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The black DDB-BN31 4 x 4 Wall-Mounted Bi-Directional Mic/Line Dante Interface from RDL is a complete wall-mounted Dante audio network interface. It features two XLR mic or line inputs, one stereo mini-jack line input and one stereo mini-jack line output on the front panels, plus two line outputs on a rear panel detachable terminal block. Special software is not required to configure the DDB-BN31. Each XLR input provides three switches that may be set from the front of the unit when the cover plate is not installed. The first switch enables or disables P48 phantom for that input, second switch selects the mic or line gain range, and the third switch sets the gain. The mini-jack input provides a switch to configure the input for stereo or summed mono. The mini-jack output provides a switch to configure the output for stereo or left-channel mono. Each rear panel output provides a switch to set the output to balanced professional or unbalanced consumer level.
The DDB-BN31 fits a standard US dual-gang electrical box or an RDL WB-2 back box for installations in thinner European or equivalent walls. It is PoE powered and is available with optional customized graphics.
The two XLR inputs are each converted to a separate Dante network transmit channel. Three gain settings are switch-selectable for both the mic and line input ranges to match condenser or dynamic mic levels and standard line levels. The mini-jack left and right inputs are each converted to a separate Dante network transmit channel. Each input provides a network digital audio level of -20 dBFS for an unbalanced -10 dBV input. The input is equipped with a selector to sum the left and right mini-jack inputs. The summed signal feeds both Dante transmit channels.
The two Dante audio channels are converted to unbalanced line level to feed the front panel mini-jack. Each channel provides -10 dBV unbalanced for a network digital audio level of -20 dBFS. The left and right mini-jack channels are normally fed from Dante receive channels 3 and 4 (stereo). The mini-jack output is equipped with a selector to feed both output channels from Dante receive channel 3 (mono). This selector may be set from the front of the unit when the cover plate is not installed.
The two Dante audio channels are converted to balanced line level on the rear panel detachable terminal block. Each output provides +4 dBu balanced for a network digital audio level of -20 dBFS. Each output is equipped with a selector to unbalance the audio and attenuate the level to -10 dBV. These switches are located on the top of the chassis and are set by the installer prior to mounting the unit.
The rear panel outputs are intended for connection to RDL AMS connectors mounted in Decora-style plates that match the DDB-BN31. AMS audio connectors include RCA, mini, and XLR jacks. The output plate may be located together with the DDB-BN31 in a triple gang box or may be mounted remotely in a single box.
The valid PoE power and synchronization to the Dante network are indicated by green LEDs visible from the front of the unit. The DDB-BN31 features discrete mic preamplifiers for studio-quality fidelity and low-noise performance, coupled through metal XLR jacks housed in a stainless-steel chassis with dual powder-coated Decora front plates.