The Attero Tech by QSC unD4I-L is a four-channel Dante/AES67 audio interface that
allows for integration of analog mic/line sources into networked AV systems, such as the
Q-SYS Ecosystem. It features four balanced mic/line inputs, each with eight softwareselectable gain presets and +48 V phantom power.
The logic I/O (4 x 4) offers an easy interface with microphone switches and indicator
LEDs. Front panel indicators show each channel’s gain and phantom power status for
easy troubleshooting. The unD4I-L also has two network connections to allow for daisychaining of one additional unD4I-L, and can be powered by either external +24 V DC or
any PoE network switch.
Gain and phantom power
status LEDs
Shows the gain/pad setting and phantom
power status for each of the four input
channels.
Power/ID LED
Indicates power when the unit is on,
and blinks in response to a software command
for unit identification
General
Mic/line input type Balanced and RF filtered
Phantom power +48 V, software-selectable
Mic/line gain
0 dB, +15 dB, +30 dB, and +45 dB, all
software selectable. 12 dB pad, software
selectable
Input impedance >1.8 kΩ at any gain setting
Equivalent input noise -115 dBu (+45 dB gain)
Maximum input levels
+8 dBu @ 0 dB gain
-7 dBu @ +15 dB gain
-22 dBu @ +30 dB gain
-37 dBu @ +45 dB gain without 12 dB pad.
With 12 dB pad: maximum input levels are
12 dB higher
System THD <.02% at any gain, input signal 3 dB below
maximum
Frequency response 20 Hz - 20 kHz, +/-1 dB
Logic inputs 0-3.3 V DC input range, can indicate both
hi/low and analog range
Logic outputs 10 mA source current @ 3 VDC, 50 mA sink
current from 5 VDC up to 24 VDC
PoE class Class 0 802.3af PoE PD compliant
Regulatory compliance FCC Part 15 Class A, CE (EN 55022 Class
A)
Dimensions (HWD) 1.5 x 8.3 x 4.7 in
(38.1 x 210.8 x 119.4 mm)
Weight 1.38 lbs (.63 kg)
Operating temperature 0 to 40° C
Rear Panel
Mic/line inputs 1-4
Balanced and RF filtered inputs. Softwareselectable gain presets:
Without pad: 0 dB, +15 dB, +30 dB, +45 dB
With pad: -12 dB, +3 db, +18 dB, and +33 dB
+48 V phantom power on each channel
RJ-45 ethernet connectors
The left RJ-45 connects to an Ethernet switch
(PoE or non-PoE) and also provides the DC
input for daisy chained units. The right RJ-45
provides DC out to daisy chained units.
+24 V DC input Allows the unD4I-L to be powered
if a PoE Ethernet switch is not used.
Power link in/out Allows DC power to be daisy chained between
multiple units.
Logic inputs 1-4
Allows external contact closures to be sensed
and UDP messages to be triggered to external
devices.
Logic outputs 1-4
Allows LEDs and other low current devices
to be driven based on UDP messages from
external devices.
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