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There's definately no consensus here. This is an excerpt from needlz.com (aka Shure, they make it)
-Spherical - The diamond is shaped like an upside down traffic cone. The front view and side view are equal. Spherical diamonds have the largest surface contact with the record groove, resulting in lower pressure per square inch, lower record wear, and acceptance of heavier tracking forces.
- Elliptical - The diamond is shaped like an oval traffic cone. The front view is 3 times wider than the side view. Elliptical diamonds have smaller surface contact and higher pressure per square inch. Elliptical diamonds yield more accurate high frequency response, but are NOT suitable for scratching.
Which in my opinion is partly wrong, because the elliptical one has more contact surface for sure.
There have been numerous discussions about this topic, and nobody ever came to a conclusion (just read this : http://www.futureproducers.com/foru...&threadid=18587 )
My opinion on this is, most explanations you find are relevant to record playback.
An elliptical needle tracks better in normal play, but it's worse than sphericals with back cueing. Looked from above, an elliptical needle really doesn't look like a perfect "american football", but more like a rounded triangle (it's not as "pointy" at the back side. That is why in scratch or heavy duty backcue applications sphericals are preferred (and they fact they cost less to produce also of course). The best scratch needles are still spherical. This is why I also say, an elliptical needle produces less wear in regular use, but in scratch/back cue applications to have the same performance as sphericals, you need more weight, which results in more wear.
The problem is, not only the shape is to be taken into account. Also the mass, which will cause inertia (and that will cause skipping) and the cantilever system. No point in saying that the cantilever on a Shure M44-7 is the most exemplary part of all.
We all agree on one fact, elliptical sound better. The general consensus still stands as : if you are mainly mixing, and sound quality primes, go elliptical. If you're scratching, go spherical.
Really you shouldn't think there is a world of difference in the record wear. It's not like it practically destroys your records. In the long long long term you might notice a difference.
What you shouldn't do though, and causes massive wear, is constantly switching between two "models". When you play with a certain needle, the groove is slowly shaped (as the vinyl is rather soft, the needle warms the vinyl and shapes/scrapes material from the groove walls). This is a natural process. If you suddenly change from one method to another, the groove that was shaped to a certain point will totally be "off" to the new stylus shape. And that one will really eat up your records then.
It's ok to use spherical for normal play, and use elliptical for recording, as it's just a momentary pass. But definately don't constantly switch from one to another (like play 6 months with S, then 6 months with E, then S again, etc...) cuz that will destroy your records.
I definately encourage you to read that long discussion on Futureproducers I posted in this reply. Shows you that after long discussions, with very valid points on both sides, there is still no conclusion...
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