NEXO NXAMP 4X1 Owner's Manual - Yamaha Commercial Audio

BLOCK DIAGRAM DESCRIPTIONPatching and routing (1)Basically, any combination of the four XLR analog inputs (numbered A to D on the backpanel) can be patched to each channel of the amplifier. If an expansion board is fitted, thefour added digital input (numbered A to D also) can be mixed as well. In this patch section,digital gain and adjustment delay are also added to optimized signal to noise on the audiopath and to ensure propagation delay equal to NX242 TDcontroller.N.B.: There is no reason why analog and digital input should be in phase, so werecommend a great care when patching both analog and digital input to the same channel(it should be done most of the time only as a backup solution, to ensure analog feeding tothe amplifier instantaneously instead of digital input for example if the digital input goesdown).Delay & polarity inversion (2)Factory set-up delayNote that each output may contain a small phase adjustment delay at the crossover point.Also, a polarity inversion may be performed. These adjustments are part of the factory setupsand are necessary to time-align the corresponding cabinet that is selected.User set-up delayThe user can adjust the delay for each channel (see further about the delay menu, or delaysetting from the ESmonitor). The maximum delay allowed is 66.6 meters per channel.N.B.: This user delay will be added to the converter latency, DSP buffering latency andfactory set-up delay.The NXAMP4x1 TDcontroller will limit the delay adjustment to a group of channel in specificcase such as:• Active setups where two different channels are in the same physical cabinet: it isthen impossible to delay one channel without the other one (for example PS15 Activesetup, delay is linked between HF and LF).Equalisation & Filtering• Cardioids setups will also prevent to adjust the delay on one channel only (forexample CD18 setup, delay is linked between front and rear loudspeaker).Subsonic and VHF filtering (3)Low and high-pass filters are used to filter out frequency components that could possiblydegrade the performance of the NXAMP4x1 Powered TDcontroller and loudspeakersconnected (depending on the cabinet setup chosen). The filters are optimised to work inconjunction with overall system response.The high pass filters are also extremely important as they optimise excursion at very lowPAGE 31 OF 80