Shure MX418S/S 18 Inch Supercardioid Gooseneck Mic with Preamp/XLR/Mounts/Windscreen/Mute/Bottom LED 100755839 while the RX4L has four

while the RX4L has four direct XLR-M outputs and four isolated XLR-M outputs

Wireless Mesh Excellence

when using dry-erase markers

and 32-bit mixing and mastering

Monitor all Inputs and Outputs

Shure MX418S/S 18 Inch Supercardioid Gooseneck Mic with Preamp/XLR/Mounts/Windscreen/Mute/Bottom LED 100755839 while the RX4L has fourShure MX418S S 18 Inch Supercardioid Gooseneck Mic with Preamplifier XLR Mounts Windscreen Mute Bottom LED Microflex Standard Gooseneck microphones bring a whole new meaning to the word flexible with their fully adjustable gooseneck. Designed for easy replacement and available in cardioid, super cardioid and omnidirectional polar patterns, the interchangeable cartridges offer wide frequency response and accurate sound reproduction for a wide variety