This. If I want that detail, that is what the zen or timeless are for. If the zen tuning was closer to the oxygen, it wouldnāt be close. But itās not.
Really quite good. Going to compare it more extensively over the next week. But it stands on its own quite well.
The oxygen are really small and light. This creates a situation where they donāt feel very firmly in place. And stiffer tips really can push them out. Even the grippy tips like cp100 plus and crystal donāt really help grip the same way. While they are extremely comfortable, I have found getting a firm insertion that doesnāt feel loose is hard. The seal is fine but it feels like they are constantly in danger of falling out.
The longest and grippiest eartips I have are reversed KZ starlines. Do you have those by any chance?
I personally donāt have any issues at all with CP100āsā¦ 
The IEMs are really light as Dynamic mentioned and to me they donāt feel like theyāre falling out.
Might also have to do with the cable Iām using? It holds them quite well in place.
YMMV of courseā¦ 
EDIT: I just realized itās CP145ās (M) Iām using! 
I use the AZLA SednaEarfitLight for tips. I do not have issues with them falling out of my ear.
Nope. Donāt know what those are.
They donāt actually fall out. Or they havenāt yet anyway.
But they donāt have that āinserted properlyā feeling ever either. Itās like they are hovering in my ears.
Itās really comfortable but also awkward because no other IEM fits like this for me. Itās like they are not there.
Maybe they are the only IEM that really fits me well? ;p
KZ Starline are tips that come with some KZ iems. There is a mod to reverse them. They become super soft and grippy a little bit like CP100 but wider bore and are very comfortable
The flip tip.
You can do that with a lot of narrow bore tips to create a wide bore tip.
I have flipped tips before. Canāt remember which but it was early days with the dunu zen. (might have been a stock tip for them)
The oxygen are just weird because they work with cp100+ SS (just got them) all the way up to XL and still have that floaty feeling.
Anyway, itās just odd. Just about every tip works. Maybe I am not used to IEMs actually fitting in my ears.
I get that with the BL-05s that has super short nozzle so I have to use larger tips and they donāt feel that they are in my ear at all and float. In the end if the seal is good they sound good and they are super comfy.
Now waiting to receive my O2 so weāll see how they compare for wise
Received the O2 today. I donāt have any pictures because I wouldnāt take them out of my ears. Since they are supposed to be the king for acoustic music I listened to my favorite classical/baroque and they are amazing.
Then o switched to some Techno and toy surprise they are great at that too. They more analytical than fun but still a good listen.
For my library they are super versatile.
Nice! Did you get yours during 11.11 sales too? Iām still waiting for mine to clear customs 
Also, people mentioned that the Oxygen 2-pin connectors have reversed polarityā¦which means any third party cable will need to be inverted before being connected. Does it impact the sound at all if you donāt reverse the polarity?
I did with Express shipping. I hope you like it as well.
I didnāt know about this. Iāll have to check tonight. I hope that not the case because I ordered a cable on Linsoul.
Iāll have to verify this today with a multimeter.
Iām using a third party cable and nothing seems āoffā as mentioned in PM.
EDIT: Verifiedā¦ 
Seems to be standard to me. Tip is left +, ring is right + and sleeve is ground. On the IEM end this translates to the + being the one with the dot (blue or red) being the one at the bottom when worn (i.e. ground is the one on top).
Iāve tested a few other cables including the one Iām using (from the Teas) and NiceHCK one and theyāre the same on the IEM end (both are TRRS though).
Many thanks for checking! Maybe Tanchjim fixed thisā¦ From what Iāve seen on head fi, at one point they did acknowledge that the polarities were reversed. Glad to hear that the polarities are normal as I purchased an upgrade cable just for the Oxygen 
I need to bite on this. If these are analytical, what are your fun IEMs? Or headphones.
To be clear, this was when listening to Techno like Extrawelt. I like bass but it needs to be clean. Right now my fun IEM are Tape Pro modded with tuning foam and the Sora Light modded with the vent under the tips + Final ear hook.
Before this I had the Final E2000 (too warm but good SS) and the BL-05s (slow bass + bass bleed makes it boomy and muddy).
Iāve progressed pretty slowly but I have recently purchased more IEMs with different sound signature to figure what I like.
I have been doing A/B testing of my IEMs lately listening to various music genre I have on my music library. Itās been very helpful to me. For example, I liked the bass on the BL-05s before, but listening back to back with the Sora, I realized that the bass quantity was there but the quality was lacking. I found it slow, boomy and with bass bleed. Overall the sound was too warm on the Blon and also less detailed than Sora.
Iāve asked on Discord and i got the same answer. Shouldnāt be a problem. Donāt trust everything you read on Head-Fi
