3" (77 mm) Square, 45 Ohm, Intercom Speaker

Brand Name
MISCO OEM
Part #
77SA45M-1
Built to Order
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THIS IS A “BUILT TO ORDER” PRODUCT

This all-weather speaker is ideal for applications both outside and inside. With its 45 ohm impedance, it is often used in entry intercoms and easily fits into small enclosures and tight spaces. Its alnico V, HE+ magnet helps deliver high levels of clear communication. Its mylar cone design helps prevent moisture absorption, especially useful in high humidity.

  • Alnico V Plus, High Energy Plus Magnet (HE+)
  • 1 watt, Program Power
  • Steel basket construction
  • High tensile strength polyester film (PET) cone & dust cap
  • Robust, copper-wound 0.6 inch voice coil

This speaker is not only ideal for intercom, it would be a great replacement speaker (standard hole placement) for radios, TVs, signaling, and alarm devices.

Download Product Specifications (PDF) »

More Information
Brand Name MISCO OEM
Speaker Type Voice
Shape of Speaker Square
Size, Nominal (inch & mm) 3" (77 mm)
Environment Outdoor / Indoor
Application Commercial, Indoor, Medical, Outdoor , Signal / Alarm Systems, Transit, Voice Communications
RoHS Compliant Yes
PRIMARY SPECIFICATIONS
Rated impedance (Ω) 45
Rated Power IEC268-5 (W) 1 Watt
Power, Program (W) 2
Sensitivity (dB SPL) ¹ 86
Frequency range (Hz) 250 - 12,000
SMALL SIGNAL PARAMETERS
DC resistance (Re) (Ω) 42.0
Resonant Frequency (Fs) (Hz) 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
MATERIAL DESCRIPTIONS
Basket type Zinc Plated Stamped Steel
Terminal size 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 (gm) 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