6 . 9
O p e r a t i n g Te m p e r a t u r e
The operating temperature range is 32° F to 131° F / 0°C to 55° C.
6 . 1 0
I n p u t C o n n e c t i o n s
6.10.1
ANALOG SIGNAL INPUT CONNECTION
The two XLR-type connectors on the rear of each NTL720, one female and one male, are designed for
professional audio signal levels, nominally 0 dBu (= 0.775 V). Normally, use the female XLR as the
signal input. Use the male XLR as a loop-thru output to connect the same signal input to additional
NTL720s.
To use these connectors for analog audio input signals, repeatedly press the associated momentary
INPUT SELECT switch, cycling through the LED indications until only the NORM/ANALOG LED is
illuminated.
Cable:
2 conductor plus shield
Mating Connector:
XLR-3 male
PIN 1
Shield
PIN 2
Plus / Hot
PIN 3
Minus / Cold
6.10.2
DIGITAL SIGNAL INPUT CONNECTION
The two XLR-type connectors used for analog audio signals are also used for digital audio signals.
These are designed for the AES/EBU digital signal (AES3 Standard). Use the female XLR as the signal
input. Use the male XLR as a loop-thru output to connect the same signal input to additional NTL720s.
To use these connectors for digital audio input signals, repeatedly press the associated momentary
INPUT SELECT switch, cycling through the LED indications until either the AES/EBU Ch 1 or the
AES/EBU Ch 2 LED is illuminated.
Channel 1 and Channel 2 are also referred to as Subframe 1 and Subframe 2.
Cable:
2 conductor plus shield
Mating Connector:
XLR-3 male
PIN 1
Signal earth (shield)
PIN 2
Signal
PIN 3
Signal
IMPORTANT:
Looping an AES/EBU signal to another NTL720 or other audio device’s analog input
will result in audible digital noise at potentially high levels. Make sure the downstream device’s input
accepts an AES/EBU (AES3) digital input signal.
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12
ALL ON = U-NET INPUT
INPUT SELECT
FLASHING = USER DSP ENABLE
CONSTANT = USER DSP DISABLE
AES/EBU
CH 2
AES/EBU
CH 1
NORM/
ANALOG
INPUT
LOOP
2
3 Signal -
Shield
2
3 Signal -
1
ALL ON = U-NET INPUT
INPUT SELECT
FLASHING = USER DSP ENABLE
CONSTANT = USER DSP DISABLE
AES/EBU
CH 2
AES/EBU
CH 1
NORM/
ANALOG
INPUT
LOOP
2
1
3
3
2
1
2 Signal
3 Signal
2 Signal
3 Signal
Signal
Earth
(cable
shield)
Summary of Contents for N T L 7 2 0
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