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AUDIO INTERFACES
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DIGITAL AUDIO CONVERTERS
Redbox - Digital - Audio Converters
RB-ADDA2 A/D and D/A Converter, 24 bit 192kHz (continued...)
the content of the channel status bits
embedded within the digital audio
stream. The status bits can be forced to
either Professional Mode (PRO), Consumer
Mode (CON) or to follow the mode of the
input (FOLLOW).
The SYNC button is used to select the
synchronisationinput,fromWordClock,
AES/EBU or the D/A input, and also the
synchronisationmodeofthedigital
output. The A/D section of the RB-ADDA2
operates in four selectable modes:
Master Mode
In this mode the unit receives an analogue
audio signal, which is digitised and
formatted for digital serial transmission
(IEC958).Thenecessaryclocksignalsare
generatedinternallyfromanonboard
masterclockataselectablerate(32kHz,
44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz
or 192kHz).
Slave Mode
Inthismodetheunitissynchronisedto
anexternalsource,usingthedigitalaudio
syncorD/Ainputsignalfromwhichthe
clock signals are stripped, or to the TTL
level Word Clock. The FREQUENCY LED
willindicatethesynchronisedsample
frequencyandifnosyncispresent,no
output will be generated.
Auto Mode
Here,theunitissynchronisedtoan
externalsource,usingthedigitalaudio
syncorD/Ainputsignalfromwhich
the clock signals are stripped, or to the
TTLlevelWordClock.Ifnosyncsignalis
present the unit runs from the onboard
masterclockatarateselectedbythe
frontpanelcontrol(32kHz,44.1kHz,48kHz,
88.2kHz, 96kHz, 176.4kHz or 192kHz).
Auto Lock Mode
Thisoperatesliketheautomodeexcept
thatifnosyncsignalispresentthe
unit will run at the closest master clock
rate to the last locked incoming signal.
The FREQUENCY LED will indicate the
synchronisedsamplefrequency.
Whenoperatinginsyncmodes,theSYNC
button ashes whenever the unit is not
synchronisedtotheincomingdigitalsignal.
The D/A section has one SOURCE push-
button which is used to select the digital
input source from AES/EBU, S/PDIF or
TOSlink optical and which also sets the
analogue output level to be generated
for full scale digits, from either +12dBFS,
+18dBFSor+24dBFS.Therearefactory-set
internal level controls for ne tuning the
analogueoutputgainadjustment.Ifno
digital audio source is present, the D/A
SOURCE button ashes.
TheRB-ADDA2automaticallydecodes
50/15µsemphasisifthisisindicatedby
certain channel status bits in the incoming
digital audio data.
In both A/D and D/A sections, audio is sent
toalloftheoutputssimultaneously.
A red LED indicates when power to the
RB-ADDA2 is on.
“
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The RB-ADDA2 is a high
performance, enhanced version of
the RB-ADDA but with additional
features.
Analogue to Digital Conversion
A/D Audio Specication For RB-ADDA2
Maximum +27dBubalancedinputs,+17dBu
Input Level: unbalanced inputs
Input >10kΩ unbalanced, >20kΩ bridging
Impedance: balanced
DynamicRange: >110dB
GainRange: Adjustableinputgainof±3dBon
selected +12dBu, +18dBu or +24dBu,
ref FSD
Distortion >96dB THD + N at 1kHz
& Noise:
A/D Connections
Analogue 2xXLR3pin(balanced)
Inputs: 2xRCAphono(unbalanced)
SyncInputs: 1xAES/EBUXLR3pinfemale
 1xTTLWordclockBNC
DigitalOutputs: 1xAES/EBUXLR3pinmale
 1xS/PDIFRCAphono
 1xTOSlinkoptical
SerialRS232: 1x9pinD-typeplug
MainsInput: FilteredIEC,continuouslyrated
 85-264VAC@47-63Hz,10Wmax
FuseRating: Anti-surgefuse1A20x5mm
A/D Operational Controls
Analogue Balanced XLR or unbalanced phono, via
Input Source: A/D SOURCE push-button
Analogue +12dBFS, +18dBFS or +24dBFS, via A/D
Input Level SOURCE push-button
for FSD:
Analogue +9dBu to +27dBu via rear-panel
Input Level pre-set pots
Adjust:
Sample 32kHz,44.1kHz,48kHz,88.2kHz,96kHz,
Frequency 176.4kHzor192kHz,viaFREQUENCY
Rates: push-button
Bit Depth: 16, 20 or 24 bits, via BITS push-button
Channel Consumer mode, professional mode or
Status Bits: follow input, via CS DATA push-button
SyncInput AES/EBU,WordClockorD/Ainput,via
Select: SYNC push-button
SyncMode Master,slave,auto,autolock,viaSYNC
Select: push-button
Digital to Analogue Conversion
D/A Audio Specication For RB-ADDA2
Maximum +24dBubalancedoutput,+14dBu
Output Level: unbalanced output
Output <50Ω balanced, <75Ω unbalanced
Impedance:
DynamicRange: >110dB
D/A Connections
DigitalInputs: 1xAES/EBUXLR3pinfemale
 1xS/PDIFRCAphono
 1xTOSlinkoptical
Analogue 2xXLR3pinmale(balanced)
Outputs: 2xRCAphono(unbalanced)
D/A Operational Controls
Digital AES/EBU, S/PDIF or TOSlink optical, via
Input Select: push-button
Analogue Selectable +12dBu, +18dBu or +24dBu
Output Level output level, ref FSD, via D/A SOURCE
for FSD: push-button
Equipment Type
RB-ADDA2: Combined A/D and D/A converter,
24 bit 192kHz
Physical Specication
Dimensions 48cm(W)x15.8cm(D*)x4.2cm(H)(1U)
(Raw): 19”(W)x6.2”(D*)x1.7”(H)(1U)
(Boxed): 59cm(W)x27.4cm(D*)x10.8cm(H)
 23.2”(W)x10.8”(D*)x4.3”(H)
Weight: Nett: 1.6kg Gross:2.3kg
 Nett: 3.5lbs Gross:5lbs
*Notethatthisproductisdeeperthanstandard
Redboxes.