Owner's Manual

Page 12/112 GEO S12 GENERAL SET-UP INSTRUCTIONS
2 GEO S12 GENERAL SET-UP INSTRUCTIONS
2.1 Speaker connection
2.1.1 GEO S12 connectors
GEO S12 is connected with Speakon NL4FC plugs (not supplied). A wiring
diagram is printed on the connection panel located on the back of each
cabinet.The 4 pins of the 2 Speakon sockets identified in / out are connected in
parallel within the enclosure.
Either connector can be used to connect amplifier or to link to an additional Geo
S12 cabinet or to link to an optional Sub (if present). Therefore, a single 4-
conductor cable can connect two amplifier channels to various Geo S12 and/or
Sub Bass.
Connectors are wired as follows:
2.1.2 Configuring Geo S12 for Passive or Active Mode
• Remove the six TORX screws that hold the connector panel (figure next page);
• Remove the connector panel so that filter WAGO connectors become accessible;
• In Passive Mode, connector A (from filter) should be inserted in connector B (PCB “Passive In”),
and Connector D (“Passive Out”) should be connected to speakers via connector C.
• In Active Mode, WAGO Connector A (from filter) should be directly connected into to speakers via
connector C (PCB connectors B & D are then unused).
2.1.3 Cabling
NEXO recommends the exclusive use of multi-conductor cables to connect the system: the cable kit is
compatible with all the cabinets, and there is no possible confusion between LF, MF and HF sections.
Cable choice consists mainly of selecting cables of the correct sectional dimension (size) in relation to
the load resistance and the cable length. Too small a cable section will increase both its serial
resistance and its capacitance; this reduces the electrical power delivered to the loudspeaker and can
also induce response (damping factor) variations.
For a serial resistance less or equal to 4% of the load impedance (damping factor = 25), the maximum
cable length is given by:
L
max
= Z x S S in mm
2
, Z in Ohm, L
max
in meters
The table below indicates these values, for 3 common sizes.
Load Impedance (Ω)
2 3 4 6 8 12 16
Cable section Maximum Length (meters)
1,5 mm² (AWG #14) 3 4.5 6 9 12 18 24
2,5 mm² (AWG #12) 5 7.5 10 15 20 30 40
4 mm² (AWG #10) 8 12 16 24 32 48 64
Speakon
Connector
Passive
Mode
Active
Mode
1(-)
Ö
Not Connected Geo S12 LF (-)
1(+)
Ö
Not Connected Geo S12 LF (+)
2(-)
Ö
Geo S12 (-) Geo S12 HF (-)
2(+) Geo S12 (+) Geo S12 HF (+)