Agree it's all about the contracts, now that it's sold out perhaps Zeos can tell us about it. But again I believe that the tuning is not exclusive to Zeos because it cannot be copyrighted when literally every brand has access to its graph, that's like trying to sue a competitor because their product sounded similar, if the physical design is similar then there might be a case which is why changing the faceplates while keeping the same tuning would work.

Which is why the suggestion is to drop the Z Reviews branding, the regular release of Dunu SA6 Ultra wouldn't have any production number. The analogy comparing it to collectibles only makes sense if it was priced at a premium because the opportunity cost of losing future sales is priced into the premium price, and usually collectibles are not too different from the regular product, meaning collectibles tend to be in a different colour but with similar specs, especially for electronics. Reason is because electronic products had to be updated with better specs as technology advances hence making the updated version a collectible wouldn't be sensible from business perspective. It wouldn't affect Dunu's PR even if they choose to release new batches because there will be more than 300 people who are interested in it and ultimately in business the decisions are taken to satisfy majority of customers. In fact, not continuing the SA6 Ultra would be bad PR and it affects Dunu's revenues which is crucial for their R&D costs.

The design of the box would be the easiest change, people wouldn't be bothered even if it's a plain box with the name on the front and specs on the back, just drop the Dekoni tips, all other accessories would remain the same. Change the faceplates since the red and blue faceplates are associated with Z Reviews. The point being it should never be made limited regardless of new batches. The tuning is not exclusive, everyone can see the graph and other brands can even copy it. The agreement is drafted to Dunu's advantage, Dunu has the full control of their product, that's how collab works.

It is limited because Dunu only had 300 pieces of blue and red faceplates, but Dunu can easily recreate SA6 Ultra with different faceplates, name, and without the Z Reviews branding and accessories like the Dekoni eartips. The original SA6 is in need for an update and it just doesn't make sense for the updated version to be limited. No brand has ever made updated version limited, imagine if the Blessing 2 Dusk was limited it wouldn't make sense. Every brand has capitalized on their popular products, just look at the number of versions on Shuoer S12, Tin Hifi P1, even the 7Hz Timeless will be releasing a new AE version, all these updated versions from various brands are not limited. Dunu would not waste this opportunity to capitalize on their most popular product, it's in the nature of businesses for their survival. The regular release can be named SA6 Ultra but with different packaging, without the "x Z Reviews" on the box and different faceplates. Do wait a few months for the regular release of Dunu SA6 Ultra.