It appears that KZ has successfully reengineered the overly sibilant ZS6 into a set of full spectrum phones. The stock, non-mic cables I received produce a veiled, bass boomy sound signature that hides how excellent these earphones can sound. Ditch them quickly and opt for more balanced cables. Just make sure the 2-pin cables are compatible with the phones. Some of the earlier KZ compatible cables have pins that protrude too much, as the plastic holder the pins are in stick out too far for the ZS7s. They can be used, but they won’t be flush with the earphones’ sockets.
Earphones are only the end component of your audio system. If you have low resolution sound files or poorly recorded sound files being played by a low quality source, don’t expect any sonic miracles from the ZS7s. If you are listening to lossless format music on a quality DAP, these could very easily become your daily travel IEMs. I like the tips that KZ ships, as they seal well for me. If you don’t have a good seal, you are missing much of your music, bass especially.
These phones fit my ears very well. It may be different for you, as comfort in IEMs is extremely subjective. I must wear a medium tip in my right ear and a large in my left to seal appropriately and this causes problems for me in some of my phones. Experiment with various tips to find ones that seal AND feel comfortable. You’ll enjoy your musical experiences more, if you do.
These are excellent phones for the money and they deserve better cables. Much better cables.