maybe follow this over at AA
https://www.audioasylum.com/cgi/vt.mpl?f=mug&m=235940
also found this :
https://www.audioasylum.com/cgi/vt.mpl?f=mug&m=235846
"According to Wendell, the LRS is all quasi ribbon, whereas the MMG had a wire woofer and foil tweeter. It’s listed in the specs on the page, but that’s easy to overlook. "
https://www.audioasylum.com/cgi/vt.mpl?f=mug&m=235940
also found this :
https://www.audioasylum.com/cgi/vt.mpl?f=mug&m=235846
"According to Wendell, the LRS is all quasi ribbon, whereas the MMG had a wire woofer and foil tweeter. It’s listed in the specs on the page, but that’s easy to overlook. "