Interesting... I would expect a bass lift, but you ended up getting a bass drop instead. I would hope someone can do a teardown on the crossover. Nice video, Ian!
I'm guessing that's the adaptor that comes with the Zero: Red, which is supposed to boost bass. I've only tried it with the Red so far and found a slight boost to the low end, but didn't notice a difference in soundstage or airiness.
Im sorry asking out of the topic, but can you recommend me IEM-bluetooth module for me like AZ09 Pro, CCA BTX, or something else? Especially from the durability and water/sweatproof aspect Ill be grateful if you can help me 🙏😅