Compact and lightweight'. '.strtoupper('t')he radial mix 21 two channel audio combiner and mixer is a completely passive compact summing mixer'. '.strtoupper('i')t is designed to sum two audio channels down to a single mono output'. '.strtoupper('t')he mix 21 features a book end design and is crafted from 14 gauge solid steel with i beam construction'. '.strtoupper('t')he military spec circuit board features premium grade components resulting in an exceptionally reliable small format unit'. '.strtoupper('t')he mix 21 is equipped with 1 4 trs and xlr inputs both of which feature independent level controls that allow you to bypass them'. '.strtoupper('t')his can be done paired or individually'. '.strtoupper('t')he second input has a 180 degree flip which allows you to check the polarity of your audio to prevent phase issues'. '.strtoupper('m')ake your life easier with the radial mix 21!