Hi and welcome to JustAnswer,Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, bear with us; re-confirm and post back with the complete model number of the "...microphone...phantom power..."
To my understanding, a GLS ES-58 is a cardioid mic and does not need a phantom power supply to work. A Phantom Power Supply would be needed with condenser type microphones.
What is needed then is a mic pre-amp to boost the ES-58's low level to line level.