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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
128x128dougolsen
actusreus
733 posts
 
Elizabeth, I always enjoy your advice. Do you know how to precisely use a voltmeter (or a multimeter I can get for about $20 from Ace Hardware) to adjust azimuth?
I was told you put the leads to the speaker's terminal but mine are bi-wired and I'm still confused about the DC/AC current selection. I checked out the Fozgometer and it looks very straightforward to use; so straightforward in fact that I'd be probably willing to spend $250 to get the damn azimuth right once and for all...
jtimothya
612 posts
 
Actusreus - use your amps terminals rather than your speakers. With a voltmeter set to AC, the 5V setting should do nicely. Also you will need a test record. Below is a link to an A'gon write-up I did a while back - there is nothing unique about it. I've only seen pictures of the Fozgometer, but using it will involve essentially the same technique as a voltmeter and the latter will be less expensive.

Some cartridges more than others are sensitive to less than optimal azimuth. Unless you have a Graham or Triplanar or other tonearm sporting a good azimuth adjustment interface, then adjustment can be a bit fiddley but once you've done the voltmeter technique a couple times, its pretty easy to iterate across multiple adjustments to fine tune the crosstalk and get things nicely dialed in. Dougolsen gives a good description of the characteristic benefits of proper azimuth. I find it worth the effort to get the readings so I can gauge if adjustment is needed and have the peace of mind in knowing. Good luck with your cartridge setup!

Using a voltmeter to adjust azimuth
actusreus
733 posts
 
Thank you very much Jtimothya! I actually do have a test record so I'm more or less half way there. Is it me, or is the azimuth one tricky bastard?:)
lewm
13,418 posts
 
I first realized the importance of proper azimuth adjustment when someone demonstrated it to me using his Triplanar tonearm. From that point forward, I lusted for a Triplanar. For a very good treatise on azimuth, how to adjust it, why you are adjusting it, what to expect, etc, I recommend a search of the Vinyl Asylum archives for long posts by B Kearns and by V Khomenko (sp?). Those guys are my bible on this subject.

By the way, I own a now antique Signet Cartridge Analyzer which, if you have the right test LP and a Triplanar, makes setting azimuth a breeze, using the direct output of the cartridge itself, which eliminates the possible effects of downstream amplification. But the Signet does not quite have enough input sensitivity for a modern LOMC cartridge output. It needs an antecedent gain stage.
istanbulu
291 posts
 
I too appreciate the info and perspectives, but I'm left wondering what everyone's thoughts are as to the usefulness of the Fozgometer which at the outset of the thread seemed pretty useful but now I'm not so sure.

Could someone clarify this for me... much appreciated,

:) listening,

Ed
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