Hi, everyone. For 11/11 I took a gamble on a couple low-priced IEMs which looked interesting, the QKZ VK1 and VK4. I'll share with you my brief thoughts about them. Slater has reviewed the VK1 already. There are some videos on YouTube about the VK4, including one from Zpolt.
As a preliminary word of warning, I bought mine from a store on AE called Xtuti. There is no indication that they are made by QKZ. The difference appears to be that they don't give you the branded outer box that QKZ gives you, and you pay about $2-5 extra to get the same IEMs. I suggest that you don't do what I did.
QKZ VK4
https://www.aliexpress.com/item/33008022218.html
QKZ VK1
https://www.aliexpress.com/item/32864592760.html
Xtuti page
https://www.aliexpress.com/item/4000023090134.html
In my opinion, the VK4 (purple/blue) is far more interesting than the VK1 (clear). I don't know why anyone would want the VK1. The VK4 is quite good for its price, but it has some flaws.
Both come with very flimsy cables. Both offer poor isolation. I had no problems with fit with either, but the VK1 has completely smooth tubes to support the ear tips, so you might want an o-ring or a similar solution to keep your tips in place. Ear tips will easily slide off and stay in your ear during removal. Both have all-plastic shells so they are quite light and feel very cheap.
VK1 needs power. On my phone, I was at about 65% volume to get enough volume. Bass sounds a bit exaggerated but distorted and ill-defined. Mids are congested. The upper registers sound pretty nice by comparison but artificial. It's a mildly V-shaped presentation. Changing cables and amping with the E1DA 9038S, the situation improves markedly. The bass is still flabby but mids tighten up and come forward. High frequencies are crisper. Nevertheless, there is smearing and distortion up and down the range, and everything sounds a bit distant, as if I haven't gotten a proper fit. I get the feeling that the driver has some potential but resonances with the shell are ruining the final result. I don't think they will please many.
VK4 is easier to drive. Bass is too little for me but it's better controlled. There is a nice clarity in the higher frequencies, but the overall sound is bright and again, there is a sense of distance that I don't like. Mids are there but they aren't very textured or full. I'm keeping the volume down at around 50% because the brightness does not invite higher volumes. Technicalities are better than in the VK1 but nothing to get excited about. Switching to the 9038S, the VK4 shows itself to be surprisingly well-resolving in the mids and highs, although there is dullness in more complex music. The bright sound signature continues but bass is better represented. High frequencies can be glaring. The tonality is a bit artificial. Comparing to the BLON BL-03 when amped, resolution is slightly better on the VK4 in the mids and highs. The BLONs are smoother, bassier, and more natural-sounding. If you find the BLONs to be too bassy, you might prefer the VK4, but keep your expectations in check. Their brightness prevents me from being truly enthusiastic. However, for $12, they are an interesting and respectable IEM when amped.
I used Spiral Dots (L) for these impressions, which are not the result of a lot of hours of listening. Usually I am enjoying my TRN BA5.
Thanks for reading!