The IMR-R1 is what I thought the Phantom Hunter was going to be, but to my ears, at a much higher level when it comes to all around sound quality. The fit and isolation is better than the former no matter what tips I have tried. Am using the blue filters with my 8 Wire Litz cables connected to either my iPhone or Pono Player in balanced mode. With iPhone streaming Spotify and especially with my Pono Player, every song sounds like I am in the studio listening to the final cut being played live. The female and male vocals are so present I’d swear their standing right in front of me. There is certainly enough bass, even with my filter choice. With the port closed it seems the mids are more forward and there are more scales of treble available. And the soundstage is wider, feeling like the sound is surrounding your head. With it open it seems to be less bass and a more intimate soundstage. To me listening to the R1, the music is so clean, clear, and fuller with no distortion that I could notice. Am really satisfied to purchase the R1 and will be putting my other IEM’s in storage. This is exactly what I have been looking for in an IEM. I think Bob has a hit on his hands right out of the gate. I was looking to purchase either the CA Andromeda or 64 Audio U6 before the R1 became available. But for the price differance, the R1 is by far a great buy, and for the most part could compete with any of the other’s mentioned. I really can’t see spending more money for perhaps a few minute details.