The importance of azimuth


Not a particularly sexy topic, I know, but I recently had a rather ear-opening experience with my VPI Aries 2/JMW-10/Denon 103D. I been enjoying playing records for hours--sometimes days--on end during the few weeks I've had the new 'table and arm (the cart I've had for years). But after endless tinkering with the VTA (adjustable during play--perfect for neurotics like me), even at the "ideal" setting for any given record, there was an unpleasant edge to the sound. It was almost as if everything was digitally remastered!

Needless to add, this was not exactly what I'd hoped for in a record-playing system, though it *still* sounded leagues better than my digital rig (Sony SCD-1), even with the latter playing SACD (no, it does *not* sound as good as vinyl--not yet, anyway). I added some damping fluid. No audible change.

Then it occurred to me (duh!). I'd only made a token adjustment of azimuth when I'd set up the 'table. It looked straight, the channels were well-separated and balanced, and basically I didn't want to screw around with it.

Big mistake. (I'm sure you were all mouthing those words already.) A loosening of the set screw and a bit of twisting, and...everything looked the same. Stylus descended to record...drum roll...oh...my...God! Voices and instruments beefed up and acquired shape, tape hiss magically appeared (where appropriate), and hard left and right images seemed to float about a foot outside the speakers.

I'm sure there are more scientific ways of setting azimuth, but I'm now in one of those situations where everything sounds so fulfilling of my expecations that I don't want to lose it.

Folks, never forget that in set-up *everything* matters. These are tiny increments of adjustment we're talking about here. Take care with everything and your hardware will reward you with the gorgeous sound we know is inside those records.
bublitchki

Showing 9 responses by dougdeacon

Rcrump's fascinating post and Albert's response got me started poking around. I found this methodology for setting azimuth by measuring crosstalk in the VA FAQ's:

http://www.audioasylum.com/audio/vinyl/messages/138751.html

Not ideal, since it measures at the speaker terminals and therefore measures preamp/interconnect/amp/RFI imbalances, but certainly better than just eyeballing it. Comments anyone?
Nice post Bublitchki, and a good reminder for us all.

My VTF experience is similar to Albert's (except for the Walker part!). My Shelter 901 is exquisitely sensitive to very small changes in tracking force. Changes of .03g or even less are very audible. The best force can only be found by listening and it changes with any significant swing in outside temperature. (Yes, my home is heated.)

During the January cold spell it wanted 1.94-1.96g. With daytime temps now all the way up to 35F, the Shelter wants to see 1.90-1.93g. When the hot weather of summer returns I'll be down around 1.80g. These changes have a big effect on HF extension/cleanliness and the amplitude of dynamics.

Like Albert I have a digital scale that measures to .01g, though mine was much less expensive than the Winds. I've also got a mod on my OL Silver that allows instant VTF adjustments over a .15g range without moving the counterweight. Very handy with such a touchy cartridge. There are no rubber parts anywhere in the arm, so any setting that I choose tends to be pretty stable.

Gosh, if we weren't fretting over stuff like this, think how much damage we could be doing in the real world!
Albert, I quite understood that Bob was describing an electronic device. Were you perhaps responding to Jphii's suggestion that he could make one? Like you, I doubt that his woodworking skills would suffice, formidable though they be! :)

Thanks for finding Wally's device. I'd quite forgotten that he offered (offers?) that. It precisely addresses what we've been discussing, and his instructions cover the channel imbalance issue raised on the VA thread too. I'll be emailing Wally to find out if it's still available.
Guess I don't need to bother Wally, his Analog Shop is on the Acoustic Sounds website along with all his other tools. Hey, I enjoy talking to myself in public!
The assembly of my Shelter is visibly off-perpendicular relative to the body. Like 4yanx, I've done the best I can getting it perpendicular by eye using a mirror, but I've never achieved silence on the crosstalk tracks either.

Wally's Analog Shop, as referenced by Albert Porter above, measures crosstalk at the speaker terminals. That should better what we can do by ear. $400 including a copy of the Cardas test record. Very tempting. Can anyone think of a reason NOT to buy it (other than the price of course)?
David, count me in. Time to party!! Or, whatever you do with a customized multimeter.

Jbatlanta, I'll try to temper Rcrump's response a little, but both my partner and I DO hear VTF changes as small as .03g, and very easily. And contary to finding this onerous to deal with, we enjoy it. It's a hobby!
Me three. From the chat on VA it seems like we may be waiting for months. David, I trust AS didn't hit your credit card. I don't think it's even legal for them to charge you before they ship.