Let's face it, you're not buying a wireless mic system so you can perform in your bedroom or basement. You need it so you can rock the stage in front of a crowd. Your system needs to be mobile, It needs to be protected, It needs to be racked! And while many of the Audio Technica wireless systems have rack ears or rack mounts supplied you will probably need something that will rack 2 systems side by side. That's where the Audio Technica AT8628 kit comes in. This is a complete joining-plate kit for the 4000 Series, 1400 Series and 1200 Series receivers. Allows mounting of two receivers in a single 19" rack space. Also mounts two AT-MX341a units.