As for sound, my impression is that they are quite neutral and I can’t hear significant differences compared to other tips like the CP100. This is actually desirable, so kudos to SpinFit! Passive isolation is quite good, too: probably due to the relatively deep insertion and wide dome, the SpinFit W1 are quite successful at sealing off the ear canal and therefore offer great isolation. Final Thoughts The basic idea underlying every SpinFit eartip model is the following: traditional eartips have a straight solid core at their centre which stays so independently of the actual shape of the ear, but it would be better if the core could bend and follow the curves of the ear canal. This is what happens with the SpinFit tips: there is a point in which the silicone is thinner and therefore softer and it’s shaped like a doughnut, so that it can bend and provide better comfort. The trebles on the EM6L are really well extended. They are very airy and detailed. However, the detailed trebles come with their cons too. As such, the EM6L is a bit sibilant. It also doesn't compare to the Xenns Top, which has very well extended, extremely detailed, and quality trebles but presents them in a controlled and smooth manner. Hence, it is not fatiguing or overwhelming during long sessions. The Top also has better technicality and separations than the EM6L or the Khan by a huge margin (understandably as they belong in different price ratios). So the trebles sound better on the Xenns Top. The EM6L sometimes sounds fatiguing and piercing with treble-heavy songs.

Third-party eartips are one of those things that you end up with a large collection of as you fall deeper into audiophilia. The reason is quite simple: universal earphones (i.e. non-custom IEMs) require fiddling with the tips more often than not. Moreover, eartips are just about the cheapest (and often most reproducible) way of tuning an earphone. So we all end up with boxes of eartips of our own, sooner or later. Eartips do make a difference in our listening experience. They may not always have an influence on sound, but they do change the way you wear your earphones and this makes all the difference between listening to music while being comfortable and doing so while swearing against the pain in your ears. The SpinFit line-up is quite complete and gives you a lot of choice to get the eartips that better suit your needs, from very deep insertion to a very shallow one. All of them offer a great level of comfort, thanks to the soft silicone and to the incredibly clever design SpinFit came up with. SpinFit eartips are a game changer and can completely change (in a very positive way) the way you experience your favourite earphones.For neutral tonality with emphasis in bass, midrange and vocal. For clarity and bigger soundstage, choose CP-240. The mids are clean and uncolored, but I still prefer the mids from the Xenns Top because of its technical abilities, clarity, and control. When compared to the Khan, I prefer the Khan's mids because of the dynamic driver tonalities. Both the Xenns Top and the Simgot EM6L have a balanced armature tone to them.

Eartips manufacturers can frolic as there is no real competition between them: all their products are different and there is no universal fit for any earphone/ear canal combination. The SpinFit CP800 were the only ones I could not try due to not having compatible earphones: they are made for super-thin nozzles like those used by Shure, Westone and Etymotic. At just 2 mm wide, the inner bore is too narrow to house earphones with 4 mm nozzles (believe me, I tried). I will update this review as soon as I lay my hands on compatible earphones, but I expect them to behave exactly like all other eartips in this list. SpinFit CP1025 In this round-up, we shall explore how well this mechanism works across a variety of IEMs. Models to be evaluated: Spinfit CP-100, CP-100+, CP-145, CP-145 (medical-grade silicone), CP-240, CP-360, CP-500, and the CP-800. The only two in-production models that I don’t have with me are the CP-155 (I don’t have a large-nozzle IEM at the moment) and the Airpod-specific CP-1025 (I don’t have an Airpod). With that out of the way, let’s head right in. SpinFit eartips have been one of our favorites here since first trying out a pair that was bundled with the DUNU Luna. The main appeal is that they have the comfortability of silicone tips, but provide a better seal than the average silicone tip due to their namesake patented swivel technology. Basically, there is a joint near the top of the eartip (the part inserted into your ear) which enables it to bend and conform more completely to the shape of your inner ear. The SpinFit CP100+ (or CP100 Plus) are the exact same as the CP100 in terms of size, but they are made with a different material. They keep the same diameter of 4 mm and the same variety of sizes (SS, S, M, L, XL), but they are made of medical-grade silicone and feature more subdued colours and a more transparent dome.

SpinFit CP500

I also noticed that the EM6L is quite dependent on the source material and the DAC amp connected to it. When I connect it with my Moondrop Moonriver 2 Ti, the mids and trebles are a bit smoother and more forgiving. Whereas with my Fiio Q3, songs with bad recordings or sibilant sounds come through as such. With the Xenns Top, either connected with Moonriver 2 Ti or Fiio Q3, songs with bad recording or sibilant in nature do not sound as bad as they are. That preamble aside, the CP-500 has a soft flange along with a similarly soft bore. The flange also has a somewhat oily texture to it, resulting in a fit that’s not the most secure and requires a bit of a deeper insertion. It’s a very comfortable eartip but isolation is worse than the CP-100/145/360. This is an eartip I’d recommend if you’re someone who’s into “tip-rolling” (as in, experimenting with various eartips). The CP-500 provides interesting results with many IEMs. W1 offers a similar fit to CP145, but updated materials and design to generate less pressure inside the ear while delivering a secure fit and seal. The CP100 provides an easy fit on an IEM with smaller to medium sized nozzle like 64 Audio’s Universal fit offerings. CP145