This spreadsheet…
What is you tonearm’s Maximum Distortion?
I’ve been playing around with different cartridge mounting, as a Grace arm the plinth of my Lenco cannot be mounted at the recommended pivot-to-spindle distance of 222mm (closest it can get is 225mm).
My best figures in theory seem to be:
Max. Tracking Error: 3.51 degrees
Max. Distortion: 1.21 %
Average RMS Distortion: 0.73 %
This is with: P-t-s 225mm; overhang 11mm; offset angle 19 degrees.
What are your figures for your setup?
are the three quoted sets of numbers referring to the same setup? Like Lew, I am skeptical of the accuracy of the 'calculated' distortion numbers since the whole description is to vague. @nrenter posted a screen grab to John Ellison's Excel spreadsheet. which can be found on the Enjoy the Music site. This file has the description below of what the calculated percentage distortion refers to.
dave |
Since we are considering the theoretical, your proposed alignment simply looks like Löfgren A if you cheat the inner groove radius to 75mm and the outer groove to 143mm which is not realistic for all but the smallest selection of music. Distortion at the 60.325mm inner groove point will be a fair bit over 2% dave |