The D SERIES-TPSML1A modules feature an XLR microphone or line input. The module provides IEC P24 phantom and accepts input signals from balanced line-level sources or from both dynamic and condenser microphones. The input signal is buffered or amplified using a studio-quality preamplifier optimized for normal operating levels. For microphone sources, the rear-panel GAIN switch is normally set by the installer for MIC LOW gain. If consistently low mic levels are expected, this switch may be set to the MIC HIGH gain position. For line-level sources, the GAIN switch is set to LINE. In either MIC gain position, the PHANTOM voltage is used to set mic phantom ON or OFF. Phantom voltage is not applied when the input is set to LINE.