The P4M is a highly versatile four-channel, two-bus stereo mic/line mixer designed to optimize use of personal (in-ear) monitors like the Shure PSM 400 in live performance. The P4M features four balanced mic/line inputs, each with level and panning controls. Corresponding XLR split outputs allow input signals to pass through the unit unaffected, while providing an independent mix. There are a number of applications that benefit from the features the P4M has to offer: