Why can't Astell and Kern get the tuning ... with the regular editions and it has to be the "gold" limited release version that has it magical. Remember those SP2000 copper vibes? That magical timbre with the "x" factor? A subtle warmth and richness to the notes without any unpleasant troughs/peaks. The copper SP3000 seems unbalanced in tuning in comparison.
The differences are subtle. Not dissimilar to a cable roll. But if you can hear it, you can hear it.
I'm going to call it. The Gold edition is my preferred edition of the SP3000. With the SP4000 rumoured to be coming in the next. 6-12 months time will tell how the sound evolves.
Only because colour matching is a thing... Ice Labs Spectrumica, Eletech Sonnet of Adam with the SP3000 gold.