Some BA only iems do have vents for the vented BA that is taking care of the bass.
The Audiosense T800 is one example of that.
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how about letting the iem to play a some songs for an hour without putting it in your ear,
for moisture problem on the BA5, replace the nozzle filter with moondrop dual filter, my ba5 is still fine.
maybe will also work with the diamond,
*much love from Indonesia, 
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I just started experiencing this same issue, last night, but with the Kbear Believe. I’ve been using the Believe for around 5+ hours a day since I got them this past Monday. I had no issues with sound/volume changes till last night, and only after using them for about 2 hours straight. (Left channel only.) I tried wiping off the white filter and noticed it was damp. This also made the sound worse. (To be clear, it is mostly the volume that is changing/reducing.) I then blew on the filter and wiped it again, and that seemed to do the trick. Then, when I used the Believe this morning, I only used it for about 20 minutes and the issue returned. I’m afraid, due to the filter, moisture may be building up inside the iem and the filter is preventing it from fully drying out. Does that sound like a possibility to anyone? And to be clear, when I’m not using the iem, I leave them out in the open to air out. I almost never place them into their case.
Sorry to hear… so frustrating!
I bet they sound good! But that filter design is so frustrating…
I think the company should at least know about it (if not replace them too).
Ugh. They do sound so good! I’m quite sure this is a moisture issue, but just in case, I’ve ordered a replacement on Amazon. If it happens again, I’m just going to return them for a refund. I’ve read on other posts where people have removed the white filter to play with changing the sound characteristics, but I don’t want to get into that. I’m crossing my fingers the replacement doesn’t have this issue. They really sound good.
it is 100% a moisture issue. If it is due to their design, then your replacement will have the same problem.
I am guessing your earwax is the cause of it. So maybe cleaning your ears might help. If not, I suggest placing a silica gel packet inside a storage case with the iem.
Honestly l think it will happen with the replacement. Mine didn’t help.
As for moisture and earwax… shouldn’t be a problem at all. Simple fact… my starfield it00 form 1.1 kz cca none have this issue…AT ALL! NO CHANNEL IMBALANCE ON THEM.
So a modern iem should be able to be resistant to moisture! Period. Exactly like the ones l mentioned above are. So kbear should try and do what others are doing.
My opinion.
Good luck of course!
My ears are/were clean. I’ve canceled the replacement order already, thinking the same thing, that this is a design issue. It’s a bummer because they sound so good.
EXACTLY my feeling with the Diamond… Great driver and sound, terrible detriment in the mechanical design ; [
The Starfield, though not really similar in sound but are close in driver set up, keep truckin’ along with no issues and still have this single dynamic sound… so for now these are IT for me…
Thought about getting the Believe but no…because of this problem they’re off the table. l don’t know about many other single DD in $100-$200 range options so looking at the FH3. But l’m not in a rush ;]
Penon and ISN has some single DDs in that range.
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In my experience I can get condensation issues that sound like the same issue.
My personal solution ended up being to make sure the iem was seated deep enough that the body of the Iem made contact with my ear (concha I believe?) specifically to warm the majority of the iem’s body.
No experience with bullet shaped iem’s and this issue however, but it may help in this case.
Oh no, I just got my Believe a week ago and the left side starts to sound smaller and smaller like yours. did you refund them or still using them?
I ended up refunding them.
So sorry to hear about that. And happy l was cautious about buying them
Yeah, it’s sucks. They sounded soooo good
…yeah… the Diamond too… excellent sound… flawed design…
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I can 100% confirm all the above problem with Kbear Diamond / Believe was due to moisture vapour CONDENSATION behind the nozzle’s filter exactly as Rikudou_Goku put it 100% because of MOISTURE. Some ears seems to be wetter by nature and hell break loose here.
I own Kbear Believe and I observe the nature of the imbalance with volume hours by hours. Trust me it has nothing to do with a faulty driver nor diaphramn nor anything else BUT the nozzle filter that holds the condensation BEHIND it and creeping to the front and appears as wet spot. How does it happen? It begins moisture vapour that seeps into the front internal cavity and later condensed behind the filter. Nozzle fliter has 2 layers of filter coarse (100 mesh with round spot) and very fine (470 mesh fabric). Front vent 1 mm serves as pressure relief vent as well as moisture exit but there’s 1 layer of filter (270 mesh) behind the vent. All these factors slows down moisture from fully exitting. Moisture slowly pool up and condensed on the surface of behind the fine filter and somtimes the front side. It begins to build up on a smallest spot and spread to the whole filter and creeps to the front appearing like a wet look. In fact there is a substantial about of water condensation behind the filter.
It takes time for the condensation to build up and narrowing the sound passage and thus blocking the sound from coming out fully (low volume). There no cure but I found the quickest way to circumvent the problem by covering the vent with a dry tissue and suck on it. Suck it a few times and water will be absorbed on the dry surface of the tissue. It happens to me everyday after a long listening session or during wet humid rainy day or after shower when I dry my ears but not the inner canal. Moisture is a factor but very fine fliter mesh is the No. 1 culprit. You cannot remove the filter because it will immediately becoming sibilant.
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Thanks
l think it can also get into the voice-coil/driver… because sometimes it takes 2 hours of letting it dry to play music fine again… bottom line its a design flaw. lt doesn’t happen at all with better designed iems…
It is impossible to wet the voice coil bcos only the diaphragm is visible. The rest of the driver components is seal tight. Any leak will cancel bass response (no bass). It has to with remnant of water that saturated the who nozzle surface. Suck the nozzle with nozzle facing the ground. Water may sometimes comes out. It’s not totally a design flaw but also sone ears are wetter.
yeah, my Kato does this, has a visible driver. the brass nozzles prevent that. but the steel nozzles have this problems. 1st world problems ; ]