2.25" (57 mm) Peaked Response Alarm Speaker

Brand Name
MISCO OEM
Part #
57RFT-8A
Out of stock
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  • MSRP$8.03
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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.

  • 8 Watts, program power
  • Black phenolic impregnated cone
  • Mylar dust cap
  • High Energy (HE) ferrite magnet
  • Steel basket structure
  • Pre-treated black cloth surround

Download Product Specifications (PDF) »

More Information
Brand Name MISCO OEM
Speaker Type Alarm
Shape of Speaker Round
Size, Nominal (inch & mm) 2.25" (57mm)
Environment Outdoor
Application Medical, Military, Signal / Alarm Systems, Transit
RoHS Compliant Yes
PRIMARY SPECIFICATIONS
Rated impedance (Ω) 8
Rated Power IEC268-5 (W) 4 Watts
Power, Program (W) 8
Sensitivity (dB SPL) ¹ 106
Frequency range (Hz) 1250 - 13,000
SMALL SIGNAL PARAMETERS
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
MATERIAL DESCRIPTIONS
Basket type Stamped Steel with zinc plating
Terminal size 2.79mm x 0.5mm (0.110" x 0.020")
Voice coil diameter (mm) 15.23mm (0.6")
Voice coil wire material Copper
Voice coil former material Kapton
Magnet Material Ferrite
Magnet weight (gm) 20 (0.170 ounces)
Cone body material black phenolic treated cloth
Cone surround material black phenolic treated cloth
Spider Material Conex
Dust cap material Mylar
Net weight (kg) 0.080
Technical Notes

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