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@earthtones : by coincidence I own that LP too and several others that are well towards the center.

I don't listened to that LP from years now I will try today and if I I have any trouble down there I will post it and if not I keep " quiet ".

With out listened yet and knowing my system I could think will be no trouble but.......we will see.

R.

or could be that your tonearm sample is out of specs.

@erthtones you can try to contact directly Peter looking for adcvise about and in the other side with SME too.

Do you already tested other cartridges in the 312S?, I think that you could do it and see what happens.

Btw, what happens  when at the inner grooves of an LP ( Classical. ) there is no those normal climaxes? any trouble down there too?

R.

Dear @earthtones : " Yes, it's got the extra length for lower tracking error, but I still hear inner groove compromises so that's why I'm looking seriously at linear trackers. "

Unfortunatelly and especially with the whole analog rig always exist trade-offs.
If it's real that a longer tonearm has lower tracking error it's true too that the cartridge/tonearm alignment must be super accurated because a minimum inaccuracy rpovoque even higher errors that in a shorter tonearm. In the other side in a longer tonearm the developed resonances/distortions are higher than in a shorter one.

With linear trackers exist trade-offs too like the opnes you named and others and one of those " others " is in the bas range ( specialy inl low bass. ) where almost any pivoted tonearm but unipivots are second to none and superior to the LT.

Now, those inner grooves compromises with a good analog rig and a high resolution system as your can be put at minimum where you can't detect it for this you need a good damped tonearm and a a cartridge with good tracking habilites. I don't know if the 312S comes with a trough for silicon oil damping as the SME V, this helps to better tracking and lower resonances.

Now and even that your cartridge/tonearm frequency resonance  has no problem your cartridge is a low compliance one and bad tracker that shows normally at inner grooves.

The tracking error in the SME and other tonearms is really small for been or develops that problem. I that been the problem then the 98% of audiophiles that use pivoted tonearms always have your problem and in my case in the last 10-15 years I left to have that kind of peroblem. LT can't fix it because the trouble is in the cartridge maybe only the one you own not all SS Susorro samples.

I have several cartridges that runs in pristine way the Telarc 1812 LP that is the most extreme challenge at inner grooves.

So, I think that your problem is not exactly at the 312S but somewhere down there.

If you want to go a head with a LT then could be " healthy " to test it before buy it at your place with your cartridge.

Regards and enjoy the MUSIC NOT DISTORTIONS,
R.  

Dear @earthtones : You have at least other very good alternatives with Thales, Reed and Shoroeder that designed pivoted tonearm that are linear trackers. 

Regards and enjoy the MUSIC NOT DISTORTIONS,
R.