@both: The SpinFits have a unique design in that they "flex" to fit deeper in the canal. What makes the Spiral Dots different from your average IEM-supplied silicon tip?
Spiral dot tips are just a tad bit smaller than spinfit tips size. The difference is not like another size difference, but it's there. The numbers above are just measurements provided by the manufacturers of the flange diameter so it's not wrong. The tips are just different. I could fit the medium sized spiral dot tip, but they were hurting and the medium small fits me pretty well. For the spinfit tips, I had a hard time fitting the medium and small is just slightly slightly large. If you can fit the medium spinfit tips, you can definitely fit the medium spiral dot tips without problem. They are different tips after all with different thickness and different bore size, so even if the diameter is exactly the same, it's impossible to get the same fit...
So now that I've finally got myself some Spiral Dots I have no idea what all the fuss is all about. 30$ for relatively standard silicon tips...
hmm.
And what's with the dots... ? They cant possibly contribute acoustically as they are hidden by the IEM's bore
(at least in the case of the Angies). At best, they make for a better grip
(or perhaps just the opposite, make it easier to remove)... .
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While
seal and comfort are key factors, the
sonic characteristics of a given tip combined with a specific IEM will also play an important role. Here's my simple comparison. Treble is highly affected by how deep / shallow the bore of the IEM sits underneath the tip. I think material / material's thickness also plays a role.