Inputs A, B, C, D 3 pin female XLR, electronically balanced. Inputs may be unbalanced without
affecting gain by linking cold pin to ground inside the mating connector.
Pin 1 Ground
Pin 2 Hot (Phase)
Pin 3 Cold (Non-phase)
Input Gain Individual multiturn adjustments for channel gain. Gain range -25 to +10dB.
Outputs 2 x 25 way D-type plug (male), electronically balanced. Outputs may be
individually unbalanced without affecting gain by linking cold/antiphase to
ground inside the mating connector.
Output 1/9: Hot (Phase) = Pin 1 Cold (Non-phase) = Pin 2 Ground = Pin 14
Output 2/10: Hot (Phase) = Pin 15 Cold (Non-phase) = Pin 16 Ground = Pin 3
Output 3/11: Hot (Phase) = Pin 4 Cold (Non-phase) = Pin 5 Ground = Pin 17
Output 4/12: Hot (Phase) = Pin 18 Cold (Non-phase) = Pin 19 Ground = Pin 6
Output 5/13: Hot (Phase) = Pin 7 Cold (Non-phase) = Pin 8 Ground = Pin 20
Output 6/14: Hot (Phase) = Pin 21 Cold (Non-phase) = Pin 22 Ground = Pin 9
Output 7/15: Hot (Phase) = Pin 10 Cold (Non-phase) = Pin 11 Ground = Pin 23
Output 8/16: Hot (Phase) = Pin 24 Cold (Non-phase) = Pin 25 Ground = Pin 12
Signal LEDs: Illuminate in the presence of a signal level greater than -17dBu (after gain).
Power LED Lights continuously to confirm correct operation of power supply.
Mains Fuse 20mm antisurge mains fuse.
250mA(T) for 230V units
500mA(T) for 115V units
DISCONNECT MAINS BEFORE ATTEMPTING TO CHANGE FUSE.
Mains IEC male connector.
Internal Option Links Selectable input impedance.
Assign internal mix busses.
Output source selectors.
5. Operation
Refer to section 4 for a description of the controls and connectors.
Internal Option Links
The DA-ITR4x16 is normally shipped as a dual stereo distribution amplifier with four outputs assigned
to each of the four inputs (see below). It is possible to select many other modes of operation through
the configuration of clearly marked internal links.
To adjust the links first disconnect mains power from the unit, then remove the ten lid screws and the
lid itself. Referring to both the information below and the enclosed block diagram, arrange the links
into the positions corresponding to the desired configuration. Replace and secure the lid before
reapplying power. Space is provided on the block diagram sheet for personal settings to be recorded.
Input Impedance
Four links, labelled “CH.A”....”CH.D”, select the input impedance of inputs A through D respectively. The
two settings available are 20kS (default - position marked “20K”) and 600S (position marked “600R”).
Mix Bus Belectors
Two blocks of links, labelled “MIX1" and “MIX2", allow any or all of the four inputs to be added to the
two internal mix busses. Each block accepts up to four pairs of jumpers (labelled A to D), one for each of
the inputs. Fitting a pair of jumpers feeds the corresponding input signal to the mix bus. As further
signals are added to the mix busses, the gain is automatically reduced to maintain headroom - i.e. if the
input levels (after any input gain is applied) are all 0dBu, the level on the mix bus will be 0dBu
regardless of whether one, two, three or four signals are routed to it. For correct operation it is
important that jumpers are only fitted in pairs.
Default configuration is inputs A and B fed to MIX1 and inputs C and D fed to MIX2, but sufficient
jumpers are supplied for any configuration.
Output Source Selectors
Sixteen blocks of links, labelled “O/P1"...“O/P16". On each block, a single jumper placed in one of the six
marked positions assigns the corresponding output to follow either one of the four input signals
(positions A, B, C or D) or one of the two internal mix busses (positions MIX1 or MIX2). For correct
operation it is essential that only one jumper is fitted to each block.
Default configuration: Outputs 1, 3, 5 and 7 assigned to input A
Outputs 2, 4, 6 and 8 assigned to input B
Outputs 9, 11, 13 and 15 assigned to input C
Outputs 10, 12, 14 and 16 assigned to input D
Connections
Inputs
Refer to section 4 of this manual for the pin connections of the female XLR sockets. For unbalanced use,
link cold/antiphase (pin 3) to ground (pin 1) inside the mating connector and apply the signal between
hot/phase (pin 2) and ground. To achieve specified performance, leads should be of quality screened
cable and not exceed 10m in length
Outputs
Refer to section 4 of this manual for the pin connections of the male D-type plugs. For unbalanced use,
link the cold/non-phase pin to the corresponding ground pin inside the mating connector and take the
unbalanced signal between the hot/phase pin and ground. To achieve specified performance, leads
should be of quality screened cable.
Input Gain Adjustment
Apply the expected input signal level to the DA-ITR4x16. Monitor the output and adjust the gain
control (clockwise to increase gain) to give the level required. The signal present LEDs illuminate when
a signal level greater than -17dBu (after gain has been applied) is present.
6. Specifications
Inputs Electronically balanced, 20kohm or 600ohm input
impedance
Maximum input level +26dBu
Input CMRR -60dB typical
Outputs Electronically balanced
Maximum output level +26dBu (into 10kohm), +25.5dBu (into 600ohm)
Nominal gain range -25dB to +10dB
Noise < -90dB (RMS, 20Hz-22kHz, 0dB gain)
Harmonic distortion < 0.01% (100Hz-10kHz)
Interchannel crosstalk < -80dB (1kHz, 0dB gain)
AF response ±0.1dB (20Hz-20kHz)
Power supply 115 or 230V AC
Power consumption 24VA
Dimensions 483mm x 145mm x 44mm
Weight 1.7kg unpacked, 1.9kg packed
