Mic/Line Bi-Directional Network Interface-2 Switchable Mic or Line Inputs, Dante Input-2 Balanced Line Outputs, Dante Output

The RDL RU-MLB2 is a bi-directional network audio interface for converting two conventional microphone or line-level sources into Dante channels while converting two Dante channels back to balanced analog line outputs. Its automatic microphone gain, selectable input modes, P48 phantom power, 24-bit conversion, and clear signal monitoring support dependable integration without user or installer gain adjustments.

Ideal Use Cases

This model is designed for Dante installations that require analog audio to travel in both directions. Two local input channels can connect microphone or line-level sources to the network, while two received Dante channels are converted to balanced +4 dBu outputs. Each input is independently switch-selectable for microphone or line operation, making the interface suitable where different source types must share a compact network endpoint.

It is particularly useful when an installation needs two channels of analog-to-Dante conversion and two channels of Dante-to-analog conversion in one device. Rack-mounting and surface-mounting support allows the unit to be positioned according to the requirements of the equipment layout.

Why Choose This Model

The RU-MLB2 simplifies microphone configuration through automatic gain selection. It applies 40 dB of gain for condenser microphones and 60 dB for dynamic microphones, eliminating separate user or installer gain adjustments. Each microphone input also provides P48 48 Vdc phantom power compliant with IEC 61938: 2013.

When an input is switched to line mode, it accepts unbalanced -10 dBV or balanced +4 dBu signals with more than 18 dB of headroom. On the output side, the two balanced detachable-terminal-block connections deliver a nominal +4 dBu level with more than 18 dB of headroom. This combination supports common professional and unbalanced line operating levels while retaining a consistent Dante interface.

Installation and Integration

The network connection uses an RJ45 port with Ethernet Link and Speed indicators and operates at a 100 Mbps transmission rate. Dante audio is supported at 44.1 kHz and 48 kHz, with 48 kHz as the default sample rate. Rear-panel MIC or LINE selectors provide direct configuration for the two analog inputs.

Analog inputs and outputs use detachable terminal blocks. Power can be connected through either the power jack or a detachable terminal block. The RU-MLB2 requires 24 Vdc at 175 mA plus the load from connected phantom-powered microphones. The listed recommended power supplies are the PS-24AS for the USA and PS-24AX for international use. PoE and hot-standby operation apply to the separate RU-MLB2P model.

The enclosure measures 5.8 inches wide by 1.7 inches high by 5.2 inches deep. It is equipped for rack or surface mounting and is specified for ambient operating temperatures from 0 degrees C to 40 degrees C.

Performance Highlights

High-resolution 24-bit analog-to-digital and digital-to-analog conversion handles audio in both directions. The supported frequency response is 20 Hz to 20 kHz within plus or minus 0.5 dB, with THD+N below 0.1 percent. Noise is specified below -70 dB relative to +4 dBu, while common-mode rejection is greater than 70 dB from 50 to 120 Hz.

The operating-level relationship is 18 dBFS at +4 dBu. Balanced output impedance is 150 ohms, or 75 ohms when used unbalanced. RDL analog filtering complements the digital conversion and is intended to enhance overall audio performance.

Dedicated front-panel signal LEDs show activity for each analog input. Two additional output signal LEDs indicate audio on the received network channels. Network System and Sync indicators provide status visibility, while the RJ45 Link and Speed indicators help confirm the Ethernet connection.

What Makes It Different

The RU-MLB2 combines two Dante transmit paths and two Dante receive paths with automatic microphone gain in a single compact interface. Instead of requiring manual gain calibration when changing between condenser and dynamic microphones, the unit applies the specified gain automatically. Independent MIC or LINE selection also allows the two input channels to be configured for their connected sources.

Its input flexibility is matched by professional balanced analog outputs, P48 phantom power on each microphone input, detachable terminal-block wiring, and local indicators for audio and network state. These features make configuration and operational checks available directly at the hardware.

Final Assessment

For systems requiring two-channel analog input and output access to a Dante network, the RU-MLB2 provides a focused combination of automatic microphone handling, line-level compatibility, 24-bit conversion, and visible signal monitoring. Its balanced +4 dBu outputs, selectable inputs, compact dimensions, and rack or surface mounting options support straightforward integration into fixed network-audio installations.