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GEOSUB Subwoofer (with 6 Quick Release Pins, 6 T-RAP Lanyards)


Nexo's GEOSUB displays exceptional forward gain across three octaves eliminating many problems common to omni-directional LF.
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Nexo's GEOSUB displays exceptional forward gain across three octaves eliminating many problems common to omni-directional LF. A high-efficiency, frontloaded 18" driver delivers 140-143dB Peak SPL, while twin 12" side-firing transducers help create cardioid LF pattern control via precise rear pattern cancellation.

NX242 TDcontrollers, fitted with the required NXtension Expander Boards, employ advanced digital filter sets with new, proprietary algorithms, to optimize phase and extend GEOSUB's cardioid LF control from midbass to subbass.  The Over/Under GEOD-BUMPER allows as many as 16x GEOSUBs to be flown together and presents multiple stage-stackable options.


  • Advanced Cardioid Bass and SubBass module
  • Optimized Front-to-Rear Phase Adjustment and Maximized LF and SubBass Efficiency
  • Aerodynamic Profiled Vents with 20dB Vent Noise Reduction and improved Linearity at high SPL
  • X-Over Mode from 75Hz to 150Hz when GEO SUBs are stacked. Overlap Mode up to 600Hz when GEO SUBs are flown with any GEO system
  • Arrays with GEO D10 or flies independently as part of GEO S and GEO T Systems
  • EtherSound™ (Network) Controllable
  • Bottom-Line Engineering for Theatre to Arena-Sized Fixed & Mobile Applications

General Specifications:

  • Components:
    - 1x 18" (46 cm) long excursion neodymium 8 ohm driver
    - 2x 12" (30 cm) neodymium 16 ohm drivers
  • Dimensions:  21-1/4" H x 29-1/3" W x 44-1/2" D (552.5 x 744 x 1131 mm)
  • Shape: 10° Trapezoid
  • Weight: 189.6 lbs (86 kg)
  • Connectors: 2 x NL4MP SPEAKON 4 pole (In & Through).
  • Construction: Baltic Birch ply finish with structured black coating.
  • Front Finish: Moulded Black Metal Grill.
  • Flying Points: Integral flying system. Intercabinet angle adjustments = 0.2°, 0.315°, 0.5°, 0.8°;
    1.25°, 2.0°, 3.15°, 5, 6.3°, 8.0°, 10° (logarithmic steps).

System Specifications (with NX242 TDcontroller):

  • Frequency response: @-3dB* 38Hz – 300Hz
  • Usable range: @-6dB* 35Hz – 500Hz
    *Response curves and data: anechoic far field above 400Hz, half-space anechoic below 400Hz.  Usable range data: frequency response capability with TD crossover slopes removed.
  • Sensitivity 1W: @ 1m** 103dB SPL Nominal
  • Peak SPL: @ 1m** 140-143dB Peak
    **Sensitivity & peak SPL: will depend on spectral distribution. Measured with band limited pink noise.  Refers to the specified +/- 3dB range.  Data are for speaker + processor + recommended amplifier combinations.
  • Dispersion***: Cardioid pattern over the entire useable bandwidth (two channels of the NX242 are used for the process).
  • Directivity Index***: Q = 4.3 & DI = 5.3dB over the entire useable bandwidth.
    ***Directivity curves and data: 1/3 octave smoothed frequency response, normalized to on-axis response.  Data obtained by computer processing of off-axis response curves.
  • Crossover frequency: X-Over Mode = 75Hz active / Overlap Mode = 300Hz through NX242 Digital TDcontroller.
  • Nominal impedance: 2 x 8 ohms.
  • Recommended amplifiers: 2 amplifier channels are required for directional operation, each rated at 1000 to
    2000Watts into 8 ohms per channel.

System Operation:

  • Electronic Controller The NX242 Digital TDcontroller presets are precisely matched to the GEO SUB and include
    sophisticated protection systems. Using the GEO SUB without a properly connected
    NX242 Digital TDcontroller will result in poor sound quality and can damage components.
  • Speaker Cables The front loudspeaker of the GEO SUB is wired 2+ & 2- while the rear loudspeakers
    are wired in parallel 1- & 1+. The GEO SUB must use separate cables from the main system.
  • Rigging System: Please refer to the user manual before any operation.

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