Al ears said:It's the generators that are silver-wound in the Ortofon and not the interconnects - supposedly a big improvement according to Pro-ject (as the Silver is solely theirs).
If you are happy with the sound you are getting from the PL12 D why not simply spend the money on a cartridge upgrade?
An Ortofon further up the price range should bring vast improvements over the basic Red.
Just a thought. 🙂