thank you.I bought a few China clone drivers, my suggestion is just go for the real deal knowles. These Chinese drivers trying replicate the original model and modifications. But very often they compromise on last 10-20% of the quality.
I bought bellsing and knowles ED29689. Bellsing sound flatter, but you still need to use orange filter to get the low frequency. The bright mid of knowles is lacking in bellsing. It turns out that bellsing is neither here nor there.
I also bought knowles RAB 32257, bellsing 32257 and the seller you mention single driver 32257 and dual driver 32257. Bellsing’s sound stage is narrower and messier, and the high has more roll off. The Taobao single 32257 is way flatter, smoother, I haven’t fully try it out yet because I spend my time on next 2 drivers. The Taobao dual driver is very bassy but the high is very roll off even without any filters. It has a lot of dip after 4kHz, male vocal very forward, female is laid back, some electric guitar is loud, and some very high frequency is roll off. Quite a messy replica.
And it bring back the knowles 32257. The bass is very punchy and well control. The mid is forward and high is very bright, I used grey filter to control the sibilant a bit. There’s minimum or no roll off on the high. I wouldn’t want to use white filter as it might make the bass too overpowering. Not that I didn’t remove the vent filter yet, and the bass is already very strong.
End of the day, just get the real knowles Drivers. You won’t regret it. The only time I’ll suggest to get a China clone driver is when you really very unfamiliar with diy iem. Personally I destroyed 1 or 2 pairs of drivers. Now I feel more confident in making my own iem, that’s why I changed to use knowles drivers.
I just start making DIY iem, I think maybe imma try them before going to knowles