Nexo GEO D - Manual (Page 13)

GEO D G ENERAL S ET - UP I NSTRUCTIONS Page 13/97
2.2.1 GEO D10 recommended amplification
GEO D10 is rated for very high power handling and has a 16 Ohms nominal impedance per channel
(Passive 2 ways or Active 3 ways).
These high impedance values allow connection of 3 to 6 cabinets in parallel for each amplifier channel.
Nexo recommends amplifiers in agreement with table below:
Recommended
Amplifier# Channel 1
LF Rear
Channel 2
LF/MF Front + HF in Passive Mode
Channel 3
HF in Active Mode
GEO D10 Passive Mode
3 in parallel (5.3 Ohms load) 1750 to 3100 W / 4 Ohms 1750 to 3100 W / 4 Ohms
GEO D10 Active Mode
3 in parallel (5.3 Ohms load) 1750 to 3100 W / 4 Ohms 1750 to 3100 W / 4 Ohms 875to 1550 W / 4 Ohms
GEO D10 Passive Mode
4 in parallel (4 Ohms load) 2000 to 3600 W / 4 Ohms 2000 W to 3600 W / 4 Ohms -
GEO D10 Active Mode
4 in parallel (4 Ohms load) 2000 to 3600 W / 4 Ohms 2000 to 3600 W / 4 Ohms 1000 to 1800 W / 4 Ohms
GEO D10 Passive Mode
6 in parallel (2.7 Ohms load) 3300 to 6000 W / 2 Ohms 3300 to 6000 W / 2 Ohms
GEO D10 Active Mode
6 in parallel (2.7 Ohms load) 3300 to 6000 W / 2 Ohms 3300 to 6000 W / 2 Ohms 1650 to 3000 W / 2 Ohms
2.2.2 GEO SUB recommended amplification
The GEO SUB requires two amplifier channels delivering separately processed signals to produce its
directional pattern.
Recommended
Amplifier# Channel 1
VLF Rear
Channel 2
VLF-LF Front
GEO SUB
Single (8 Ohms load) 1000 to 2000 W / 8 Ohms 1000 to 2000 W / 8 Ohms
GEO SUB
2 in parallel (4 Ohms load) 2000 to 4000 W / 4 Ohms 2000 to 4000 W / 4 Ohms
2.2.3 Current rating
It is very important that the amplifier behaves correctly under low load conditions. A speaker system is
reactive by nature: on transient signals like music it will require four to ten times more instantaneous
current than its nominal impedance would indicate. Amplifiers are generally specified by continuous
RMS power into resistive loads, however the only useful information about current capacity is the
specification into a 2 Ohm load. It is possible to perform an amplifier listening test by loading the amps
with twice the number of cabinets considered for the application (2 speakers per channel instead of one,
4 instead of 2) and running the amps up to the onset of clipping. If the signal does not noticeably
deteriorate, the amplifier is well adapted (overheating after approximately ten minutes is normal but
thermal protection must not operate too quickly after starting this test).