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Löfgren B (null points 70,3 and 116,6mm)

Minimizes distortion in the area between the null-points, resulting in the lowest average distortion at the

expense of slightly higher distortion at the start and the end of the record. Compared to Baerwald you’ll have

more accurate tracking between the null-points, but less accurate tracking and more distortion at the very

beginning and very end of the record. We recommend this for modern jazz, pop and rock records where

there is less musical content on each side (less than 20 minutes) so only two thirds of the record are covered

by grooves, and the most important songs are typically found between the null-points. Null-points at 70,3

and 116,6mm, both are shifted more towards the middle of the record to optimize this area for playback.

Here we can see the same condition as before, but the geometry is Löfgren B. Because the inner null point is

shifted more from the centre, we got a more considerable tracking error at the end of the record and, with it,

related distortion higher. But the integration of the distortion on the whole record will be lower than in the

previous case.

Stevenson (null points 60,3 and 117,4mm)

A variation which is optimized for lower distortion at the inner grooves, by moving the inner null-point more

towards the inside. In classical music the closing big climaxes occur exactly while the stylus is approaching

the end of the grooves (the most inner groove). This results in the biggest challenge for the cartridge, just as

the playback conditions are worst. Some records are close to the theoretical maximum of 25 minutes, and if

done carelessly even longer and the grooves are covering the record up to the innermost part. This is true for

classical music, operas, live concerts, where a piece of music is so long that it is difficult to get it on one side

and you want to avoid a cut and putting the rest on the next side. Null-points at 60,3 and 117,4 mm,

meaning also the outer point is pushed outside, towards the beginning of the record, resulting in less

tracking error and distortion at the very beginning of the record.

Содержание Align it DS3

Страница 1: ...Pro ject Audio Systems Pro Ject Align it DS3 Revision 2022 10 14 1 INSTRUCTIONS FOR USE Cartridge alignment tool Pro Ject Align it DS3...

Страница 2: ...ro Ject Align it DS3 Revision 2022 10 14 2 1 Spindle hole 2 Cartridge tangency adjustment outer null point 3 Cartridge tangency adjustment inner null point 4 Mirror 5 Tonearm length for each alignment...

Страница 3: ...lowered and follows the curve If it does not adjust the cartridge position on the headshell To do this lift the tonearm loosen the headshell screws a tiny bit move the cartridge forwards or backward o...

Страница 4: ...PRO come aligned with 18 5mm overhang X2 B with 18mm overhang Check your turntable s manual for the factory adjusted overhang and don t worry if your factory fresh turntable doesn t align by default w...

Страница 5: ...e Works universally well for many musical tastes Lofgren B Minimizes distortion in the area between the null points resulting in the lowest average distortion at the expense of slightly higher distort...

Страница 6: ...ignal in case it is not perfectly aligned 2 Tracking error versus radius of the groove versus distortion Bearing in mind that distortion ABS 50 x tracking error groove radius we can easily calculate t...

Страница 7: ...centre we got a more considerable tracking error at the end of the record and with it related distortion higher But the integration of the distortion on the whole record will be lower than in the pre...

Страница 8: ...arc path is purple in color And on the arc lie two points where the green line orthogonal to the axle of the cartridge intersects precisely the center of the record These points are called null point...

Страница 9: ...manufacturer accepts no responsibility for damage caused by not adhering to these instructions for use and or by transportation without the original packaging Modification or change to any part of th...