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Soundtube RS400i-BK Black 4" Coax Open Ceiling Speaker

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The RS400i is a 4-inch, two-way ported speaker with an open-ceiling enclosure design that delivers effective low-end response (76 Hz) and 125-degree off-axis performance (2 to 10 kHz, independently verified). SoundTubes proprietary BroadBeam(R) waveguide tweeter system delivers consistent high-performance audio across the operating bandwidth. The RS400i speaker design incorporates a low-profile grille and a five-position tap switch with transformer bypass position. Hanging hardware is included and features a SpeedClamp(tm) self-locking cable grip for fast, easy and secure installation.


  • Patented BroadBeam(R) waveguide technology delivers a consistent dispersion pattern for maximum intelligibility and edge-to-edge coverage (up to 10 kHz, independently verified).
  • One 4.0 inch (102 mm) polypropylene woofer and one 1.0 inch (25 mm) convex titanium tweeter with FerroFluid cooling.
  • Weatherized components for indoor and outdoor applications.
  • Includes UL listed hanging hardware with adjustable galvanized steel cables and integrated SpeedClamp(tm) self-locking cable grip for fast, easy and secure installation. Also includes Euroblock connector and terminal weather boot.
  • Patented ZeroReflection(tm) enclosure technology for optimal sound reproduction and cabinet rigidity.
  • Easy access five-position selectable tap switch for 25-, 70.7- and 100-volt applications with transformer bypass position simplifies ordering and inventory tracking.
  • Steel grille with protective powder-coated finish for lasting durability.
  • Average sensitivity of 82.5 dB offers high-output capabilities and reduced amplification costs.
  • UL 1480 (UEAY) approved.
  • High-quality black or white paint finish. Custom paint colors optional.
  • Optional accessory: AC-RS-SM5 bracket for surface-mount applications.


  • Frequency Response(-3 dB): 95 Hz - 20 kHz
  • Low Frequency(-10 dB): 76 Hz - 22 kHz
  • Sensitivity: 82.5 dB
  • Power Capacity RMS: 20 W
  • Max SPL dB @ 1 M: 95.5 dB
  • Nominal Impedance: 4 ohms
  • Tweeter: 1 in. BroadBeam(R)
  • Woofer: 4.0 in. Poly
  • Connections: Four-pin Euroblock
  • Height: 8.80 inches
  • Diameter: 7.70 inches
  • Weight: 5.0 lbs
  • Shipping Weight: 7.0 lbs
  • Colors: Black or White
  • This model is BLACK