Line-Level Bi-Directional Network Interface-4 Balanced Line Inputs, Dante Input-4 Balanced Line Outputs, Dante Output-with PoE

The RDL RU-LB4P is a line-level bidirectional Dante network interface that connects four balanced analog inputs and four balanced analog outputs to a Dante audio network. It converts four professional or consumer line-level sources into Dante audio channels while providing four balanced line outputs for Dante audio. The unit supports 24-bit operation, 44.1 kHz and 48 kHz sample rates, 100 Mbps Ethernet, and either 24 Vdc or Power over Ethernet.

Ideal Use Cases

The RU-LB4P is suited to networked audio systems that require four channels of analog-to-Dante and Dante-to-analog conversion in one compact unit. Its balanced inputs and outputs accommodate professional line-level equipment, while the stated compatibility with consumer line-level sources broadens its usefulness when integrating different source types. Detachable terminal blocks make it appropriate for fixed installations where secure, organized audio wiring is preferred.

Its bidirectional channel configuration is particularly useful when an installation needs to place analog sources onto a Dante network while also receiving network audio at the same location. The 5.8-inch-wide enclosure fits applications where equipment space is limited.

Why Choose This Model

Four balanced inputs and four balanced outputs are combined with a Dante network connection, reducing the need for separate input and output interfaces. The inputs present an impedance greater than 20 kΩ, while the outputs provide a nominal +4 dBu level with 150 Ω balanced or 75 Ω unbalanced output impedance.

The RU-LB4P also provides detailed operating feedback through 17 indicators. These include a Power In indicator, four output signal LEDs, eight input dual-LED VU meter indicators, two network Sys and Sync indicators, and Ethernet Link and Speed indicators. This collection of visual status information helps installers confirm signal activity, network synchronization, and Ethernet operation directly from the unit.

Installation and Integration

Analog inputs and outputs connect through detachable terminal blocks. Network connectivity is provided by an RJ45 connector with Link and Speed indicators, operating at a transmission rate of 100 Mbps. The supported digital audio Ethernet protocol is Dante.

Power can be supplied through 24 Vdc at 140 mA plus connected loads or through Class 0 IEEE 802.3af PoE. Two local power connections are available: a power jack and a detachable terminal block. The recommended power supplies listed in the source data are the PS-24AS for the USA and the PS-24AX for international use.

The enclosure measures 5.8 inches wide by 1.7 inches high by 5.2 inches deep, equivalent to 15 by 4.3 by 13.2 centimeters. Its specified ambient operating range is 0°C to 40°C.

Performance Highlights

The RU-LB4P supports 24-bit audio at 44.1 kHz or 48 kHz, with 48 kHz designated as the default sample rate. Its audio operating reference is 18 dBFS equals +4 dBu. Frequency response is specified from 20 Hz to 20 kHz within ±0.5 dB, and THD+N is below 0.05%.

Noise below +4 dBu is specified at less than -80 dB with the output active and less than -95 dB when the outputs are muted. Common-mode rejection is greater than 60 dB from 50 Hz to 120 Hz. Crosstalk is specified at less than 85 dB from 20 Hz to 20 kHz, while available headroom above +4 dBu is greater than 18 dB. Maximum input level is listed as +22 dBu, and the balanced outputs operate at a nominal +4 dBu.

What Makes It Different

The distinguishing feature of the RU-LB4P is its combination of four analog inputs, four analog outputs, bidirectional Dante conversion, and PoE support. The choice of PoE or local 24 Vdc power offers two documented methods of powering the interface. Balanced detachable-terminal audio connections support fixed wiring, while the RJ45 network port consolidates four transmit and four receive channels through the Dante connection.

Signal, metering, synchronization, and Ethernet status indicators provide more information than a basic power light, giving installers direct visibility into both the analog and network sides of the interface.

Final Assessment

The RDL RU-LB4P provides a focused solution for connecting four balanced line inputs and four balanced line outputs to a Dante network. Its 24-bit audio support, 44.1/48 kHz operation, specified 20 Hz to 20 kHz frequency response, detachable terminal connections, extensive status indication, and IEEE 802.3af PoE support make its capabilities clear for bidirectional line-level network audio integration.