4 Inch (100 mm) Voice Range Speaker w/ Aluminum Grill

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Experience the undeniable sound of reliability with the 90308, a 4-inch voice range speaker designed to perform in any outdoor environment. This reliable and rugged speaker is perfect for outdoor voice communications, signals, alarms, and transit audio systems. Its robust ferrite magnet and durable aluminum voice coil deliver crystal-clear audio. 

The 90308 is built to withstand the elements, thanks to its pre-mounted black powder-coated aluminum grill that protects it from moisture, heat, and wind. With its exceptional sound quality and durability, this speaker is perfect for any application where audio needs to cut through the noise and last.

  • Reliable and rugged speaker designed for outdoor use
  • Crystal clear audio with a robust ferrite magnet and durable aluminum voice coil
  • Pre-mounted black powder-coated aluminum grill protects against the elements
  • Perfect for outdoor voice communications, signals, alarms, and transit audio systems
  • Exceptional sound quality and durability

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 Round
Size, Nominal (inch & mm) 4" (100 mm)
Environment Outdoor
Application Outdoor , Transit, Voice Communications
RoHS Compliant No
Rated Impedance (Ω) 8
Rated Power IEC268-5 (W) 10 Watts
Program Power (W) 20
Sensitivity (dB SPL) ¹ 94
Frequency Range (Hz) 300 - 5000
DC Resistance (Re) (Ω) 6.4
Resonant Frequency (Fs) (Hz) +/- 15% 685
Nominal Impedance (Z) (Ω) 8
Mechanical Q Factor (Qms) 9.99
Electrical Q Factor (Qes) 5.96
Total Q Factor (Qts) 3.73
Basket Type Stamped steel
Terminal Size (mm) 4.8 x 0.5
Voice Coil Diameter (mm) 19
Voice Coil Wire Material Copper clad aluminum
Voice Coil Former Material Kapton
Magnet Material Ferrite
Magnet Weight (g) 136
Cone Body Material Acrylic treated textile
Cone Surround Material Acrylic treated textile
Dust Cap Material Acrylic treated textile
Net Weight (kg) 0.52
Technical Notes

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