To be honest, I have no idea about HiFi from South America.
I can speak for Brazil only. There were very strong brands that no longer exist, but their products are still very sought after by Vintage Audio enthusiasts, such as
Gradiente,
Polyvox, and
Quasar.
audiorama.com.br is the most used virtual museum for searching technical information about products from these and other brands.
Currently, I consider
Sunrise Lab's Class AB Integrated Amplifiers to be of great quality and the best value for money for us. They have a site here
sunriselab.com.br. I myself have an older model of this amplifier that I bought used in good condition in this store:
hificlub.com.br/loja.
https://www.sunriselab.com.br/srl_prod_v8ta.html
There is also a national DAC (Lf Audio Dac II) prepared by audio designer Luis Flugge, recognized by many Brazilian audiophiles, who developed a high-end buffer circuit named (HEB-06):
For new products from international brands that are not "well" made here, I have already successfully bought a Rega Planar turntable at
htclick.com.br, there are a lot of good things with cheaper than average prices.
Another site I like to read about HiFi is
hifiplanet.com.br, the writer is quite honest and criticizes various subjectivist glorifications, something similar to ASR.
The problem is that everything is portuguese only, focused on the internal market. But maybe this information will be useful for, I don't know, some expat settling here.