Got a few cheap sonion drivers on taobao that I couldn't find datasheets for, checked impedance, and frequency response from an imm6, both with a short piece of 1mm tube and some tack to seal:
Neither look great, taken at the same volume setting on my sound card FWIW. The 20x53 has a decent curve shape but sub bass rolls off, the 23x62/3 looks hard to drive and not much on the top end, not going to beat out a knowles rab or raf based on just looking at the graph. But might have their place in a multi driver setup. Anyway, in case you were curious about those, there it is.
Neither look great, taken at the same volume setting on my sound card FWIW. The 20x53 has a decent curve shape but sub bass rolls off, the 23x62/3 looks hard to drive and not much on the top end, not going to beat out a knowles rab or raf based on just looking at the graph. But might have their place in a multi driver setup. Anyway, in case you were curious about those, there it is.