These are more expensive than most on the market. Still, you end up saving money because T9 is nowhere near as fragile as the other kinds, and the detachable cord means that you don't have to replace the earbuds every time the cord is damaged; you simply detach the cord and send it in for replacement.

UiiSii T9 and this uses 1 Passive driver, 1 Dynamic driver, and 2 BA drivers, with this model, you get dual dynamic drivers who are better for strong bass, and double faster response and more detailed sound in the same time because of BA drivers.

Overall, the sound on these is very high quality and very fun to listen to. They are comfortable and have stood up well to regular use.

The packing looks very nice, and the build quality is superb, the case and accessories included are welcomed, the sound quality is above average.

If you choose well, have good source content, and listen attentively, you will hear clarity and precision that cheaper headphones don't have. Individual instruments will stand out, the words will be clearer, and you'll listen to many subtle details that you might not have noticed, even in your favorite songs. You can also expect more attractive designs, better comfort for longer listening, and better build quality.

For my experience of owning this pair of earphones for about 3 weeks, all three frequency levels are well handled, relatively balanced but not very well balanced, you can hear the bass, but sometimes not very emphasized especially sometimes it's important to hear the bass. To be brief, you can hear the bass, but it's not as loud.

Treble and alto are relatively more outstanding than the bass. Personally, I would recommend this for vocal focused music and instrumental music.

These are really nice IEMs for the money. Good balance, they work well for most types of music. Mostly use for modern music from rock, pop, electronic to hip hop with occasional jazz like Coltrane or classical. Pairing these with an amp and decent DAC really helps. I am using them with the Dragonfly Black and Tidal (good “Master” quality songs). I highly recommend getting some Comply memory foam tips for these IEMs. Adding the memory foam tips increase isolation and drastically help bass. Plus adding the tips make it so you can wear these IEMs for longer periods of time comfortably. The cable around the ear piece gets snagged on its own wires when unraveling for use due to the rigid nature of the part that goes over the ear but not it’s not that big of a deal and happens a lot with IEMs that wrap over the ears. The cables and IEMs themselves all feel like they are high quality.

Excellent headphones for their money. To wear from the first time is unusual, as well as to use longer than an hour, but in a week like used. Very pleased that they do not fall out of the ears despite anything. They have a very wide sound scene, an excellent bass that does not cover the rest of the sound, the detail is a little lacking (in comparison with full-size HD 599), but for their form factor, they are gorgeous.