Nexo GEO D - Manual (Page 71)

NEXO NX242 D IGITAL C ONTROLLER FOR GEO D AND GEO SUB Page 71/97
6.4.2 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.
6.4.3 Amplifier Gain (MENU 2.6)
It is very important to check the gain of each channel. These values should be set in agreement with
amplifier gain. The second line of the MENU2.6 displays the gain as seen by the NX242 to ease the
setting of this parameter.
6.4.4 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.
6.4.5 Delays
Multiple NX242’s can be used on a single GEO D 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.
Please refer to the chapter in the NX242 User Manual on setting delay for proper time alignment
between GEO D’s and GEO SUB’s.
6.4.6 Reversed Cardioid Pattern
Polarity checks are often performed while the system is being set up. Keep in mind that cardioid
speakers may also require a coverage test. If you invert two outputs of the NX242, you could have the
main lobe inverted and firing to the rear. It may be quite hard to detect a reversed cardioid pattern when
it involves one section of a large array.
A good practice is to test the each cabinet in the array with the front speakers only. The system is then
omni-directional. Then turn on the back speaker: you should notice a massive reduction at the back,
and additional level at the front.
This test must be done in addition to the usual polarity test.
6.4.7 Using the wrong NX242 setups for a given cabinet
Each NX242 setup is tailored for a certain NEXO loudspeaker. Using the wrong setup will create safety
and quality problems. Always check that every cabinet in your system is being driven by the correct
NX242 setup.
6.4.8 Connections
To ensure correct electronic behaviour, and to guarantee specifications and EMC performance, a
NX242 must be properly wired. Always use balanced connectors with the shield connected to pin 1 on
both sides. For more wiring recommendations please refer to the application note in the NX242 manual
update.