What is it?A dual digital microphone amplifier DetailsThe RB-DMA2 incorporates two independent low-noise microphone pre-amplifiers for converting microphone level signals to a digital AES/EBU or S/PDIF output. Individual analogue balanced line-level outputs are also produced for use with talkback systems, for example. The unit can either be used as two independent microphone amplifiers or one mic input can be copied to both channels of the digital output. Microphone inputs are XLR-3 type and electronically balanced. Gain for each input can be adjusted individually via a front-panel control, allowing connection of a wide range of dynamic and powered microphones. Each input includes an LED level indicator and there are independent switches to control high-pass filtering (offering low-frequency roll-off at 125Hz) and to provide phantom power at +48V. The RB-DMA2 has a dynamic range of >110dB and produces <0.01% THD (@1kHz). It incorporates AES/EBU, S/PDIF and TTL word clock sync inputs and has the same sync modes, bit depth selection, channel status bit adjustment, front panel LED synchronisation and calibration routine as Sonifex’s RB-ADDA.