This is the second post in a series dedicated to tonearm geometry. I will try to avoid repeating the obvious and the well-researched, focusing on things that are often overlooked. Korf Audio has done extensive proprietary research into the relative importance and audibility of these errors, and I'll share some of the conclusions.
In the previous post, we focused on the static errors -- they do not change as the stylus makes its progress from the outer radius of a disc to the inner groove, or change smoothly and gradually. Today, we'll focus on errors that appear as the tonearm traces the disc's wobbles, warps and bumps. These are:
- Scrubbing motion in horizontal plane
- Scrubbing motion in vertical plane
- Angular motion in both planes
- Motion in the frontal (azimuth) plane