Microphone 48 V Phantom Adapter-2 Channel

The RDL ST-MPA48 is a two-channel microphone phantom adapter designed to provide fixed P48 48 Vdc phantom voltage from a lower-voltage external power source. It operates from an external 12 V battery or 24 V power supply and supports an input range of 10.5 Vdc to 26 Vdc for 48 Vdc output. Its phantom implementation follows IEC 61938:2013, while its specified frequency response extends from 20 Hz to 100 kHz.

Ideal Use Cases

This model is intended for systems that need to supply P48 phantom voltage to two microphones. It is particularly relevant when the available external source is a 12 V battery or 24 V power supply rather than a direct 48 Vdc source. The two-channel configuration allows one adapter to serve two microphone channels, making the ST-MPA48 suitable when consistent phantom requirements must be addressed together within the same system.

Why Choose This Model

The ST-MPA48 combines a fixed 48 Vdc phantom output with a clearly defined operating range and published performance conditions. Its P48 output conforms to IEC 61938:2013, providing a standards-based specification for system planning. The adapter accepts input voltages from 10.5 Vdc through 26 Vdc while producing its specified 48 Vdc output. This range supports the stated use of either an external 12 V battery or a 24 V power supply without changing the phantom-voltage specification.

Installation and Integration

Power for the ST-MPA48 must be ground-referenced. At 12 Vdc, the published power requirement is 150 mA with a 20 mA load. At 24 Vdc, the requirement is 80 mA with the same stated load. The recommended power supplies are the PS-24AS for the USA and the PS-24AX for international use; the power supply is not included. Installers should match the external source to the specified 10.5 Vdc to 26 Vdc input range and account for the applicable current requirement. The listed ambient operating environment is 0 degrees C to 55 degrees C. Available supporting documentation includes a PDF datasheet, an engineering functional block CAD file, and front and end panel diagrams in American DXF format.

Performance Highlights

The published frequency response is 20 Hz to 100 kHz with a tolerance of plus or minus 0.025 dB. This rating is specified with a 150 ohm source and a 1 kilohm load, providing the conditions needed to interpret the measurement accurately. RDL describes the unit as providing phantom conversion with full frequency response. The combination of a fixed P48 output, two channels, and documented response gives system designers concrete electrical and performance values to use during equipment selection.

What Makes It Different

Rather than requiring its external supply to provide 48 Vdc directly, the ST-MPA48 converts a 10.5 Vdc to 26 Vdc input into fixed P48 48 Vdc phantom voltage. It also handles two microphones in one adapter. Its power requirements are documented separately for 12 Vdc and 24 Vdc operation, allowing the supply approach to be evaluated against the intended installation. The unit has a listed WEEE weight of 0.145 lbs and a shipping weight of 0.2 lbs. A high-resolution TIF image package and product drawing are also identified in the source materials.

Final Assessment

The RDL ST-MPA48 offers a focused solution for powering two microphone channels with fixed P48 48 Vdc phantom voltage. Its IEC 61938:2013 specification, wide 10.5 Vdc to 26 Vdc input range, and detailed 20 Hz to 100 kHz response rating define its capabilities without ambiguity. For installations based on an external 12 V battery or 24 V supply, it provides documented voltage, current, load, and environmental requirements for informed integration.