Does "perfect alignment of cart" eliminate 100% ?

There's no such thing as perfect alignment. All alignment tools are approximations only, and their accuracy varies as the cartridge sweeps across the record. Furthermore, the thickness of the vinyl influences the geometry somewhat and varies from LP to LP, so unless you are prepared to set the alignment for each LP, you might as well leave well enough alone.

Cheers

The March issue of Stereophile had an excellent, many page article entitled "LP Tracking Error Explained". There is no such thing as perfect alignment. It's all been pretty much guess work from the beginning. Just get as close as you can and listen to the music...that's what it's all about.

If you are using a pivoting arm, at best you might be close to "perfectly aligned" at only two points on the record. I would continue setting up the cartridge.

Dear Nolitan: In a pivot tonearm you can't eliminate 100%. If you want minimum distortion at inner grooves then align your cartridge/tonearm with Stevenson geometry.
If after that you still heard that IGD then maybe the tonearm or the cartridge or both are out of specs or are not a good match between them.

Regards and enjoy the music,
Raul.

Thank you for the replies. Which protractor uses the Stevenson geometry ?