L-Acoustics LA8 User Manual
Also see for LA8: Owner's manualOwner's manualUser manualUser manualMaintenance manual
                                                | |
Contents
| 
LA 8_U M_E N_5 .0 w w w . l - a c o u s t i c s . c o m 1 12.2 Signal processing and amplification2.2.1 Analog inputThe LA8 can be fed with two balanced analog audio signals using the appropriate XLR input ports (see Figure 2). Eachof the analog input ports is ESD protected and equipped with one XLR3 female connector.The analog input panel also features two XLR link ports passively connected to the input ports. It allows transmittingthe input signals to daisy-chained amplified controllers. Each of the analog link ports is ESD protected and equippedwith one XLR3 male connector.To be processed by the DSP, the analog signal needs to be converted into a digital signal. For this purpose, the LA8amplified controller is fitted with two cascaded 24-bit A/D converters with a sampling rate of 96 kHz allowing anencoding dynamic range of 130 dB.2.2.2 AES/EBU digital inputThe LA8 can be fed with one AES/EBU digital audio signal carrying two audio channels, thanks to the LA-AES3 card.The card features an XLR input port (see Figure 2), an active XLR link port, and a Sample Rate Converter (SRC).The AES/EBU input port is ESD protected and equipped with one XLR3 female connector (transformer balanced). Itallows the LA8 to receive two digital audio channels coming from a digital mixing desk or a digital audio network bridgecompliant 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). Itallows 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 SRCis a high-quality hardware component (140 dB dynamic range, THD+N<-120 dBfs, strong input jitter attenuation) andprovides constant propagation delay regardless of the input sampling frequency. There is no external synchronizationmode. The amplified controller’s clock always runs using its high-precision internal quartz at 96 kHz. It ensures lowjitter and high audio quality while preventing phase shift, as required for line source systems.Digital domain benefitsKeeping the signal in the digital domain using the LA-AES3 board will provide the following benefits (with anydigital mixing desk or any audio network) compared to the analog signal distribution: Better audio quality by removing one D/A - A/D 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 models ofAES/EBU rated cables: Belden® 1696A, Klotz Cables® OT234H, and Sommer Cable® SC BINARY 234 (singlecuts, digital source signal running at Fs = 48 kHz). |
This manual is suitable for:
manualsdatabase
Your AI-powered manual search engine