I'm talking about Ancestor. First problem, transparent shell (go with opaque). Bad resonance and because they use strong glue to secure the connection between shell and driver cover, if you try to detach the driver you'll probably break the lip of the shell. 2nd issue is a bad way of tuning the driver. They cover half of the horseshoe black filter with glue, which block the back sound wave of the driver. This affect the mids mostly and some details in treble.Another option would be the even cheaper Iris Ancestor.
With very simple filters combo you can get 20-30% improvement which is very fascinating considering that this driver is worth probably $1.
I managed slightly better tonality than with Snow Lotus CE, probably because of advanced mod.
On the other hand, SL CE has 64ohm, better technicality and yes, is older driver but still one of the best 64ohm driver that I tried so far.
15.4mm DIY 64ohm full Ti and 14.8mm DIY 64ohm N55 have better specs but they sound worst. K's 64ohm is probably a step above SL CE.