L-ACOUSTICS LA8 [16/56] La la la la888
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L-ACOUSTICS LA8 [16/56] La la la la888

L-ACOUSTICS LA8 [16/56] La la la la888
LA
LALA
LA8
88
8
AMPLIFIED CONTROLLER
AMPLIFIED CONTROLLERAMPLIFIED CONTROLLER
AMPLIFIED CONTROLLER
USER MANUAL
USER MANUALUSER MANUAL
USER MANUAL
VERSION 4.0
LA8_UM_EN_4-0
w w w . l - a c o u s t i c s . c o m
14
1414
14
5.2.2 AES/EBU digital input
The LA8 can be fed with one AES/EBU digital audio signal carrying two audio channels, thanks to the LA-AES3 board.
This one offers one input port, one active link port (see Figure 3) and a Sample Rate Converter (SRC).
The AES/EBU input port is ESD protected and equipped with one XLR3 female connector (transformer balanced). It
allows the LA8 to receive two digital audio channels coming from a digital mixing desk or a digital audio network bridge
compliant with the AES/EBU (AES3) or coaxial S/PDIF (IEC 60958 Type II) digital audio standards.
The AES/EBU link port is ESD protected and equipped with one XLR3 male connector (transformer balanced). It
allows transmitting the input signal to daisy-chained amplified controllers.
The SRC embedded in the LA-AES3 board has been selected to support a wide range of input formats (16-24 bits/
44.1-192 kHz). It converts any of them to the 24 bits/96 kHz internal format used by the amplified controller. The SRC
is a high-quality hardware component (140 dB dynamic range, THD+N<-120 dBfs, strong input jitter attenuation) and
provides constant propagation delay regardless of the input sampling frequency. There is no external synchronization
mode. The amplified controller’s clock always runs using its high-precision internal quartz at 96 kHz. It ensures low
jitter and high audio quality while preserving isophase required for line source systems.
Note: Keeping the signal in the digital domain by using the LA-AES3 board will provide the following benefits (with any
digital mixing desk or any audio network) compared to the analog signal distribution:
•
Better audio quality by removing one Analog/Digital conversion cycle.
•
Better dynamics thanks to the digital links’ immunity to ground loops.
•
Optimized level chain by removing the risk of level misalignment between console and amplified controllers.
•
Possibility to reduce the amplified controller
propagation delay by 0.5 ms.
•
Digital signal refreshed at each amplified controller in a daisy-chain.
• Improved maximum cable length. The LA-AES3 has been tested with up to 305 m/1000 ft of 3 types of AES/EBU
rated cables: BELDEN
®
1696A, KLOTZ a.i.s.
®
OT234H, and SOMMER Cable
®
SC BINARY 234 (single cuts, digital
source signal running at Fs = 48 kHz).
5.2.3 DSP architecture
The proprietary algorithms allows optimum performance and protection of each individual transducer of the
L-ACOUSTICS
®
system in use for an even more natural, transparent, and realistic sound experience.
•
The DSP engine is a SHARC 32 bit floating point DSP at 96 kHz sampling rate. Compared to fixed point DSP,
it offers enhanced dynamic range and precision, allowing much better headroom and signal-to-quantification-
noise ratio.
•
A special engineering approach combining IIR and FIR filters generates a perfect linearization of phase curves
and therefore a significant improvement of the system impulse response.
•
The 2 x 4 matrix architecture offers flexibility for various system configurations.
•
The L-DRIVE transducer protection system offers advanced protection by regulating both excursion and
temperature of the transducer [10.2].
•
The flash memory offers a quick access to 89 factory presets and 10 user memory locations, allowing the
user to deal with all the usual L-ACOUSTICS
®
speaker system configurations (refer to the LA4-8 PRESET
LIBRARIES User manual included in the LA8 PRESET LIBRARY Pack [3.4]).

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