blueangel2323
Headphoneus Supremus
How about JVC spiral dot tips?
Had a FX650 laying around and tried the (M) tips on the SD2. Magic!!!
By the way, what are those IEMs on the right?
I don't think the difference in SQ between tips is so much due to the tip itself as it is how well a particular tip fits one's ear. Tonally, there is a huge difference with even the slightest leakage due to a lack of a "perfect" seal. Of course depth of insertion does make some difference, but as I only am able to use a shallow seal without actually inserting the tip into my ear canal, this is not an issue for me.
Bottom line...seal is everything.
Seal is paramount, but I wouldn't say it's everything. You can't get good sound without a good seal... but even if you have a good seal the sound can be "off" with certain tips. For example, tips with wider bores will act like a horn and increase unevenness treble.