Boston Acoustics

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2-way 3 1/2 “ in-ceiling speaker with square bezel and grille. Key features include:. ¾-inch tweeter. 3 ½-inch woofer. Easy install features for existing ceilings. Reduced bezel design for seamless integration with the ceiling

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The 2-way 3-1/2” HSi 435 in-ceiling speaker is sized and styled to match today’s square small lighting fixtures. Plus the HSi 430 features a dramatically reduced visible bezel and magnetic grilles. The new reduced bezel allows for a virtually invisible installation in the ceiling. The “metal can” backs make them ideal for ceiling installations, with a variety of easy install features for existing ceilings.

For flexibility in crafting rich, room-filling soundscapes, the HSi 435 in-ceiling speaker features an innovative switchable highpass filter, which removes bass frequencies below 180Hz. When using the speakers without the HSi S6W2, the highpass filter may be switched off for optimum performance. However, if the speaker is being used full-range in high sound level applications, the highpass filter helps protect the speaker. For use with a dedicated subwoofer in the installation, the highpass filter may be switched on for optimum performance.

  • ¾-inch tweeter
  • 3 ½-inch woofer
  • Easy install features for existing ceilings
  • Reduced bezel design for seamless integration with the ceiling
  • Magnetic grilles for easy installation
  • Paint-ready surface allows you to match your ceiling
  • Square grille and bezel
  • Optional NCBR3 new construction bracket available


Nominal Impedance
8 ohms
Crossover Frequency
180Hz (Subwoofer); 3,500Hz (woofer – tweeter)
Mounting Depth (from surface)
7 1/2" (190mm)
Bass Unit
3 1/2" (89mm)
Recommended Amplifier Power
10-100 watts
Frequency Response (±3dB)
100Hz-20kHz with Highpass Filter switched off; 180Hz-20kHz with Highpass Filter switched on
Sensitivity (1 watt (2.83v) at 1m)
3/4" (20mm) Dome
External Dimensions
5 1/2" (138mm) diameter
Mounting Hole Cutout
4 7/8" (124mm) diameter

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