f you're looking for the next step in your audiophile journey coming from ISN H40/H50, the EST50 certainly does feature one of the best bass around in the segment but also adds a very engaging and more technical midrange with a refinement that it's pretty impressive at this price point! If you don't know ISN or were looking for a more balanced and refined presentation than the H40 then I strongly suggest you give them an audition!

If you're looking for a warm, engaging, fun and punchy IEM that you can listen for hours without fatigue, with a huge soundstage and good resolution then you'd be hard pressed to find a better IEM for the price (and much more)!