Linsoul 7Hz x Crinacle Zero:2 10mm Wired In-Earbuds for $19.99

I actually looked and I don't have these exact ones. I have the iteration before hand and the model that Crinacle wasn't involved with. Crinacle being one of the most popular headfi youtubers. His reviews on how to EQ several sets I own work for me so I don't mind small gambles on things he approves. 7Hz is a subsidiary of a bigger group of sort of boutique audio shops in China. They have typically pretty advanced 3d printing capabilities and do a ton of these specifically designed sets. Not a lot of kids practicing advanced classical music here in the west but it's huge in China so there is a market for producing high end audio gear at a price point. Whether you want 3 real drivers or 8 BAs with one driver they can figure a way to make it work.

A lot of these that these factories pump out are pretty crappy but the 7Hz Zero original is consistently on the top lists for budget recommendations.

Dollar for dollar these are probably the best earbuds you can buy under $50 but probably $100. Pair them with a small DAC from drop. I personally have a FiiO BTR5 but there are other options cheaper or better. The inline little dongle apple sells for iphones for instance is more than potent enough for these.