Version of the standard GEOS1230 certified as complying with the EN 54 standards for voice alarm systems. The compact, 2-way GEO S1230 is a scalable loudspeaker module that displays exceptional MF-LF output (103dB SPL nominal sensitivity -1W @1m) from a single12” loudspeaker and NEXO’s proprietary Directivity Phase Device (DPD). A narrow-Q (30°) device in single-source mode, S1230’s unique Hyperboloid Reflective Wavesource (HRW) allows coupled S1210/1230s to radiate as coherent, wavefronts, yeilding precise pattern control in vertical or horizontal arrays. S12 arrays display traditional “tight-pack” pattern control in the non-coupled plane.

Key Features

  • Complies with EN 54 standards for voice alarm systems
  • Coherent Wave Propagation from NEXO’s Advanced GEO Hyperbolic Wavesource
  • Advanced Constant Velocity Profile Output from 28.5° Wavefront Curvature
  • Integral Rigging System with Angles from 22.5° to 30°
  • NS-1 Configurable, EtherSoundTM (Network)


Frequency response [a]53Hz – 19kHz ±3dB
Usable range @-6dB [a]50Hz – 20kHz
Sensitivity103dB SPL nominal
Peak SPL @ 1m [b]131 to 133dB Peak (for 500 to 900 W RMS Amplifier)
Dispersion [c]Coupling Plane: 28.5° Non-Coupling Plane: Configurable 80° / 120°
Crossover frequencyLF- HF: 1.1kHz Passive or Active (internally configurable)
Nominal impedance16Ω
Recommended amplifiers
3x GEO S1210 in parallelHF: 875 to 1550W into 4Ω, LF: 1750 to 3100W into 4Ω
4x GEO S1210 in parallelHF: 1000 to 1800W into 4Ω, LF: 2000 to 3600W into 4Ω
6x GEO S1210 in parallelHF: 1650 to 3000W into 2Ω, LF: 3300 to 6000W into 2Ω


ComponentsHF: 1x 3” voice coil, 1.4” throat 16Ω driver on a 30° hyperboloid reflective wavesource
Height x Width x Depth344 x 674 x 400 mm (13 1/2” x 26 1/2” x 15 1/2”) excluding accessories Rigging axis to axis height: 345mm (13 1/2”)
Shape30° Trapezoid
Weight net26.8kg (59.1lbs) excluding accessories
Connectors2x NL4MP SPEAKON 4-pole (In & Through) behind IP cover
ConstructionBaltic Birch ply with structured black coating
Front finish Molded dark grey metal grille
Flying points Two plates connecting with external accessories Intercabinet angle adjustments = (16°) - 22.5° - 30°