RDL ST-MPA24 MICROPHONE 24 V PHANTOM ADAPTER - 2 CH

Ideal Use Cases

The RDL ST-MPA24 is intended for audio systems that need to add phantom-powered microphones to standard inputs. With two phantom adapters in one module, it supports two microphone channels without requiring a separate adapter module for each path. It is a practical choice when the microphones require P24 phantom power and the receiving inputs do not provide that function. The ST-MPA24 is particularly relevant when IEC-defined phantom operation, documented frequency response, and a clearly stated dc power requirement are important system criteria.

Why Choose This Model

The ST-MPA24 combines two-channel phantom conversion with an adjustable phantom voltage of up to the IEC-standard 24 Vdc level. Its P24 implementation follows IEC 61938:2013, providing a defined standard against which compatibility can be evaluated. RDL also specifies highly filtered phantom power and phantom conversion with full frequency response. These characteristics make the module a focused solution for adding phantom capability while preserving the stated audio bandwidth. The two-channel design is useful when a pair of microphone paths needs the same phantom-power arrangement.

Installation and Integration

Integration begins with three requirements: two phantom-powered microphone channels, standard receiving inputs, and a suitable external dc supply. The ST-MPA24 requires ground-referenced 24 Vdc power at 35 mA with a 20 mA 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. Phantom voltage is adjustable up to 24 Vdc, allowing the module to be configured to its specified IEC P24 level. The stated ambient operating range is 0° C to 55° C, which should be considered when selecting the installation location. Published documentation includes a PDF specification sheet, an engineering functional block CAD file, and front and end panel diagrams in American DXF format.

Performance Highlights

The specified frequency response extends from 20 Hz to 100 kHz with a tolerance of ±0.025 dB. This measurement is stated for a 150 Ω source and a 1 kΩ load, giving system designers the test conditions associated with the published result. That wide, tightly specified response supports the product’s stated purpose of phantom conversion with full frequency response. The highly filtered phantom-power design is another central performance characteristic, complementing the adjustable 24 Vdc phantom voltage. Together, these specifications define both the audio-path performance and phantom-power behavior without relying on unspecified operating claims.

What Makes It Different

The distinguishing feature of the ST-MPA24 is its combination of two phantom adapters, IEC-standard P24 operation, adjustable phantom voltage, and documented full-frequency-response conversion in one module. The phantom standard is identified specifically as IEC 61938:2013, while the phantom voltage is listed as P24, 24 Vdc. Its published source and load conditions make the frequency-response specification easier to assess during system planning. RDL also supplies engineering-oriented documentation formats, including PDF and American DXF resources. For logistics planning, the product ships in a cardboard box measuring 2 x 2 x 4 inches, with a shipping weight of 0.195 pounds and a listed WEEE weight of 0.145 pounds.

Final Assessment

The RDL ST-MPA24 is a specialized two-channel solution for adding P24 phantom-powered microphones to standard inputs. Its primary selection points are the 24 Vdc phantom format, IEC 61938:2013 standard, 20 Hz to 100 kHz response, and requirement for a ground-referenced 24 Vdc external supply. The recommended supply must be obtained separately. When those electrical and channel requirements match the intended system, the ST-MPA24 provides a clearly specified approach to two-channel phantom conversion with adjustable, highly filtered phantom power.