ISN Audio EST50

The ISN EST50 has a tuning with a tasteful bass emphasis without letting down the rest of the frequencies. Of course there is much more than classical and the tuning of the ISN EST50 low-end is perfect for listening to rock, metal, electronic and other kinds of similar music.
Present mid-range, well defined treble and great technicalities so it is well suited for listening to all kinds of music as long as there are no critical requirements. It is musical, exciting, engaging and responds well to upstream gear. Well made and very comfortable, it is highly recommended.

https://www.head-fi.org/showcase/isn-est50.25254/review/31652/

The ISN EST50 is a rare earphone because it combines plenty of bass and sub-bass with a smooth sound signature and without lacking in mid-range intensity and clarity. Very recommended for all kinds of music as long as you are in a casual and not critical listening mood.

Sub-bass extension is really great, the bass is well emphasized but it doesn't suppress the mids and the treble. It is dynamic and impactful, visceral and full bodied but a touch slow and not that controlled. The mid range is really great, breathing and articulated with excellent tuning that makes instruments and voices to sound extremely realistic. Musical and engaging it is going to captivate the listener. The treble is smooth and forgiving but not devoid of energy and luminosity. The most interesting part is that it is very resolving and refined without sounding fatiguing or bright.

This is an impressive IEM with a rich, bold sound. It does all 3 bands great; bass, mids and highs are all excellent, plus there is 3d imaging and soundstage. I burned mine in 300+ hours before the bass finally settled. I feel the EST50 punches way above it'e price point. Easy to drive but also loves power. Treble is rich with micro dynamincs, also great body and extension but non fatiguing. The mids are rich and layered and the bass thumps deep and hard with great layering and rumble. There is also great coherency. Highly recommended.

I want to die with these in my ears....... ..
A dream beyond this world.....
That's what EST50s are to me...
A TOTL monitor with astonishing sound..
The sweetest thing I have heard in my life... .

Upon arriving on Bass Island you will find exotic charms only found at this single location. Such a brew is heavy and intoxicating. Your ideas of sound reproduction may be challenged, even coerced, yet you will like it! Maybe? While the ISN EST50 may not be the best single IEM you own, it could be? It’s a personal judgment call if this style of fun is the fun you want to play everyday 24/7. Still there would be no stoping you if this was your choice. The Rock-n-Roll chops that it regularly provides take you to a special place.............far from home. It’s questionable if there is even a way home after this visit? The EST50's build and look is absolutely beautiful. Such swirls and sparklers offer never-ending amusement. The fit is fantastic, the S8 cable is in-fact 100%, the real deal.

Full review :
https://www.head-fi.org/showcase/isn-est50.25254/reviews#review-28717