Depending on how far you define "undiscovered"
Xavian
http://www.xavian.cz/en/index.html
Brodmann Acoustics
http://www.brodmannacoustics.com/en
A few years ago, Albert mentioned Bösendorfer; Brodmann may be regarded as a successor to them since Bösendorfer speakers went out of production after Yamaha took over that venerable company;
Also, one that belongs to the really almost unknown:
Daluso (Design Aluminium Soundsystems)
http://www.daluso.com/
Xavian
http://www.xavian.cz/en/index.html
Brodmann Acoustics
http://www.brodmannacoustics.com/en
A few years ago, Albert mentioned Bösendorfer; Brodmann may be regarded as a successor to them since Bösendorfer speakers went out of production after Yamaha took over that venerable company;
Also, one that belongs to the really almost unknown:
Daluso (Design Aluminium Soundsystems)
http://www.daluso.com/