I put the NarDa and NarCa clones away because of the annoying whistling. They’re in my PIF box at this point. I read that filing down part of the airflow holes fixed it but I don’t have metal files and the desire when I have so many other great single coil RDAs
The NarEA has completely different airflow so i'm hoping that it doesn't whistle but glad I didn't go for the other two. And the originals were around 160€ i believe