Hasmarto, a few thoughts, my perspective only.
The issue about warrenty is a straw dog. Most audio gear has no more than a one year warrenty anyway so that may have little affect on used values.
Overall brand reputation has a big influence. Case in point the Dunlavy speakers. But in that case the same brand of replacement drivers is not a complete answer. I'm not sure about DAL speakers but Duntech Audio utilized matched drivers - with one another when paired and as fine-tuned by the crossover. So simply replacing with the same part number might not insure original performance.
Then there is the question of the same designer/owner ending one brand and starting another. At least they might advise on any necessary repairs. The Threshold/Pass example is a good one. And what about Carver? He has had at least three companies; what has been the used values for his products?
The issue about warrenty is a straw dog. Most audio gear has no more than a one year warrenty anyway so that may have little affect on used values.
Overall brand reputation has a big influence. Case in point the Dunlavy speakers. But in that case the same brand of replacement drivers is not a complete answer. I'm not sure about DAL speakers but Duntech Audio utilized matched drivers - with one another when paired and as fine-tuned by the crossover. So simply replacing with the same part number might not insure original performance.
Then there is the question of the same designer/owner ending one brand and starting another. At least they might advise on any necessary repairs. The Threshold/Pass example is a good one. And what about Carver? He has had at least three companies; what has been the used values for his products?