and they are solving problems and don't affect the sound.
What I do know though is that there is not a shred of good evidence other than opinion and peeking for claiming ferrites affect the sound negatively. Not one.
For goodness sake do a decent DBT or get an AP and do some tests and present some hard evidence, but don't make claims like 'it affects the sound negatively'
I'll step out of this discussion, because clearly you, Max, Frank (who doesn't seem to post here anymore), CH and others have a belief about ferrites that is not going to change.
Here is a link to a useful tool to help anyone wanting to get a handle on some aspects of EMI
Download | Murata Manufacturing Co., Ltd.
Another useful resource http://www.hottconsultants.com/
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Hi Steven
Those color graphs weren’t decay plots, there was no time axis in those.
They were directivity plots (X for frequency, Y for angle, color for sound intensity) .
Alexander I haven't seen a spectrum decay plot for M2
George
The M2-SPC.SPK plot is a decay plot (time axis included), and is a waterfall plot (sort of) seen from plain above.
Oh yes. Thanks Jacob.
I hadn’t noticed it. (*)
But not to confuse Steven, this M2 decay plot hasn’t been reproduced again here.
JBL Master Reference Monitor - Page 74
Testbericht - JBL M2 - Master Reference Monitor - Monitor für große Studios und Abhörräume / SOUND & RECORDING Ausgabe 12/2014
George
(*) And it is to the credit of the German testers that they show in detail the spectrum of the excitation signal (left side of the picture). I haven’t seen that again.
I hadn’t noticed it. (*)
But not to confuse Steven, this M2 decay plot hasn’t been reproduced again here.
JBL Master Reference Monitor - Page 74
Testbericht - JBL M2 - Master Reference Monitor - Monitor für große Studios und Abhörräume / SOUND & RECORDING Ausgabe 12/2014
George
(*) And it is to the credit of the German testers that they show in detail the spectrum of the excitation signal (left side of the picture). I haven’t seen that again.
Attachments
I'm with Bonsai on ferrites, still waiting for real evidence that they are detrimental, not just anecdotes. It does say a lot when believers in Bybee's say ferrites muddy the sound etc.
In fact i will go further, its a bloody joke when proven technology is dismissed and fantasy scam products (BQPs) are lauded...
So some real proof would be nice...
In fact i will go further, its a bloody joke when proven technology is dismissed and fantasy scam products (BQPs) are lauded...
So some real proof would be nice...
They did at least two times (and tried some more), see the Tiefenbrunn/Lipshitz example that SY mentioned. Another example were the challenge that Fremer accepted from David Clark. He did the test (conducted afair from David Clark) during an AES-Convention and succeeded (3 amplifier under test, Fremer got 5/% correct for same/different and volunteered additional 4/5 correct identifications of the specific amplifier model) . As roughly 100 other AES-members did the test and failed, Fremer was called the "lucky coin" afterwards, which was unreasonable from a statistic point of view.
Fremer again accepted Randi´s million dollar challenge wrt loudspeaker cables in 2007; to make a long story short, Randi weaseled out....
You´re Welcome!
Goertz developed (together with partners) the monkey forest measurement suite (now there is winmf too) and does the technical tests and description for quite a lot german magazines (at least).
Most likely the M2 was measured in their facility:
| Technical Facilities
They did- see the Lipshitz/Tiefenbrun tests. Unfortunately for the narrative, the wrong person heard the differences.
Your description is a quite good illustration to the bias i´ve mentioned.
Tiefenbrunn was subject to the test (according to Lipshitz description i would assume that he did not had any experience with ABX before) and the ABX-box in use was provided by Lipshitz/Vanderkooy and used before by them.
Again, according to Lipshitz description the box had a problem (i assume known to Lipshitz/Vanderkooy) with different relay click sound during the switching process from A to B (or X) not revealed before. In the Tiefenbrunn test Lipshitz noted after some tests a higher noise level with the Sony pcm processor switched in.
Boston Audio Society - ABX Testing article
I have heard different for both of those. Would be interesting to know the truth.
Especially so when those believers repeatedly state, apparently with dry eyes, that they come here to learn.
Jan
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You have heard correctly. The retelling and spin here from anonymous "contributors" is simultaneously sad and funny.
I bet you heard different....it´s the internet.
But wrt Fremer/Randi the emails were disclosed back then and some more information at the end of that story were gathered from official interviews Randi gave. So there is simply no different story to tell about the Fremer/Randi challenge; of course others were involved in the mumbo jumbo around, but that was not connected to the heart of the matter.
Wrt Fremers amplifier test, i´ve to sort some things out and will provide some more details in a couple of minutes (especially as SY´s comment is quite .... err...remarkable .... )
I sit quietly... my rarefied air system functioning nicely.
Of course the main concern is the half-life of rarefied air.
It presents a problem in as much as a proper test/measurement system to
determine accurately the % of rarefied air in the room is less than perfectly
accurate, up to the requirements.
I can say that there is little doubt in my mind that once one listens in a room
with a sufficient % of rarefied air that the experience without its presence is
never quite the same.
_-_-
Of course the main concern is the half-life of rarefied air.
It presents a problem in as much as a proper test/measurement system to
determine accurately the % of rarefied air in the room is less than perfectly
accurate, up to the requirements.
I can say that there is little doubt in my mind that once one listens in a room
with a sufficient % of rarefied air that the experience without its presence is
never quite the same.
_-_-
I read the emails. As far as I could see after the original company that were offering cables backed out there was a lack of agreement on the protocol which could not be resolved.
Yet Another Snag in Cable Challenge.
Of course people are open to interpret as they wish.
Yet Another Snag in Cable Challenge.
Of course people are open to interpret as they wish.
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