Fidelity Research FR64s Headshell dilemma

No pivoted arm can reproduce the soundstage transparency and accuracy of a linear tracker

That’s quite a claim! What arms have you used to test that belief? In particular, I’d be interested in which 12-inch arms you’ve tried.

It’s not a claim, it is science. Less tracking error means there are less phase errors, less phase errors result in a more accurate reproduction of harmonics and more accurate phase and time, resulting in a more accurate and transparent soundstage.

You don’t say. And yet....

Every pivoted arm as it swings across a record has two points at which it is perfectly tangential. If the above is true then the "soundstage transparency and accuracy of a linear tracker" would be achieved, even if only at those two points.

Every record, as its played the sound stage will become more and more transparent and accurate, then less and less, then more and more again. If its such a big important difference then everyone would notice. No one would need to be told about it.

Is that the case? Not at all. In fact it seems the only people talking about this at all are promoting linear tracking arms as being so great - at solving this problem no one else cares or even knows about.

Therefore, the statement "No pivoted arm can reproduce the soundstage transparency and accuracy of a linear tracker" is what scientists and logicians refer to as, and pardon the technical language, BS.

dover

It’s not a claim, it is science. Less tracking error means there are less phase errors, less phase errors result in a more accurate reproduction of harmonics and more accurate phase and time, resulting in a more accurate and transparent soundstage.

The science is indisputable, of course. Tracking error is measurable and the geometry is actually pretty simple.

... as long as there is tracking error your soundstage reproduction is compromised for the above mentioned reasons.

Do you realize that your favored Eminent Technology ET2 is also subject to tracking error?
millercarbon

Every pivoted arm as it swings across a record has two points at which it is perfectly tangential.

Underhung arms have also been discussed here. They are tangential at only one point along the arc as the arm swings across the disc. Yet some who have heard them praise their sonics, suggesting achieving fidelity from a pickup arm involves much more than just reduction of tracking error.

... Every record, as its played the sound stage will become more and more transparent and accurate, then less and less, then more and more again. If its such a big important difference then everyone would notice ... Is that the case? Not at all. In fact it seems the only people talking about this at all are promoting linear tracking arms as being so great - at solving this problem no one else cares or even knows about.

That pretty much sums it up.
It would be interesting if @dover ever auditions an underhung arm. I plan to do that when the Covid era ends - just out of curiosity. I’m happy with my conventional pivoted arm.

Nandric, did you chase people off again?

Karma....

Karl D, not sure you'll see this, but I have a decent KSP sitting in a box waiting for me to figure something out...so I just bought a very nice FR 64S in a general auction (it was mounted on a Luxman PD-441 table)...and I have a PD-444 too...

I'm going tp try the RSP with the FR64s on the 444...not sure what that sauce will sound like.

Q: what head shell did you end up with for the FR64S? I looked at your gear and see that you've moved to a Kuzma TT, et al, so just wondering, as my experience is nil on all of this. Thanks. M-

KSP...I mean, Koetsu RSP.