The MS424 from LA Audio is a high-quality, four-channel 1 x 4 active mic splitter. It has a unity gain signal path that allows you to send audio signals over long distances without degradation. Each of the four input channels has an XLR input connector that has been transformer-balanced. Pad switches on each input allow them to accept mic or line level signals, and phantom power is available for condenser microphones.
Each channel has four transformer-buffered floating XLR outputs. Link switches allow you to link output one of each channel to its corresponding input. You can also use internal links to feed up to 16 outputs from a single input, which is great for press box applications. An internal power supply means you don't have to deal with unsightly and cumbersome power bricks.