Nexo GEO S12 EN54 Series, System Manual

Page: 32 / 53

SYSTEM CHECK GUIDELINES
Page 32 / 53
System Manual GEOS12 EN54
8 SYSTEM CHECK GUIDELINES
8.1 Recommended installation tools and equipment
Tape measure
– should be 30m/100ft in length and be of durable fibre material. Have one per array available to speed up the
installation process.
Laser Inclinometer
– For measuring vertical and horizontal angles in the venue.
Spirit level
– used to ascertain the trueness of the surface from which the angle measurements originate.
Rangefinder measuring device
– either a Disto type laser measure or an optical laser rangefinder can be used. Devices such
as the Bushnell ‘Yardage Pro’ sports rangefinders provide sufficiently accuracy and are easy to use. They have the additional
advantage of working very well in bright sunlight.
Electronic calculator with trigonometric functions to calculate the height from ground level to points in the room. The formula to
calculate height of a point from measured angle and distance is:
Height of point = Sin (vertical angle in degrees) x distance to point
NB: Take care when using spreadsheets as they calculate using radians by default. To convert degrees to radians, use the
formula:
Angle (in radians) =3.142 x Angle (in degrees)/180
Computer
– Laptop or Desktop PC running Windows 8 with the current version of NEXO NS-1 installed. It is not possible to
configure a GEO tangent array properly without using NS-1. Note that, when NS-1 designs are prepared prior to arrival at the
venue, it is often necessary to modify or update the design to accommodate special circumstances. A PC is absolutely essential
to make such changes.
Audio Analysis Software
– recommended but not absolutely essential, programs such as Systune
TM
, Smaart
TM
enable rapid and
detailed analysis of the installation. Consider taking a training course in using one of these tools if you are not already competent
with them
– it will pay dividends in increased performance of the system.
8.2 GEO S12 EN54 System Check List
It is essential to execute all these check steps prior to perform a sound check on the “front end” to the system. Following this
checklist step by step will prevent many troubles and will save time in the end.
Are the speakers properly connected and angled?
Attach the first series of modules to the bumper.
Before flying, verify that all channels of all modules are functioning properly.
To check that all elements have the proper amplitude and phase, you should listen to the upper boxes at a close distance (<1
meter). You should be able to move from the top to the bottom of the cluster without hearing any change in the tonal balance.
Verify that the angle settings are the same on both sides of each module.
Raise the bumper, attach the next series of modules and repeat the above checks.
Make sure that these series of modules sum properly with the modules above them.
When all the modules are flown, check that the aiming angles are the same left and right.
Make sure that multiple GEO S12 EN54 are summing properly: 6 dB gain per doubling of quantity.
Final Pre-Sound Check Check
Play a CD track mono left, and then right: both sides must sound strictly identical. When listening in the centre between Left and
Right GEO S12s EN54
, everything from LF to HF should be located to the “phantom centre” position. If not, repeat the above
check sequence to identify the source of the problem.