That's what I thought too. An important statistical question:. Are enough samples taken to measure the average of the random variable? I doubt it. If not, the measurement is meaningless.
I think it was AnalogMagic who made the remark that phase in crosstalks measurements is meaningless, but without elaboration. So I decided to do some further investigation by measuring crosstalks traces at different times. The outcome is summarized in the attached photo. What are your thoughts...
Thank you for the very enlightening reply.
First I am in total agreement about the complexity of how the different adjustable parameters are intertwined and can affect what many could hear. Not dissimilar to how the stock market can be affected by the web of correlated economic factors Greed...
Hi JR
With your sophisticated equipment, I hope you can shed some light on:
When a particular tonearm height is changed by say, 2 mm and other values, how much is the height of the rear end of the cantilever has changed for a particular cartridge? That will be an interesting academic exercise...
Me too. The entire purpose of my post was to alert people not to religiously follow that 4mm is equivalent to 1 deg, especially when they think they have measured SRA "precisely" using a microscope. It's been repeated by many others that all adjustable parameters are inter-related and changing...
The only point I was trying to make is only geometrical: changing tonearm height by 4 mm does not mean SRA changes by 1 deg. I totally agree that the difference we hear is due to change in VTF, azimuth, zenith, etc. But the exact explanation probably is too complex an issue for all of us to...
To address your first point. When the tonearm height changes and the stylus remains in contact with the record surface, the cantilever must rotate somewhat when the suspension is not a RIGID point. If it were rigid, the rotation of the tonearm about its pivot will have to totally accomodate that...
Since my post above, few friends expressed they had difficulty to understand the math involved. It is actutally quite simple, but I did not do a good job explaining it. So I decided to tidy up the write-up. Here it goes:
Tonearm Height and SRA
It’s been widely accepted that changing a 9”...
I did a quantitive ESTIMATE, as guideline only, on the quantitive relationship between SRA and tonearm height. Please see:
https://www.whatsbestforum.com/threads/tonearm-height-sra-misconception.35324/
First, we need to get one fact straight. As long as there is an overhang beyond the spindle, there are TWO null points. If the spindle to pivot distance is slightly "off" from manufacturer's specification, we get just one null point using HIS protractor. However, you still have another null...
It’s been widely accepted that changing a 9” tonearm’s height by 4 mm will approximately alter the SRA by 1 degree. This contradicts valid – to me - claims by audiophiles that they can hear the difference when the aforementioned height changes by a fraction of a mm.
Bear in mind the tonearm +...
The day that AI can take over should not be too far away: we will then get perfect coils alignment, stylus mounting on cantilever, and precise attachment of the latter to the body. Audio Technica, Ortofon, .. should have the resources to go that way. Maybe already.
The reason why you could only get the cartridge body aligned at A and not ta B is that the pivot-spindle distance is off. The null points on your protractor are not those for the pivot-spindle distance you've got. This is straightforward trigonometry.
One way to overcome this without drilling a...
One thing I never understood is the phase difference measured by Adjust+ ranges from 0-180. Why not 0-360 or -180 to +180 deg? Traces shown on an oscilloscope are definitive.