Nexo GEO T - Manual (Page 64)

Page 64/67 R ECOMMENDED INSTALLATION TOOLS AND EQUIPMENT
10 R
ECOMMENDED 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. An ideal product
is the Calpac ‘Laser projecting a dot’ version which costs approximately €60.
• 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 95/98/2000 or XP with the current version
of NEXO GeoSoft installed. It is not possible to configure a Geo tangent array properly without
using GeoSoft. Note that, when GeoSoft 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.
• Digital remote inclinometer – with a remote sensor in the bumper and a meter unit at ground level
to ensure precise installation of the cluster. A typical unit for this purpose is the Schaevitz
Anglestar which typically costs around €350 for a sensor and meter unit pair. At greater cost but
with very high precision is the NEXO GeoSight system that predicts the stationary angle of the
array, even while it is swinging, and has a green laser mounted coincident to and parallel with the
axis of the topmost cabinet.
• Audio Analysis Software – recommended but not absolutely essential, programs such as SIA
Smaart Pro or Spectrafoo 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.