UPDATE: As of November 1st 2020, the new Mytek European Branch, Mytek Europe Sp.zo.o. in Warsaw, Poland has replaced HEM Sp.z.o.o. as the representative and distributor of Mytek products in Europe. All new Mytek products will be manufactured at new factories in the US and Europe.
OEM? If you’re Mytek Digital’s Michal Jurewicz, you look to your mother country to assist with manufacturing. Mytek gear is designed in Brooklyn, NY but made in Poland by a company called HEM Electronics. Owned by one Marcin Hamerla, HEM is located in the small town of Pruszków, about 20 kilometres outside of Warsaw. He employs just over twenty people to handle product assembly and software development, the latter an increasingly large part of his business.

Each Mytek board has its board components wave-soldered into place, elsewhere in Poland, before coming back to HEM HQ to join a power supply inside its metal chassis. The inputs and outputs are then connected to the board before it is handed off to a software station where the firmware is loaded in via USB and signal routing checked. After 24 hours in a burn-in rack, it is tested again before being prepared for shipping.
I know all of this because the day before the 2019 Warsaw AV Show kicked into life last month, I visited HEM, ostensibly to get the (factory) tour but ultimately to build a Brooklyn Bridge:
The surprise was seeing a new firmware in development that will see the Brooklyn Bridge display cover art and artist/track info. It arrives next week.
Further information: Mytek Digital