I will start by saying that it was a big surprise , due to the fact I thought they weren’t that good at first. They sounded some what bright and lacking punch I got them on sale for 90 so i thought it wasn’t too bad of a loss. So as I let them do some burning in time I tried multiple tips you guys remember the blon 03 yeah same issue here it has a short nozzle but they’re tiny so once you get the right ear tips they stay in nicely and you can sleep on your side with these on which one of the reasons I like them. Anyways with the right tips the sound was just great I used it with a Hidizs s9 , s3pro, btr5 and the sudio mk2 i think is called. Ok so They sound incredible in my opinion the detail retrieval is great it feels like there is a BA driver in there too the vocals are pushed forward which is why with the crappy ear tips it came with sounded harsh the bass is just right los not overly done but it has an echo if you know what I mean these iems sound wide specially using them with the Hidizs s9 which is my favourite combo by the way I found with the btr5 on high gain the bass it’s more prominent so it does like power I still have to try it on my actual dac and amp stack but with the portables I’m blown away with the Hidizs s3 which I just have it as it came I didn’t update the sound signature sounds very rich in bass with with rumble on the mid bass but you never lose the detail I think my s3 came on bass boost which sounds freaking great with these. Anyways 7 htz did it again with the i88mini best detailed dynamic driver I own I do have the timeless which we all know about I kind of would like to say that they tried to put that tuning on this no as fast and as I say it likes power so you can get more bass in my opinion and last but not least I can sleep with them on oh and the black and red number 7 looks so cool I’m very happy with this item !!!!