Nexo GEO S8 - Manual (Page 14)

P.14 DEPLOYING GEO TANGENT ARRAYS
D EPLOYING GEO T ANGENT A RRAYS
Vertical vs. Horizontal
One of the advantages of the GEO S8 Series is the ability to construct coherent vertical and horizontal arrays
from the appropriate GEO Tangent Array Modules. These two types of arrays are very different in their
behaviour and intended applications.
Vertical tangent arrays of GEO are intended for applications where the horizontal coverage (80 or 120º) is
suitable for the application and even SPL from the first row to the last row of the audience is desired. The NS-
1 software will help you design a vertical array of S805 and S830 cabinets and tailor the acoustic wave
generated by the cluster to fit your audience profile, providing equal power to equal areas. When done
properly, the GEO S8 Series can provide extremely even SPL throughout the depth of your audience,
including balcony coverage.
Horizontal tangent arrays of GEO S830 cabinets provide exceptional control of horizontal coverage but are
not intended to provide the same even SPL capability as a vertical array. Horizontal arrays deliver equal
power to equal angles, with SPL decreasing as you move further back in the audience. However, the GEO
S830 is designed to array tangentially with adjacent S830 cabinets providing a much more coherent wave
front from an array of multiple cabinets than conventional arrayable cabinets. This allows the user to provide
30º increments of horizontal coverage as needed.
CD12 HyperCardioid Subbass
The CD12 is a hypercardioid subbass device providing directional low frequency energy with a dramatic
reduction in low frequencies behind the loudspeaker(s). This is achieved using the interaction of two
independently driven 12” drivers, highly specialized ports, and the digital processing capabilities of the NX242
Loudspeaker Controller.
It is important to follow these guidelines to attain the best performance from the CD12;
• Keep at least 3’ to 4’ (1m) of space around the CD12(s) when they are located on the
ground. Objects or barriers within this space can interfere with the interaction of wave fronts
from the front and rear of the CD12.
• Drive the front and rear drivers with identical amplifier channels set to the same gain. The
operation of the CD12 is based on the assumption that both the front and rear sub-systems
are identical in terms of the amplifier’s electrical performance.
• When flying the CD12(s), use the linking bar to connect the CD12 bumper to the GEO
Bumper and keep at least 50cm (~20”) of space between the back of the GEO cabinets and
the front of the CD12(s).. It provides enough distance that the GEO cabinets will not
interfere with the acoustical wave front from the CD12. For time alignment with the main
system see page 13 “Delays & System Alignment”
• When ground stacking the CD12, it is better to stack them vertically than horizontally.
• When hanging or stacking multiple CD12 cabinets make sure they are all oriented correctly;
fronts forward and tops up. Do not hang one CD12 upside down relative to the others.