3 Inch (77 mm) Waterproof Intercom Speaker, 45 Ohm

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Experience uninterrupted communication with the 77SA45M-1 Waterproof Intercom Speaker, designed to excel in any weather. This 3-inch speaker features a 45-ohm impedance, perfect for entry intercoms and tight spaces. With a neodymium magnet and mylar cone that resists moisture absorption, this speaker delivers clear and crisp sound quality when needed. It's also made with high tensile strength and an enduring PET cone, ensuring durability and longevity, even in the most demanding indoor and outdoor environments. 

  • Neodymium magnet for superior sound quality
  • Mylar cone resists moisture absorption
  • High tensile strength and enduring PET cone for durability
  • Perfect for entry intercoms and small spaces
  • Ideal replacement for radios, TVs, and alarm systems.

MISCO engineers use the world's most sophisticated loudspeaker measurement systems, including the Klippel Analyzer, to maximize and confirm the speaker's design and the Klippel QC module to ensure perfect unit-to-unit consistency and reliability. 

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More Information
Brand Name MISCO OEM
Speaker Type Voice
Shape of Speaker Square
Size, Nominal (inch & mm) 3" (77 mm)
Environment Outdoor / Indoor
Application Indoor, Medical, Outdoor , Voice Communications
RoHS Compliant Yes
Rated Impedance (Ω) 45
Rated Power IEC268-5 (W) 1 Watt
Program Power (W) 2
Sensitivity (dB SPL) ¹ 86
Frequency Range (Hz) 250 - 12,000
DC Resistance (Re) (Ω) 42.0
Resonant Frequency (Fs) (Hz) +/- 15% 300
Nominal Impedance (Z) (Ω) 45
Voice Coil Inductance (Le) (mH) 0
Mechanical Q Factor (Qms) 14.1
Electrical Q Factor (Qes) 13.4
Total Q Factor (Qts) 6.86
Basket Type Zinc Plated Stamped Steel
Terminal Size (mm) 5.2 x 0.5 (0.205" x 0.02")
Voice Coil Diameter (mm) 15.2 (0.6")
Voice Coil Wire Material Copper
Voice Coil Former Material Engineered paper
Magnet Material Neodymium
Magnet Weight (g) 10 (0.40 ounces)
Cone Body Material Polyester (PET)
Cone Surround Material Polyester (PET)
Spider Material Cloth
Dust Cap Material Polyester (PET)
Net Weight (kg) 0.050
Technical Notes

¹ Sensitivity is measured with 2.83 volt input, measured on-axis at 1 meter distance