No one has a bore as wide as Symbio one. Have a try with the CP240 L, they're excellent.
Actually there are plenty of wider bores. Like for example, the stock Andro silicone tips (which I'm not fond of) has wider bore. Spiral Dots has wider bore. I just find Symbio Mandarin W an ideal bore size for iems that works well with iems with 3 sound outlets like TG334 or Andromeda (and I think also with ones with such large nozzle). I don't know why this is, but the imaging sounds most convincing with a precise bore diameter with them. I think it creates an ideal "room" size along the tip canal to the ear to create the most convincing head stage (iem sound stage inside the head).
I find this diameter limit contains the sound to the point of creating an ambient feel. If the bore diameter gets too large, sound seems all over the place, chaotic and not controlled sounding (uncontrolled imaging).
What I also realize is that, thickness of silicones matters (for me at least). When the silicone is thin like Spintips, the silicone folds when inserting, and create gaps as result, not sealing too well. This creates worse response, and not proper sound. With thicker silicone material, it's not easily malliable, will keep in shape much better, and therefore seal better. Another step up is of course like how Symbio Mandarin is. Having a foam support under the silicones so that the silicones does not fold. In which I think is catagorized as hybrid tips since it's a hybrid of silicone and foam. Sony actually started the hybrid tips (It came with Sony EX1000), which was less dense type of foam than Symbio.
In terms of foam, I find high density foam to be the best kind, not the more porous Comply foam, but the much denser stuff. Why these are good is that, they shape to your ear canal, isolate well, and also the denser material doesn't really change the response like the more porous ones. I'm talking about the foam tips that comes with 64 Audio Tia Forte or U18t.
I ran into particular kind of tips that worked well that wasn't the the usual ones that I've seen in the past. They came with Jaybird run, and it was shaped flat at the end looking trapezoidal. These actually seal well, and seemed a proper fit for me. Jaybird calls them Oval Ear tips.
The Meelectronics ones are excellent, but I feel them a bit too loose for my ears.
One word, Awesome!
