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SoundTube SM400I
4" Coaxial Surface Mount Speaker


The SM400i is a 4" full-range surface-mount speaker.
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The SM400i is a 4" full-range surface-mount speaker. Included with every SM400i speaker is a fast-action, four-pin Euroblock connector that speeds up wiring, allows simplified daisy-chaining and provides the option for pre-wiring where 'division of labor' codes exist.


  • Vertical and horizontal pivoting offer precision aiming.
  • Tool-free Stealth™ u-bracket mounting system provides fast & secure installation included with each SM400i speaker.
  • BroadBeam® waveguide technology delivers a consistent dispersion pattern up to 10 kHz for maximum coverage area per speaker
  • Speed-tap power settings save customers time and money on ordering, inventory tracking, installation and system tuning.
  • High-frequency driver protection with automatic reset.
  • 25, 70.7 and 100 Volt transformer options with coice coil/8 Ohm direct.
  • Durable construction, powder-coated grille, Weatherized components and terminal weather boot allow for indoor or outdoor installations.
  • May be used in conjunction with RS1001i Subwoofer for applications requiring additional bass.
  • Optional port plugs provided for added weather resistance.


  • Frequency Response(-3 dB): 92 Hz - 22 kHz
  • Low Frequency(-10 dB): 73 Hz
  • Sensitivity: 88.3 dB
  • Power Capacity RMS: 20 W
  • Max SPL dB @ 1 M: 98 dB
  • Nominal Impedance: 4 Ohm
  • Transformer Options: 25 / 70.7 / 100 Volt with voice coil/8 Ohm direct.
  • Woofer: 4 in 1 x 102mm Poly
  • Tweeter: 1 in / 25 mm Convex Aluminum w/ BroadBeam® Waveguide
  • Connections: 5 mm, 4-pin Euroblock
  • Visible Height: 7.47 in / 189.7 mm (depth)
  • Visible Diameter: 7.7 in / 197 mm
  • Width: 6.97 in / 177 mm
  • Depth: 7.47 in / 190 mm
  • Weight: 1.8 kg / 3.9 lb
  • Colors: White / Black

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