DDA-212 Series 2 Digital Audio Distribution Amplifiers are designed to regenerate, isolate and distribute digital audio data formatted in accordance with specifications AES3-1992 and IEC 958. This is commonly called AES/EBU formatting or AES3.
DDA-212 Series 2 units have two inputs and 12 outputs, with the assignment of inputs and
outputs configurable from a front panel switch. The unit may be operated as a Dual 1X6 or
as a 2-Input 1X12, depending on the Input Select switch setting. The selected input feeds
AES audio to either six or all 12 separate outputs.
A front panel switch selects either re-clocking or non-reclocking of the input signal. In most
cases, re-clocking is preferred, as this feature improves the integrity of weak or distorted
input signals. Re-clocking may be switched off to allow distribution of AES sync signals,
Dolby E encoded AES signals, or other signals that should not be re-clocked.
DDA-212 Series 2 units work with AES signals that contain sample rates from 27 through
192kHz and 16-bit through 24-bit density, thus permitting very high resolution signals to be
The front panel displays full status of the input signal, including Sample rate, Word Length,
Digital Errors and Pro or Consumer Mode.
DDA-212 Series 2 units contain a unique automatic equalization function that can adjust for
extremely long input lines. Equalization works independently for each input. A Front Panel
Lock feature protects all your settings.
The Model DDA-212XLR uses XLR connectors and operates from and drives a 110-ohm
balanced shielded twisted pair distribution system per AES3-1992.
Input Loop-through connections for each of the two inputs are provided to permit multiple
units to be stacked, or to insert the DDA-212 into your digital workflow. Switchable line
termination is provided. Standard practice dictates that the last AES input be terminated;
therefore, if you are not using the loop-through feature, Input Termination should be
• Configurable for Dual 1X6 or 2-Input 1X12 operation
• Accepts sample rates from 27 to 192kHz
• Displays standard sample rates of 32, 44.1, 48, 88.2, 96, 176.4 and 192 kHz
• Displays Word Length of 16, 18, 20 and 24 bit
• Status and error LEDs show clock lock and data validity
• Automatic input equalizers compensate for very long cable runs
• Switchable re-clocking regenerates stable data before distribution
• Loop thru transformer balanced and isolated inputs
• Switchable input termination
• Individual, transformer balanced and isolated 110-ohm XLR outputs
• Two front-panel-selectable inputs
• 12 outputs
• Front panel control locking system
• Quiet, internal linear power supply (DDA-212XLR Input voltage is 115Vac. But it
has a 230Vac version also, just add “230V” at the end of the model number to
• Attractive and rugged 1RU package
XLR female or BNC; paralleled input connectors for loop-thru expansion
XLR 0.2Vp-p minimum; BNC 0.1Vp-p minimum
Transformer isolated, balanced and floating, XLR 110 ohms, BNC 75 ohms; terminating resistors may be switched in or out via front panel control
27 to 192kHz
> 1000 feet (300 meters) of 110 ohm cable with equalizer; 75 ohm coax allows longer runs
Automatic EQ for long lines via front panel push button
Regenerated from input signal with dual mode PLL or non-reclocked to preserve Surround coding, switchable
XLR Male or BNC Female, 6 or 12 depending on model
XLR 4Vp-p loaded; BNC 2Vp-p loaded
XLR 110 ohms, balanced and transformer isolated; BNC 75 ohms, unbalanced
< 300 picoseconds peak to peak.
< 25 nanoseconds
(DDA-212 Only) Input 1, Input 2; identifies input with error condition
INPUT SAMPLE RATE
32, 44.1, 48, 88.2, 96, 176.4 and 192 kHz
INPUT WORD LENGTH
16, 18, 20 and 24 bits
INPUT DIGITAL ERRORS
Bi-Phase/Parity, Validity, Non-Linear PCM, DTS-CD Signal
INPUT CABLE EQ
DDA-106: 1, 2;
DDA-212: 1, Bridge, 2
LED indicates power is applied
Internal Supply, 115/230VAC (selectable via internal jumper) ±10%, 50/60Hz, 10VA, IEC320 3 pin connector
19” W x 1.75“ H x 8.5” D; 9 lbs.
Limited, One Year Warranty