MX821 Audio Series Mixer. The ART MX821 is a versatile rackmount mixer combining eight independent input channels into a single mono line level mixed output. It's essential features include XLR mic and 1/4" line inputs, individual level and tone controls, switch-selectable +48 Volt phantom power on each channel. The main output on the 8-channel mixer is balanced low impedance. An additional pre-fade output and auxiliary bus input jacks allow patching multiple ART MX821 mixers together when more channels are needed. The ART MX821 mixer's built-in power supply and single high 19" rackmount format allows for easy installation and reliable long term operation. Audio Utilities Series Audio Utilities by Applied Research and Technology are audio devices that have been designed and engineered to exceed high standards for audio performance and functionality. These innovative, high-quality components make the ART MX821 line mixer perfect for virtually any application where precision frequency tailoring, reliable performance, and rugged design are of the utmost importance. ART Audio Utilities deliver extremely precise and powerful flexibility, with quality features and reliable design criteria necessary for top-level audio performance.