Nexo GEO S8 - Manual (Page 13)

NX242 DIGITAL TDCONTROLLER SETTINGS P.13
Delays & System Alignment
The NX242 internal time adjustments (factory presets) have been optimised to provide the best crossover
possible between the MAIN and SUB systems. The reference point for this adjustment is the front side of
each cabinet. (That means that the internal delays are set for a S8 cabinet standing close to the CD12, with
both front sides being aligned).
Should you rig your CD12 behind the S8, you will have to delay the MAIN system the according distance
D.
The delay parameter is set in MENU 1.2 (set the units to meters or feet according to your preference).
Should you leave your CD12 on the ground, you will have to adjust the delay on the CD12 (using MENU 1.2)
according to the path difference between the flown GEO and the ground stacked CD12. We recommend you
to adjust your system for the more distant listening point.
In the following case where
A is the average height, B the listening point and C the difference between front
sides of both systems
CD12 Delay = C B B A
± − + 2 2
(specify meters or feet)
If this formula gives a negative result the delay should be implemented on the MAIN channel.
A
B
+C -C
D
Initial Set-up Precautions
When running up a system that includes new cabinets for the first time, the power should be increased slowly
to approximately 50% and the system operated at this level for two hours. During the following two hours of
operation the power level should be limited to approximately 75%. This procedure allows the adhesives and
suspensions within the loudspeaker components to stabilise and will extend their working life.
In all cases, it is advisable to connect the loudspeakers only after all the other components have been wired
and are operating correctly. This is particularly important for the amplifiers and the TDcontroller. It is a good
practice to turn down all the amplifier gains before connecting the cabinets and then turn them up again
individually with a medium level music source fed into the system. The sense LEDs of the corresponding
TDcontroller channel should light up accordingly. This will help to locate cabling errors, particularly channel
line inversions, which would disable the TDcontroller protections and may invalidate the warranty.
IMPORTANT
If more than one amplifier is being driven from an output of the NX242 TDcontroller, only those amplifiers that
are not connected to sense inputs may be attenuated. If the sensed amplifier is attenuated and the slave
amplifiers are not, severe system damage will result!