A great review of the SMB-01L in the February 2022 709 issue of the French-speaking monthly magazine for classical music and hi-fi, Diapason. 

Although the music lover is not confronted with the same concern, he will appreciate a linear and extended response, a good neutrality and a sufficient transparency, the whole without excessive fatigue. The SMB-01 L was objectively designed with this in mind and, as such, it is not a demonstrative headphone. Neutral is the best word for it, while not cheating on tonal color and dynamics. The bass level is consistent without being excessive and the midrange is very well articulated, just that the SMB-01L appears more reserved in immediate comparison with more chiseled headphones.

nough to put the SMB-01L in the category of Sustainable music investment.