Nexo LS18 - Manual (Page 69)

S YSTEM ALIGNMENT GUIDELINES Page 69/103
9 S
YSTEM ALIGNMENT GUIDELINES
The NX242’s factory delay presets are optimised to provide the best possible crossover between the
GEO S12 and CD18 / S2 / 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 S12 and CD18 / S2 / GEO SUB are coincident at a fairly distant
listening position.
9.1 GEO S12 Vertical Cluster design
Cluster design must be done with NS-1 (previously Geosoft2), which provides very intuitive and fast
method to determine all cluster geometry parameters in relation to venue where cluster is implemented.
NS-1 is a freeware available for all Nexo users. Please contact your local distributor for
licensing procedure.
IMPORTANT
Never install a GEO S12 cluster without checking its acoustical performances and
mechanical safety in NS-1 prior to installation.
Please contact your local distributor for assistance and/or training NS-1
9.2 Stacked LS18s and Flown GEO S12
Recommended NX242 GEOS12 setup family: X-OVER
In the example below,
r
1
being the distance from GEO S12 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 LS18 NXAMP TDcontroller channel.
 r
1
< r
2
, the delay should be set on the GEO S12 NXAMP TDcontroller channel
 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.
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
2
r
1