The TSD-MIX41 4x1 mic/line mixer is ideal for applications where multiple mic or line sources need to be sub mixed or summed. In house of worship applications the TSD-MIX41 is especially useful for combining similar sources such as choir microphones to a single mixer channel. The unit also works well as a stand-alone mic/line mixer that can be easily interfaced with AtlasIED amplifiers. Other applications include restaurants, conference rooms, and schools. Each input is mic/line switchable with phantom power provided for condenser microphones. The high quality, low noise internal mic preamps ensure clarity and quiet operation without unwanted coloration. A 12dB/octave high pass filter @ 125Hz also is available on each input to minimize bass rumble and low frequency feedback. Unit requiresPower Supplythat is sold separately for proper function, multiple TSDs can be powered with one power supply based on current requirements. This unit has a power requirement of 60mA so any of the available TSD power supplies can be used with the unit. For multiple TSD applications use theTSD Power Calculator to determine the proper power supply needed. Features Four (4) Balanced Mic/Line Inputs Four (4) Professional Grade Microphone Preamps with Switchable 24V Phantom Power Up to 50dB Mic Gain Per Input 12dB/Octave Low Cut Filter @ 125Hz Balanced Line Output Input Peak & Signal Indicator LED's High Gain Output for Driving Long Balanced Lines Separate Ground Connections Removable Phoenix Style I/O Connectors Security Covers Included for All Front Panel Controls Power Supply Sold Separately Energy Efficient