If you're looking for an immersive IEM with holographic soundstage, deep powerful bass with excellent punch and control, a forward and articulate yet velvety midrange with rich textures and last but not least engaging treble with excellent extension then look no further, Zen will offer countless hours of musical bliss!
If you're looking for a superbly built IEM with a reference baseline beautifully spiced with a subtle touch of organic that you can adjust with the flick of a switch, then the SA6 holds fantastic value for the price and will be tough to beat! It packs impressive resolution and a remarkable tonal accuracy across the range. A very engaging reference IEM, that follows in the footstep of hallmark IEMs such as the InEar Prophile 8 at a fraction of the price.
If you're looking for a smooth and engaging hybrid that feature powerful bass, a full bodied midrange and well extended exciting yet smooth treble then Earsonics Blade is a strong option in a crowded market. If you're a Earsonics fan then this one should be a no brainer if you want the house sound with extra power in the bass and a clear step up in build quality. If you're looking for a snappier, punchier hybrid from Earsonics then check my Stark review.
If you’re looking for a fun IEM with sound technical foundations that you can listen to for hours at times without any fatigue, then the FIBAE4 is definitely a must own in a collection especially in its price bracket! If you’re looking for fun tuning with more bite and a snappier attack then there are a few mid range IEM that could suit you more like say Earsonics Velvet v2 or - more pricey - the Earsonics Purple or Campfire’s Atlas.