Coral 8F-60
Visaton TL8/C50F
They are very few eight-inch drivers single cone, that can cover almost the whole audible band. Coral 8F-60 is one of them. This driver is popular in Europe, because it was re-branded by Visaton with the name TL8/C50F
This driver has an unique coating of the cone and cloth surround. On right there is a photos of the back label of an unit, branded as Visaton.
The speaker is very well crafted. The magnet us huge with an underhung magnet system.
This is the the manufacturer's datasheet
This is the the datasheet from the German distributor
My Measurements
| Driver Properties | Thiele - Small Parameters | ||||
|---|---|---|---|---|---|
| Chassis material | Aluminum alloy Die Cast | Parameter | Measured | Datasheet | |
| Membrane material | Paper | Fs | 42.5 Hz | 45 Hz | |
| Magnet System | Ferrite | Re | 5.1 Ω | 5.3 Ω | |
| Surround | Cloth | Qms | 5.45 | 4.57 | |
| Voice Coil Diameter | 50 mm | Qes | 0.51 | 0.60 | |
| Nominal Impedance | 6 Ω | Qts | 0.47 | 0.53 | |
| Sensitivity | 93 dB/W/m | Vas | 46 ltr | 51 ltr | |
| Rated Power | 40W | Le | 0.16 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. It is notable, that the SPL graph above 600Hz has a minor increase with increasing the input power.
Burst decay response, measured at 1m on axis
The impedance curves BLACK - in a free air, BLUE - in 18 ltr sealed volume
Conclusion
There are two factory recommended designs for 8F-60 - the bassreflex and a back-loaded horn. The T/S parameters allow to be constructed an excellent TL construction as well.
Both recommended constructions in details:
Some words about the sound. I listened 8F-60 in a sealed enclosure.
The sound is solid, vigorous and melodic. The power capability is
impressive. The usage of a supertweeter is a subject of a personal
taste.
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