Nexo Geo M6 Series, System Manual

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GEO M6 GENERAL SET-UP INSTRUCTIONS
System Manual GEOM6
Page 9 / 64
2.2 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 recommended 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 (

)
2 2.6 4 5.3 8 16
Cable section Recommended Cable Length
1,5 mm² (AWG #15) 3m/10ft 3m/13ft 6m/20ft 8m/26ft 12m/39ft 24m/79ft
2,5 mm² (AWG #13) 5m/16ft 7m/23ft 10m/33ft 13m/44ft 20m/66ft 40m/131ft
4 mm² (AWG #11) 8m/26ft 10m/33ft 16m/52ft 21m/70ft 32m/105ft 64m/210ft
6 mm
2
(AWG #9) 12m/40ft 16m/52ft 24m/79ft 32m/104ft 48m/160ft 96m/315ft
Maximum allowed length is 4 times recommended length.
Example:
GEO M6 module has a 8

nominal impedance. When connecting 4 modules in parallel, total load impedance become 2

.
Recommended length for 4mm2 / (AWG#10) is 8 m / 26 ft, maximum allowed length is 32 m / 105 ft.
IMPORTANT
Long speaker cables induce capacitive effects
– up to hundreds of pF depending on the quality of the
cable - with a low-pass effect on high frequencies. If long speaker cables must be used, ensure that they
do not remain coiled while in use.
2.3 GEO M620 and GEO M6B recommended amplification
NEXO TD Controllers Recommended amplification
DTD Cont DTDAMP4x1.3 (4x1.3 kW/4

)
2 x GEO M620 per channel
2 x GEO M6B per channel
NXAMP4x1mk2 Powered Controller 4 channels mode (4x1.3kW/2

)
3 x GEO M620 per channel
3 x GEO M6B per channel
NXAMP4x2mk2 Powered Controller 4 channels mode (4x2.5kW/2

)
4 x GEO M620 per channel
4 x GEO M6B per channel
2.4 GEO M6 setups on NEXO TD Controllers
Please consult nexo-sa.com for NEXO TD Controllers firmware information.