Something else to consider.... - John Elison

Vinyl Asylum

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Something else to consider....

Posted by John Elison (A) on April 28, 2007 at 04:38:19

In Reply to: How to measure tonearm mounting distance? posted by David Lawrence on April 27, 2007 at 21:36:14:

You might want to consider the type of alignment you wish to employ before deciding on the mounting distance. The geometry used by Grace has an alignment that looks like this.

This alignment has low distortion in the middle and inner groove area at the expensive of rather high distortion over the outermost one-third of the LP. This is shown by the red line, which incidentally is weighted such that a given level of distortion on an inner groove is exactly the same as on an outer groove.

If you would like an alignment that minimizes and equalizes the distortion across the entire LP, you might want to mount your tonearm slightly closer than 222-mm. Here is what Baerwald's alignment looks like for a 237-mm effective length tonearm, which requires a mounting distance of 219.5-mm for optimal results with your Grace 707.

A measure of overall distortion across the entire LP playing surface is given by the number in the turquoise square in the upper left corner of the graph. This is only one indicator to consider. You also need to assess the red curve, which shows distortion at specific positions on the LP.

As you already probably know, I prefer Baerwald's alignment because it does not favor one portion of the LP over another.

Good luck,
John Elison

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Follow Ups Full Thread

Topic - How to measure tonearm mounting distance? - David Lawrence 21:36:14 04/27/07 (11)

Thanks a lot (NT) - David Lawrence 14:01:03 04/28/07 (0)

Re: Like this - Damián 05:33:21 04/28/07 (1)

necessity is the mother of invention - dean man jim 07:35:05 04/28/07 (0)

Something else to consider.... - John Elison 04:38:19 04/28/07 (3)

I used to think this sort of thing mattered :-) - Dave Pogue 05:54:27 04/28/07 (2)

Did you borrow this from Jean Nantais? - tubesforever 09:13:00 04/28/07 (1)

No, from another friend. - Dave Pogue 10:03:34 04/28/07 (0)

Simple as can be.....here goes.... - tubesforever 00:37:46 04/28/07 (0)

It ann't rocket science - jnorv 22:19:27 04/27/07 (1)

Re: It ann't rocket science - Tubey-wan 09:00:06 04/28/07 (0)

you could... - analog guy 22:14:10 04/27/07 (0)

Follow Ups

Something else to consider.... - John Elison 04:38:19 04/28/07 (3)

I used to think this sort of thing mattered :-) - Dave Pogue 05:54:27 04/28/07 (2)

Did you borrow this from Jean Nantais? - tubesforever 09:13:00 04/28/07 (1)

No, from another friend. - Dave Pogue 10:03:34 04/28/07 (0)

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