Home / Vision / Vision Switchers / ATEM 4 M/E Constellation HD – 40 input, 24 output The massive 4 M/E model doubles the features of the 2 M/E model with 40 x 3G-SDI inputs, 24 x 3G-SDI outputs, 4 DVEs, 16 ATEM Advanced Keyers, 4 multiviews and 2 SuperSource for 12 x DVEs in total. Category: Vision Switchers Related products Blackmagic Design ATEM 1 M/E Advanced Panel Blackmagic Design ATEM 2 M/E Advanced Panel ATEM 1 M/E Constellation HD – 10 input, 6 output Roland V-1600HD