4" (100 mm) Commercial Loudspeaker, 8 Watt Transformer
Brand Name
Oaktron by MISCO
Model #
OK4-T78
Part #
93129
In stock
$44.94
- MSRP$67.99
- Buy 1 - 4$44.94
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The OK4-T78 is a high compliance 4” driver resistant to corrosion and moisture, attached to a 8 watt, 70 volt transformer. This compact driver is ideal for low-level distribution and paging systems looking for superior sound dispersion. A rugged steel frame and a treated cloth cone create reliable sound while remaining environmentally resistance.
- Full range speaker
- 4" (102 mm) steel basket diameter
- 15 watts, 8 ohms, 93 dB SPL
- 8 watt, 70 volt line matching transformer
- Ferrite magnet, treated cloth cone
- 3 Drill Tapped Holes, #8-32
Download Product Specifications (PDF) »
Brand Name | Oaktron by MISCO |
---|---|
Model # | OK4-T78 |
Size, Nominal (inch & mm) | 4" (100 mm) |
Shape of Speaker | Round |
Speaker Type | Wide Range |
Application | Commercial, Indoor, Voice Communications |
Environment | Indoor |
RoHS Compliant | No |
Nominal Impedance (Z) (Ω) | 8 |
Rated Power IEC268-5 (W) | 15 Watts |
Rated Impedance (Ω) | 8 |
Continuous Power (W) | 15 |
Program Power (W) | 30 |
Frequency Range (Hz) | 60 - 20,000 |
Sensitivity (dB SPL) ¹ | 93 |
Resonant Frequency (Fs) (Hz) | 129 |
DC Resistance (Re) (Ω) | 7.1 |
Voice Coil Inductance (Le) (mH) | 0.2 |
Mechanical Q Factor (Qms) | 5.52 |
Electrical Q Factor (Qes) | 0.72 |
Total Q Factor (Qts) | 0.64 |
Mechanical Resistance (Rms) (kg/s) | 0.5 |
Compliance Equivalent Volume (Vas) (L) | 2.14 |
Suspension Compliance (Cms) (mm/N) | 0.45 |
Surface Area of Diaphragm (Sd) (cm²) | 58.1 |
Moving Mass (Mms) (gm) | 3.4 |
Motor Force Factor (BL) (T•M) | 5.2 |
Efficiency (η₀) (%) | 0.61 |
Efficiency Bandwidth Product (EBP) (Fs/Qes) | 178.17 |
Basket Type | Stamped steel |
Terminal Size (mm) | 4.8 |
Voice Coil Diameter (mm) | 25.4 |
Voice Coil Wire Material | Copper |
Voice Coil Former Material | Kraft paper |
Voice Coil Winding | Single Layer |
Magnet Material | Ferrite |
Magnet Weight (gm) | 283.5 |
Cone Body Material | Treated cloth |
Dust Cap Material | Paper |
Spider Material | Cotton |
Net Weight (kg) | 0.99 |
Technical Notes | ¹ Sensitivity is measured with 2.83 volt input, measured on-axis at 1 meter distance |