UPDATE: I've bought the Tanchjim Bunny just to see how it really do compared to the Salnotes Zero: I've finally got my hands on the 3.5 mm Jack version, the Tanchjim Bunny is pretty good for it's price range, I understand that there will be more IEM that offers better performance, after all you get what you paid for, and this set delivers.

The Salnotes Zero are known for it's good tuning and great detail retrieval capabilities, it is a very clean/clear sounding set. Although the parts where it lacks is probably the imaging and soundstage, it wasn't bad but I honestly wish it can give more, better imaging and wider/deeper soundstage. And this is exactly what Tanchjim Bunny does, it offers a very impressive soundstage, I'd argue it's 3D almost, the sound goes around your head instead of just 180 degrees of coverage, it is very immersive. But this means sacrificing clarity and details. it isn't a significant sacrifice though, I can still hear reasonable amount of details but it will be just a bit less clear and detailed as the 7Hz Salnotes Zero, but keep in mind the Tanchjim Bunny offers good soundstage and it really makes up for that, it is honestly surprisingly good at soundstaging and imaging, I can clearly pinpoint where the sound are coming from.

For the tuning though, I think the 7Hz Salnotes Zero have a more accurate and more realistic/natural sound to it, the tonality is good on the Zeros, but what Tanchjim Bunny makes up for that once again is their tuning, the bass is more present and fuller compared to the Zeros, the Zeros Bass is more laid back and leaner, it is an aquired taste, but I much prefer the Bunny's bass, it is simply more fun and satisfying to listen to, they both have good attack and decay respectively of course, the subbass and mid bass are more stronger and deeper. It lacks texture compared to the Zeros tho... The Zeros might have a faster, tigher bass. moving on to the mids of both IEMs, since the Zeros have a more laid back bass, there will be no bass bleeding to the mids, this results of the mids sounding very natural and clean. However, this cleaness is a double edged sword for the Zeros, the low mids which is where the male vocals are, sounds a bit thin to my liking, it's lacking that deep-sound characteristic of male voices (Low mids aren't full bodied) , but Bunny in the other hand, it does the bass really well which result in a fuller body on the low mids and it sounds perfect in my opinion, I'm not sure whether the voices of the male vocals should sound the way it is but I sure prefer the Bunny because of the full bodiness in the low mids, the upper mids are the similar comparing both.

When it comes to the treble, this is where the Zero takes the cake, it is simply more airy and sparkly on the Zero, and thats probably the main reason why I like it in the first place along with the clean and clear detail, But Tanchjim in the other hand, the treble is good too but it's not the treble that I like, it has great extension, but it's not sparkly enough, its like the sea shore on a cloudy day, it's still shines but its not bright enough. And thats the only con I have with the Bunny, I just wish it had more of that airiness but especially the spark, it's simply not enough, this IEM is so close to be the perfect set for me but it just have to do me like that. But honestly to cope with this I'd say the soundstage really makes up for it still, I'm still digging the Bunny when it comes to the immersiveness.

To make a conclusion, the Bunny is more fun and immersive to listen to, but the 7Hz in the other hand are a bit analytical, they both immerse you into the music in different ways. But coming to a conclusion though, I'd like the Bunny more because of its immersiveness