2.25" (57 mm) Peaked Response Alarm Speaker

Brand Name
MISCO OEM
Part #
57RFT-8A
Built to Order
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THIS IS A “BUILT TO ORDER” PRODUCT

This all-weather, high sensitivity (106 dB), speaker is designed for use in vehicle back-up alarms or industrial alarms. Its unique design creates a high-output resonant frequency, which allows it to meet many SAE alarm standards. Its phenolic impregnated cone design helps prevent moisture absorption, especially useful in high humidity.

  • Signal / Alarm Speaker
  • 2.25" (57 mm) basket diameter
  • 4 watts, 8 ohms, 106 dB SPL
  • 0.6" copper voice coil, Kapton former
  • Ferrite magnet, stamped steel basket
  • Phenolic treated cloth cone & surround

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More Information
Brand Name MISCO OEM
Height (Inch) 1.000000
Width (Inch) 2.250000
Length (Inch) 2.250000
Speaker Type Alarm
Shape of Speaker Round
Size, Nominal (inch & mm) 2.25" (57 mm)
Environment Outdoor
Application Medical, Military, Signal / Alarm Systems, Transit
RoHS Compliant Yes
Rated Impedance (Ω) 8
Rated Power IEC268-5 (W) 4 Watts
Program Power (W) 8
Sensitivity (dB SPL) ¹ 106
Frequency Range (Hz) 1250 - 13,000
DC Resistance (Re) (Ω) 6.8
Resonant Frequency (Fs) (Hz) 1300
Nominal Impedance (Z) (Ω) 8
Voice Coil Inductance (Le) (mH) 0
Mechanical Q Factor (Qms) 23.2
Electrical Q Factor (Qes) 16.3
Total Q Factor (Qts) 9.58
Basket Type Stamped steel with zinc plating
Terminal Size (mm) 2.79 x 0.5
Voice Coil Diameter (mm) 15.23
Voice Coil Wire Material Copper
Voice Coil Former Material Kapton
Magnet Material Ferrite
Magnet Weight (gm) 20
Cone Body Material Black phenolic treated cloth
Cone Surround Material Black phenolic treated cloth
Spider Material Conex
Dust Cap Material Mylar
Net Weight (kg) 0.08
Technical Notes

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