Version of the standard GEOS1210-ST certified as complying with the EN 54 standards for voice alarm systems. NEXO’s compact, 2-way GEO S1210-ST is a high-output, long throw version of the standard GEO S1210 cabinet, designed for stadium installations. While a narrow-Q (10°) device in single-source mode, S1210-ST’s unique Hyperboloid Reflective Wavesource (HRW) also allows coupled S1210-STs to radiate as coherent, wavefronts, in either horizontally or vertically arrayed systems. GEO S1210-ST’s coupled MF/HF pattern control is array-dependent, as designed by NS-1 array software, and configured according to venue -specific geometry. Non- coupled MF/HF coverage configures at 80°or 120°. The S1210-ST module displays exceptional MF-LF output (105dB SPL nominal sensitivity -1W @1m) from a single 12″ loudspeaker and NEXO’s proprietary Directivity Phase Device (DPD).

Key Features

  • Complies with EN 54 standards for voice alarm systems
  • High SPL for long-throw applications
  • Enhanced speech intelligibility
  • Coherent Wave Propagation from NEXO’s Advanced GEO Hyperbolic Wavesource
  • Advanced Constant Velocity Profile Output from 5.1° Wavefront Curvature
  • NS-1 Configurable, EtherSound™ (Network)


Frequency response [a] 53Hz – 19kHz ±3dB
Usable range @-6dB [a]50Hz – 20kHz
Sensitivity 1W @ 1m [b]105dB SPL nominal
Peak SPL @ 1m [b]Configuration Dependent [d]
Dispersion [c]Coupling Plane: Configuration dependent [d] Non-Coupling Plane: Configurable 80° / 120°
Crossover frequencyLF- HF: 1.1kHz Passive or Active (internally configurable)
Nominal impedance HF: 16Ω; LF: 16Ω
Recommended amplifiers
3x GEO S1210-ST in parallelHF: 875 to 1550W into 4Ω, LF: 1750 to 3100W into 4Ω
4x GEO S1210-ST in parallelHF: 1000 to 1800W into 4Ω, LF: 2000 to 3600W into 4Ω
6x GEO S1210-ST in parallel HF: 1650 to 3000W into 2Ω, LF: 3300 to 6000W into 2Ω


ComponentsHF: 1 x 3” voice coil, 1.4” throat 16Ω ND driver on a 5° hyperboloid reflective wavesource LF: 1 x 12” (30cm) high excursion neodymium 16Ω driver
Height x Width x Depth344 x 675 x 378 mm (13 1/2” x 26 1/2” x 14 7/8”) excluding accessories Rigging axis to axis height: 345mm (13 1/2”)
Shape10° Trapezoid
Weight net28.05kg (61.8 lbs) including array assembly system
Connectors2x NL4MP SPEAKON 4-pole (In & Through) behind IP cover
ConstructionBaltic Birch ply with structured black coating
Front finishMolded dark grey metal grille
Flying pointsTwo plates connecting with external accessories.Intercabinet angle adjustments = 0.2°, 0.315°, 0.5°, 0.8°; 1.25°, 2.0°, 3.15°, 5°, 6.3°, 8.0°, 10.0° (logarithmic steps)