Manual

Chapter 8 - RB-DMA2 Dual Digital Microphone Amplifier

Redbox User Handbook 8-5

8.4.2. RB-DMA2 Outputs

8.4.2.1. AES/EBU Output

The digital output XLR 3 pin socket has an impedance of 110Ω and the signals on this

connector comply with the IEC 60968 specification. It has the following connections :

Pin 1: Screen

Pin 2: Phase

Pin 3: Non-phase

8.4.2.2. S/PDIF Output

The digital output S/PDIF phono output has an impedance of 75Ω.

8.4.2.3. Analogue Line Outputs

There is an analogue output on XLR 3 pin plug for each microphone input. The plug

has the following connections:

Pin 1: Screen

Pin 2: Phase

Pin 3: Non-phase

8.4.3. Rear Panel Controls

8.4.3.1. Status Select Switches

These switches are used to determine the status or content of the digital output

signals. The type of information encoded in the channel status bits of a digital audio

signal can be professional or consumer and is determined by switch 1. However at

frame rates higher than 48kHz, consumer mode is not available, so professional mode

is used and this switch will be ignored.

The sample size for the analogue to digital conversion can be set to 24, 20 or 16 bits

(switches 3 & 4). When the signal is truncated from 24 bits, a psycho-acoustic filter is

applied to maintain optimum signal quality. These settings are summarised below and

also on the top panel of the unit.

1ON

1OFF

2ON

2OFF

16 20 24

3 OFF ON ON

4OFF OFF ON

MONO

BITS

STATUS

PROFESSIONAL

CONSUMER

DUAL MONO

Fig 8-6: RB-DMA2 Status Select Switches