Joined in 2023 
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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. In terms of sound, there’s not much of a difference with the CP145, though highs tend to be a bit more present (probably due to the material being harder and therefore more prone to reflecting higher frequencies). The CP100 provides an easy fit on an IEM with smaller to medium sized nozzle like 64 Audio’s Universal fit offerings. CP145 Fits Jabra 75t, Google Pixel, and more without adapters. Has special adapters for AirPods Pro and Galaxy Buds.
Fitting earphone nozzles: the first problem for the novice is – and it certainly was for me – to find the right SpinFit model to fit a particular earphone. First, one has to select the right diameter of the inner stem so that the SpinFit is being held safely in place. As a rule of thumb, most earphones have a nozzle diameter of 4.5 mm so that the CP145 is the most universal model for initial tip rolling. The main differences with the CP360 are the height and the radius: the CP1025 are shorter and slightly narrower (12 x 6.7 mm vs 13 x 8.5 mm), so they don’t go all the way inside the ear canal but manage to seal it effectively thanks to their wide radius. This also means that they fit most charging cases better, as they are shorter. It’s the groove in the inner bore that makes the difference: it grips the lip of the nozzle much better than the usual smooth eartips and this provides better comfort, as the tip is more stable, while also providing a more uniform sound quality across earphones: the distance between the sound port and the end of the eartips is constant, so you get the optimal distance that SpinFit found. Speaking of sound, I find the CP500 to be neutral as they don’t modify the sound significantly – for better or for worse. Eartips are a very personal thing. There is no good or bad in most cases, there is good fit and lesser fit, which depends on both the devices they are mounted on and the listeners’ ear canals. These variables create a large number of possibilities and uncertainties so that no eartip is fitting universally. These variables are:
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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 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. The SpinFit CP100 are the basic model, which by shape and feel most closely resemble “standard” eartips. They are conical (a wide ogive, to be exact) and offer a diameter of 4 mm which fits most earphones (including the Campfire Audio Vega 2020 and Dorado 2020, the Thieaudio Legacy 4, the Tin HiFi T2), but which is also a bit tight for earphones with larger nozzles. Still, they’re the ones that will probably fit the larger number of earphones, as they do just fine even with those that have a smaller nozzle like the Legacy 4. They come in 5 different sizes: SS (XS would have probably been better), S, M, L and XL. CP360 and CP1025 are designed for TWS earphones. CP360 is designed to provide a deeper fit, while CP1025 is more shallow. While both will fit on most TWS earphones, some charging cases may not be compatible with the CP360. CP1025 is also available with adapters for Apple AirPods Pro and Samsung Galaxy Buds Pro. W1 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.
They’re quite comfortable and in fact I find them to be slightly more comfortable than the CP100, because they fit more snugly in my ears. They’re the closest equivalent I have found among silicone tips to the sensation foam eartips give me: that my ear canal is sealed by something that fits snugly in it while respecting its shape and boundaries. In other words, it doesn’t feel like something that gets inside my ears while trying to impose its presence, asking my ear canal to adapt to it, but it feels like something that fits in the canal trying to take the space in there and nothing more. It’s a weird sensation that’s very difficult to describe, but I hope I somehow gave you an idea. Exceptional clarity with good treble extension. Soundstage is one of the biggest I have heard. Vocal presentation is forward. Can get sibilant when matched with bright earphones. The SpinFit CP360 are the first tips SpinFit developed specifically for “true wireless” earphones: they’re much shorter than the others because they need to fit in the cases, which often offer very little space for eartips. This means they can’t count on the depth of the insertion to give you isolation and have instead to rely on width: the ear canal is larger at the entrance and so these eartips need to be wider to seal it. In fact these are among the few SpinFit models to offer an XL size (on top of L, M, S and SS) and that’s because of this. The L size is 13 mm in width and 8.5 mm in height, while the XL is even larger at 14 mm wide and 8.5 mm high. They are basically shorter CP100! That’s also true when you look at their shape, which is similar but more compact. The inner diameter is 3.6 mm. The CP145 seem to tame bass a tiny bit to give a small boost to the upper midrange and to treble; mind you, we’re talking about a difference that’s not major and is in fact relatively minute. In other words, you won’t be able to make a warm IEM a neutral one, but you will notice a smaller difference compared to other tips. Overall my sensation is that the CP145 deliver a wider soundstage, probably thanks to the larger presence in the upper area, and more accurate imaging compared to the CP100. They still deliver a generally neutral signature. As a last bit, the silicone is actually medical grade, so the added benefit is you shouldn’t have issues with allergies and other adverse reactions. SpinFit CP500The 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.
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