ART MX821S is a 1U, 19-inch rackmount mixer that combines eight input channels and mixes into a stereo line-level output. Each independent input channel accepts a balanced, 3-pin XLR microphone input or unbalanced 6.35mm TS jack with line-level signal, and provides independent level and pan controls. The ART mixer has been designed for use on stage, in the studio, or for permanent install applications including conference rooms, corporate boardrooms, churches, restaurants, small clubs, health clubs and more.

MX821S offers +48V phantom power, which may be applied on each independent microphone input. A master level control adjusts the signal output to the low-impedance balanced 6.35mm TRS jacks. A pre-fade output and an aux bus input by way of RCAs (phonos) allow patching of multiple units when more channels are required.

Removed from a working studio. Sold as seen, no refunds. 

Input connections: 3-pin female XLR, balanced, mic, channels 1-8; 6.35mm jack TS, unbalanced, line, channels 1-8; RCA (phono), unbalanced, aux bus in, left and right. Output connections: 6.35mm jack TRS balanced, main outputs, left and right; RCA (phono) unbalanced, pre-fade out, left and right. Input impedance: 2k ohm, mic; 20k ohm, line; 51k ohm, aux bus in. Output impedance: 200 ohm, main outputs, balanced; 100 ohm, pre-fade out. Frequency response: 20 Hz – 20 kHz, +0, -1 dB, CH 1-8 in. THD: Less than 0.01% at 1 kHz, typical. Phase response: All connections are phase coherent. Signal to noise ratio: Greater than 99dB typical, ref 0dBu. CMRR: Greater than 43 dB typical. Maximum input level: -4dBu, mic, +22dBu, line. Maximum output level: +24dBu, balanced; +18dBu unbalanced. Maximum gain: 54 dB, mic, 29 dB, line. Phantom power: Switch selectable, +48V DC, regulated and filtered; 7 mA current limiting per leg. Dimensions (HxWxD): 4.5 x 48.3 x 15.2cm. Weight: 2.9 kg.