Professional Audio Solutions Since 1949 4" (100 mm) Commercial Loudspeaker, 8 Watt Transformer
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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, #8-32Â
Oaktron by MISCO is a premium line of high performance, ready-to-ship transducers and drivers for a wide variety of applications including high fidelity, arcade, and casino games, automotive, aerospace and many more. From elegantly simple to highly specialized designs for unique and demanding applications, there is an Oaktron loudspeaker perfectly suited for your needs.
MISCO engineers use the world's most sophisticated loudspeaker measurement systems including the Klippel Analyzer to maximize and validate the speaker's design, as well as the Klippel QC module to ensure perfect unit to unit consistency and reliability.
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) Âą | 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 (g) | 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 |