TK Audio’s BC2-ME is a perfect tool for mastering. It is based on the same basic sound path as the BC1, added with some nice features like illuminated switches and switchable output-stage between electronically-balanced or transformer balanced class-A. The class-A mode offers a more vintage tone, like fat, punchy low-end response with more low mid character. BC2-ME also has a switch that adds extra “even” harmonics to the compressed signal.