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Azimuth observations and importance

After adjusting azimuth with a Fozgometer loaned to me, the following is what I observed. Individually, these changes were subtle although noticeable. The combined effect however, was significant to the overall presentation.

Imaging improved.

Vocals became more focused, not as big and wide as before.

Instruments more detailed with greater air. Location is more precise.

Tighter bass versus the slightly lingering bass notes previously.

Better top to bottom detail and clarity.

I never realized how important correct azimuth adjustment is and this exercise was quite a learning experience for me. Thinking I was correctly adjusting azimuth by visually setting the headshell as level as possible was a reasonable but flawed attempt.

I have found at least two stylus issues that if present will affect azimuth and sound.

1) A straight cantilever that is twisted left or right changes the attitude of the diamond and its relationship to the groove. By twisted I mean the cantilever has rotated on its own axis. This one is very difficult to see without appropriate magnification.

2) A cantilever that is canted to the left or right a degree or more but is still straight, not bent. It points left or right probably because it was not centered correctly when the cantilever was installed. It also changes the attitude of the diamond.

What is probably basic and common knowledge to everyone here is something I have just been enlightened about after giving it very little thought. I am now convinced that accurate azimuth is a required step in the turntable set up process and I will be giving full attention to this part of the equation.

No more guesswork and eyeballing which I am embarrassed to say was the norm. Doug
dougolsen

Showing 2 responses by doctorcilantro

doctorcilantro
59 posts
 
Interesting. I have question for you all.

I'm about the setup my new table and I use a phono stage with dual independent volume controls (flat gain mic preamp in to PC).

Do I need to generate a loopback (since I use a PC) with a digitally generated test tone, or is the tone on an LP going to be one the LP perfectly balanced on both channels?

See what I'm getting at?

My thought is to use a multimeter to make sure the output is the same first, then physically adjust azimuth.
doctorcilantro
59 posts
 
I guess my thinking was to balance my phono stage (uncommon for most I guess) so that when I do the Ultimate Test Record azimuth test, and won't have to worry that my phono stage is not introducing any error into the test.

I got a little confused; I am using the UTR and I forgot they have left/right channel only for azimuth. I'd like to set it up first with UTR, then listen to music (before/after):

Side 1
General Reference Level
This 1 kHz reference tone will allow you to establish a “base level” for all measurements.
Track 1 1Khz reference tone 7cm/s Mono, in phase (Lateral)
Basic reference for all measurements, adjust meter for maximum convenience (in the studio 0VU).
Adjust preamp channel balance for equal output.
Also used to check the offset angle of the photo cartridge; L&R signals should be exactly in phase as displayed on an oscilloscope.

Azimuth Adjustment
Track 2 1kHz reference level Left channel only
Measure Right channel output.
Track 3 1kHz reference level Right channel only
Measure Left channel output.
The object is to sit the stylus exactly perpendicular in the groove.
Twist cartridge about its radial axis until the measurements from Track 2 and Track 3 are equal or very close to equal for both channels.
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