Manual

Chapter 8 - RB-DMA2 Dual Digital Microphone Amplifier
Redbox User Handbook 8-7
• In Slave Sync Mode, switch position D, the digital output sample rate follows
the digital input. When the digital input signal is not present the digital output is
turned off.
The following table, also printed on the top of the unit, summarises the above settings
and shows the sample rate generated by the internal clock generator in master and
auto sync modes.
Fig 8-7: RB-DMA2 Frequency and Sync Rotary Switch
Selections
8.4.3.6. Test/Calibration Mode
For optimum performance of the RB-DMA2, the unit should be calibrated when it has
been powered up for approximately 10-15 minutes. The circuitry and chipsets
contained in the unit will warm up during this time and the performance will
deteriorate unless calibrated (the noise floor and dynamic range will be 1-2dB lower
than the best possible performance). The calibration cycle calibrates the gain and the
zero reference of the A/D converter.
To calibrate the RB-DMA2, set the rotary FREQUENCIES AND SYNC MODES switch to
position “F”. The power LED on the front panel will flash quickly for 2 – 3 seconds and
will illuminate fully when the unit is calibrated. Once calibration is complete, reset the
rotary switch to the position that you require.
8.5. Technical Specifications
8.5.1. Connections
Analogue Mic Inputs: 2 x XLR 3 pin (balanced)
Analogue Line Outputs: 2 x XLR 3 pin (balanced)
Digital Sync Inputs: 1 x AES/EBU XLR 3 pin female
1 x S/PDIF RCA phono
1 x TTL BNC female (sync) 50 ohm impedance
Digital Outputs: 1 x AES/EBU XLR 3 pin plug
1 x S/PDIF RCA phono socket
Mains Input: Filtered IEC, 110-120V, or 220-240V switchable,
fused 10W max
kHz 32 44.1 48 64 88.2 96
MASTER012345
AUTO6789
A
B
AUTO LOCK = C SLAVE MODE = D CALIBRATION MODE = F
FREQUENCIES AND SYNC MODES