Compact and lightweight. The Radial MIX 2:1 Two Channel Audio Combiner and Mixer is a completely passive compact summing mixer. It is designed to sum two audio channels down to a single mono output. The MIX 2:1 features a book-end design and is crafted from 14-gauge solid steel with I-beam construction. The military-spec circuit board features premium-grade components resulting in an exceptionally reliable small-format unit. The MIX 2:1 is equipped with 1/4 TRS and XLR inputs both of which feature independent level controls that allow you to bypass them. This can be done paired or individually. The second input has a 180-degree flip which allows you to check the polarity of your audio to prevent phase issues. Make your life easier with the Radial MIX 2:1!