Coral Beta 6
This is the smallest model of the Beta top product range of the brand Coral. It differs from another two models by missing the phase plug. Instead of it, Beta 6 has a dome of aluminum alloy, attached directly at the voice coil.
This is the manufacturer's brochure
My Measurements
| Driver Properties | Thiele - Small Parameters | ||||
|---|---|---|---|---|---|
| Chassis material | Die Cast Aluminum Alloy | Parameter | Measured | Datasheet | |
| Membrane material | Paper | Fs | 42 Hz | 40 Hz | |
| Magnet System | Ferrite | Re | 7.2 Ω | N/A | |
| Surround | Cloth | Qms | 3.54 | N/A | |
| Voice Coil Diameter | 25 mm | Qes | 0.38 | N/A | |
| Nominal Impedance | 8 Ω | Qts | 0.34 | 0.36 | |
| Sensitivity | 94 dB/W/m | Vas | 38 ltr | N/A ltr | |
| Rated Power | 30W | Le | 0.35 mH | N/A | |
Frequency response at 1m with 2.83 V input RED - on axis, BLUE - 15 º off axis, GREEN - 30 º off axis
The second, third and fourth harmonic curves measured at 2.83V input RMS.
Burst decay response, measured at 1m on axis
The impedance curve in 18 ltr sealed box
Conclusion
Coral Beta 6 is a typical driver for back-loaded horn applications. The sound is rich and fleet. An excellent performer for acoustic music.
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