Nexo GEO D - Manual (Page 72)

Page 72/97 S YSTEM ALIGNMENT GUIDELINES
7 S
YSTEM ALIGNMENT GUIDELINES
The NX242’s factory delay presets are optimised to provide the best possible crossover between the
GEO D and GEO SUB systems. The reference point for this adjustment is the front of each cabinet.
(This means that the internal delays needed to achieve a correct time alignment are set for cabinets
standing next to each other with both fronts aligned). We recommend that the system is adjusted so that
arrivals from GEO D and GEO SUB are coincident at a fairly distant listening position.
7.1 GEO SUB – GEO D Cluster design
Cluster design must be done with Geosoft2, which provides very intuitive and fast method to determine
all cluster geometry parameters in relation to venue where cluster is implemented.
IMPORTANT
Geosoft2 is a freeware downloadable on www.nexo-sa.com. Please check our website
periodically for upgrades.
Never install a GEO D / GEO SUB cluster without checking its acoustical performances
and mechanical safety in Geosoft2 prior to installation.
Please contact your local distributor for assistance and/or training on Geosoft2
7.2 Stacked GEO SUB’s and Flown GEO D’s
Recommended NX242 GEOD setup family: X-OVER
In the example below,
r
1
being the distance from GEO D array to listener position, and
r
2
being the
distance from GEO SUB to listener position, the distance difference is then
r
1
–
r
2
(specified meters or
feet).
• r
1
>
r
2
, the delay should be set on the GEO SUB NX242 TDcontroller.
• r
1
<
r
2
, the delay should be set on the GEO D NX242 TDcontroller
• To convert the result in time delay (specified in seconds), apply:
∆t = ( r
1
-
r
2
)/C
r
1
and
r
2
in meters, C (sound speed)
≈ 343 m/S.
The delay parameter is set in MENU 1.2 (set the units to meters, feet or seconds according to your
preference). Delay will have to be adjusted according to the distance difference
r
1
–
r
2
(see figure below).
r
1
r
2