Shure P3TRA215CL Wireless In-Ear Monitor System - J13 Frequency Red Witch For quieter applications you can

For quieter applications you can also power it with a conventional 9v power supply for 1 watt of power

which can deliver up to +12 dB more gain with a little extra emphasis (push) in the toe position

and the ISP Theta Pro DSP guitar pre-amp

and plenty of punch in terms of volume

Shure P3TRA215CL Wireless In-Ear Monitor System - J13 Frequency Red Witch For quieter applications you canPSM300 Stereo Personal Monitor Systems deliver reliable wireless freedom to every corner of the stage. Patented Audio Reference Companding ensures the clearest sound, with ultra low noise and no artifacts. Easy to setup and operate, PSM 300 systems offer one touch frequency scan and sync to find and assign a clean wireless channel. Adjust the volume and use MixMode technology or stereo mode to create a personal mix from two channels of audio.