I don't remember who on this forum mentioned these:
https://www.amazon.com/gp/product/B0856ZJPZ6/
They said they ordered them and would write their impressions, maybe I miseed the post but I never saw anything, got curious and ordered them myself. I've had them a few days, and I'm definitely surprised at how good they are for the price. They have good mids, both male and female vocals are clear, timbre sounds right, and the bass is good, not overwhelming, and there's decent sub-bass. Treble is good, a bit less compared to mids (one peak around 9kHz when I listen to a perceptual frequency sweep), very upper treble sounds a little subdued (FYI my hearing rolls off around 17k). There are no vents I could see, they seal well and block out a lot of external noise. Standard MMCX so I was able to use a balanced cable I had lying around no problem. They came with the small tips installed, switching to the medium tips gave me a good fit (most medium tips fit me well). The nozzle is a standard size so you can try other tips easily (I tried four other types of tips but none of them were better than stock, so I've paused experimenting with tips for now). Due to the earphone shape they are very easy to take out and put in, which I find handy.
The Amazon product page claims two balanced armatures, and that'd be interesting if that's the case, the bass sounds better than pure BA bass I've heard in the past (don't get me wrong, these don't compete with the best dynamic driver bass out there, but I can listen to bassy EDM with them and enjoy the music). Design-wise, they are reminiscent of the Yamaha EPH-200 (except those have a much larger nozzle that can't be used with a lot of standard tips). I've never heard the EPH-200 so I can't compare them. The brand is DCMEKA, which I've never heard of before. On the top of ear barrel is printed "E13S". On the Amazon product page the item model number is "2020E13earphone". The box they came in was small, professional, and somewhat generic, with the earphones packed in a decent nylon drawstring pouch and the extra eartips in a small ziplock bag. The back of the box has some basic instructions, mentions a 12 month warranty, any problems contact them at
service@e-chg.com (the Amazon seller is CHGUS). Going to
www.e-chg.com presents you with a Chinese website with two big buttons and some pictures of stoves. The left button goes to
www.dcmeka.com.cn and the about the company there, when translated by Google Translate mentions, "The company mainly produces: integrated stoves, DC fans, household heating equipment, mainly for overseas customers in Japan, South Korea, Europe and the United States, domestic customers TCL, Yunmi, Airmate OEM, ODM." Huh. Well, for a company that mainly makes stoves, they make pretty good inexpensive earphones!