Nexo GEO T - Manual (Page 44)

Page 44/67 NEXO NX242 D IGITAL C ONTROLLER FOR GEO T
5.3.3 CD18
Hardware configuration
• Input (L, R or L+R) can be selected in MENU 3.2
• Output 1 drives the rear-firing 18 inch transducer of the left CD18’s
• Output 2 drives the front-firing 18 inch transducer of the left CD18’s
• Output 3 drives the rear-firing 18 inch transducer of the right CD18 ‘s
• Output 4 drives the front-firing 18 inch transducer of the right CD18 ‘s
Setups
Please refer to the latest versions of the NX242 user manual and firmware (www.NEXO-sa.com).
5.4 Trouble shooting
The NX242 has been designed to be user-friendly. However with highly technical systems such as the
GEO T & CD18, incorrect adjustment of the NX242 can lower the quality & safety of your system. Listed
below are the most common errors encountered by NEXO Technical Support.
5.4.1 Operation of Multiple TDcontrollers
Typically, GEO T/CD18 systems require a minimum of two NX242’s per side (one NX242 for GEO T’s,
another for the CD18’s). Eventually, two or more NX242’s will operate within the same GEO T cluster. It
is mandatory to verify the consistency of the setups and adjustment between processors to avoid the
problems described below.
IMPORTANT
When using multiple NX242’s in a single array, all parameters should be identical and set
to proper values.
5.4.2 Amplifier Power (MENU 2.7)
If the amplifier power (MENU 2.7) is set to a value below the amplifer’s actual power, the peak limiter of
the NX242 will trigger continually, creating audible distortion. Please note that this peak limiter is not set
to act as a compressor on the signal. It is intended to minimize the clipping of the amplifier by operating
slightly after the amplifier’s clipping point.
One way to properly adjust this parameter is to set amplifier power at maximum (5000W) and decrease
the value until the amplifier and TDcontroller clip at the same time.
5.4.3 Amplifier Gain (MENU 2.6)
It is very important to check the gain of each channel. When all amplifier gain switches are set to
identical gain and LF rear and LF/MF front amplifier operate in bridge mono mode, you must remember
to add 6dB to the normal gain on the channels connected to mono bridged amplifiers. If this value is not
set properly the TDcontroller will not be able to protect your system properly. The second line of the
MENU2.6 displays the gain as seen by the NX242 to ease the setting of this parameter.
5.4.4 Gains
If your amplifier gains are not the same on each channel, you will have to adjust the inter-channel gain
in order to compensate for this amplifier gain difference.
5.4.5 Delays
Multiple NX242’s can be used on a single GEO T array. When changing the delay in one NX242
TDcontroller that is part of a multi-controller system, take great care to have exactly the same delay
setting in all NX242 TDcontrollers that receive the same input signal (i.e. all NX242’s that are fed from
the Left output of the mixing console should have the same delay settings). A Tangent Array is very
sensitive to delay differences between sections of the array in the same line. You could experience
coverage problems if all delays applied to a Tangent Array are not equal.