Aes/Ebu Wiring; Cable Length Versus Sampling Frequency; Wiring - L-Acoustics LA-AES3 Manuel D'utilisation

6.2

AES/EBU wiring

6.2.1

Cable length versus sampling frequency

Connecting the digital audio source (digital mixing desk or digital audio network AES/EBU bridge) to a set of amplified
controllers requires to physically wire the devices to each other [6.2.2] using XLR cables.
The quality required for the XLR cables will depend on the cable length and the signal sampling frequency. As a starting
point, a standard balanced microphone cable of maximum length of 50 m/150 ft can be used to transport a signal of
maximum sampling frequency of 48 kHz. Higher sampling frequencies may require reducing the cable length since the
signal attenuation in cables increases in line with the sampling frequency.
As AES/EBU certified cables provide smaller attenuation/length ratio, it is highly recommended to use them in
installations requiring long cable runs or high sampling frequency signals.
Amplified controllers and 48 kHz digital audio source can be interconnected using AES/EBU certified
cables of maximum length of 300 m/1000 ft (typical).
If the source is of S/PDIF type, use cables of maximum length of 5 m/15 ft (typical).
IMPORTANT
In case of transmission losses, try to reduce the sampling frequency of the digital audio source.
Moreover, as a general rule, avoid using sources rated beyond 96 kHz as the maximum possible cable
length will be reduced while the additional information will anyway be cancelled by SRC to 96 kHz.
IMPORTANT
6.2.2

Wiring

After the LA-AES3 board has been mounted, the amplified controller's back side features 3 connection panels
(Figure 7): L-NET for remote control with LA NETWORK MANAGER Software, ANALOG for analog audio
distribution, and AES/EBU for digital audio distribution.
ANALOG panel
L-NET panel
AES/EBU panel
Figure 7: Connection panels located on the back side of an amplified controller
Both AES/EBU XLR connectors (IN and LINK) are transformer balanced and wired according to IEC 268 (see Figure 7).
The LINK connector is electronically buffered to allow daisy-chaining any number of amplified controllers. Use the
LINK connector to feed the IN connector of the next amplified controller (see Figure 8).
The LINK connector also features a failsafe relay to ensure wiring continuity in case of amplified controller shutdown.
LA-AE S3_UM_ML _2.0
2 1 1
2
3 3
w w w . l - a c o u s t i c s . c o m
1 = ground (shield)
2 = hot (pos. Signal)
3 = cold (neg. Signal)
11 en
EN