NXAMP4x1 & NXAMP4x4 User Manual - Nexo

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 E to H) can be mixed as well. In this patch section,digital gain is also added to optimized signal to noise on the audio path.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 for example if the digital input goes down).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 NXAMP 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).• Cardioids setups will also prevent to adjust the delay on one channel only (forexample CD18 setup, delay is linked between front and rear loudspeaker).Equalisation & Filtering• In the particular case of the RS subs in Omni, the two channels of amplifiersdedicated to RS output are linked also together to prevent setups errors whencabling directly RS in Omni mode to amplifier outputs.Subsonic and VHF filtering (3)Low and high-pass filters are used to filter out frequency components that could possiblydegrade the performance of the NXAMP Powered TDcontroller and loudspeakers connected(depending on the cabinet setup chosen). The filters are optimised to work in conjunctionwith overall system response.PAGE 33 OF 103