As a guy who swears by KZ's old budget offerings, I've held off buying any of KZ's new generation of IEMs..... until now that is.
Behold, the KZ EDX, my first modern KZ IEM. At $7 US, it sits at a very cheap price-point, but does it sound more than what its cheap price suggests?
FIRST IMPRESSIONS
On first listen I was pretty amazed. The first song I played was Awake by Tycho and I loved how it rendered the treble so crisp and airy. Mids seemed natural and the bass, while lacking, had great punch when connected to an amplifier with the bass gain on.
However once I started playing anything other than Tycho it became clear that the EDX wasn't actually that great. In reality, the mids are actually very recessed, especially with EDM tracks. The treble also gets pretty sibilant as well. So basically you're looking at an extreme V shape. Overall, the sound presentation for most tracks, especially EDM, appears to be very thin and hollowed out and lack any sense of body or foundation. The EDX actually kinda reminds of the TRN M10 which has a very similar sound signature, and that includes the hollowed out mids part. I'd say the TRN M10 is a tad better.
For the price I can't fault it, but honestly you'd be better off paying a bit more for something like the old but gold KZ ED9, which destroys the EDX in every aspect (especially WRT the mids). The Sony MH755 also comes to mind as a far better option and even cheaper (tho the MH755 is rare now). Even some cheap Panasonic Ergofits would destroy this. Also I don't know if they sell it anymore, but the KZ ATR was around the same price and it definitely trounces the EDX.
VERDICT
Unless your music collection consists entirely of well-mastered acoustical audio (such as any song from Tycho), then I would not recommend the EDX. In fact I'd stay far away from it if you like your mids.