Hear Technologies Hear Back OCTO Four Pack Personal Monitor Mixing System(4) OCTO Mixers, (1) Hub, (4) 50 CAT5e cables, (1) DA 88 cable, (1) Tote Back, (5) Blank Overlays The next evolution of the Hear Back 8 channel personal monitoring system has arrived introducing Hear Back OCTO. With improved audio quality, system performance, and overall ease of use, it revolutionizes monitor mixing on stage or in the studio. Imagine getting your mix exactly the way you want it. With the Hear Back OCTO, you save time and get the sound