Creating Professional Audio Solutions Since 1949 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
- Buy 5 - 79 $39.94
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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 |