Nexo NXAMP4X1, User Manual

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BLOCK DIAGRAM DESCRIPTION
Patching and routing (1)
Basically, any combination of the four XLR analog inputs (numbered A to D on the back
panel) can be patched to each channel of the amplifier. If an expansion board is fitted, the
four 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 we
recommend 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 to
the amplifier instantaneously for example if the digital input goes down).
Delay & polarity inversion (2)
Factory set-up delay
Note 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 set-
ups and are necessary to time-align the corresponding cabinet that is selected.
User set-up delay
The user can adjust the delay for each channel (see further about the delay menu, or delay
setting 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 and
factory set-up delay.
The NXAMP TDcontroller will limit the delay adjustment to a group of channel in specific
case such as:
• Active setups where two different channels are in the same physical cabinet: it is
then impossible to delay one channel without the other one (for example PS15 Active
setup, delay is linked between HF and LF).
• Cardioids setups will also prevent to adjust the delay on one channel only (for
example CD18 setup, delay is linked between front and rear loudspeaker).
• In the particular case of the RS subs in Omni, the two channels of amplifiers
dedicated to RS output are linked also together to prevent setups errors when
cabling directly RS in Omni mode to amplifier outputs.
Equalisation & Filtering
Subsonic and VHF filtering (3)
Low and high-pass filters are used to filter out frequency components that could possibly
degrade the performance of the NXAMP Powered TDcontroller and loudspeakers connected
(depending on the cabinet setup chosen). The filters are optimised to work in conjunction
with overall system response.
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