I already own several KZ IEMs, but I have them connected to Bluetooth adapters. I wanted a back up set to keep wired just for my home office.
Gold set: Bass forward just as suggested. it is honestly great for the price if you want a slightly bassy IEM. It lacks the tightness of a higher end bass heavy option, but it avoids the weird crossover issues that some ambitious multi driver models suffer from. I was suppressed at how well it compared to my KZ ZAS. To be clear, the ZAS is better/tighter in the bass range, but it also cost $75. I think the bass quality was very comparable to the KZ Z3 earbuds.
Sliver clear: "Balanced" set. My favorite KZ IEMs are the Crinacle ZEX pros and I wanted these to be a cheaper version of that. They almost get there. The tuning is not quite the same, but only in that the tonality is less supported in some registers, but the even feel of the range is similar. When I listen to music, I want true recreation. Let the recording engineers set the bass and treble, I want my IEMs to behave like a monitor. These are very good for this price. Again, not as good as the ZEX pro, but if this was sold on it's own for $13, it would be a budget champ. I like it more than the KZ ZSN PRO as I personally don't preferer the V shaped tuning as much.
Clear green: "Hi-Res" set. These are interesting. I don't think that these are going to be anyone's go to for music, as the high treble is very forward. These might be good it you have some hearing loss and want to bring out the treble range. I have owned many Klipsch earbuds and these remind me of the crisp impactful cymbal crash reproductions that I got from those. I have found that they are surprisingly good at letting me understand dialogue from poorly recorded video. They are so clear in the upper vocal ranger that it brings speech that would be muffled to the front and helps resolve the consonant sounds. Weird as a one off, but I am glad to have them in my collection for the odd occasions that I need them.
Other thoughts: I like what KZ is trying here. With so many multi driver options, getting back to a simple set up and offering a variety of tuning is very cool for anyone who wants to get into IEMs but can't drop a fortune on a pile of them. I like how light these are. I tested all of them both wired and connected to the AZ09 Pro Bluetooth adapter. I noticed immediately how much more comfortable these are while using the AZ09 compared to my ZEX Pros and ZAS which are both heaver multi driver models.
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