Field Coil Speaker units
The breaking news, definitely important in our small Audio world, is that we are going to build a range of FIELD COIL loudspeakers.
We need custom loudspeakers to carry out our most ambitious projects, but they will also be made available for sale, aimed at all those enthusiasts that will want to buy these compromise-free transducers, built and designed with care from the heart.
They won’t be the ‘usual field-coils’, though…
Our devices will have exceptional characteristics which at the moment are a prerogative only of the Japanese semi-artisan companies. It is a long process but within a couple of years we think we can offer the complete range of Clinamen Field Coil loudspeakers, which will consist of 5 models:
- 8” FHL (front horn loading)
- 8” FHL motor for Lowther driver
- 12” direct radiation full range
- 15” woofer Qts 0.25-->1
- 18” woofer Qts 0.5--> per dipole
The design uses software for the finished elements, to evaluate the magnetic flow along the circuit and for the prediction of the Bn normal magnetic induction vector which hits the voice coil in the magnetic gap. Through this software we are also able to evaluate preliminarily the BxL force factor, and the inductance of the mobile coil according to the frequency and its position.
An example of preliminary studies of the motor for 8” FHL follows. It is to be noted that the iron is saturated next to the magnetic gap. This limits the modulation that the Back EMF - produced by the circulating current in the voice coil – implements on the induction field B, making it more stable and thus producing fewer distortions.
Their unique characteristics will be, for all models:
- Pure iron magnetic circuit (loudspeaker sold with a certificate of compliance of the iron), which allows to convey a much higher magnetic flow than that of the extra-soft metals usually used by our competitors (pure iron saturates at 2.15 Tesla; extra soft metals with 0.1% C saturates at only 1.85 Tesla)
- Magnetic circuit made ‘from a block’. It is a very expensive solution, because it involves a great waste of material but it allows the elimination of all the magnetic gaps among the various elements (there will only be one left, between the upper polar plate and the body of the motor; in a classic motor there are usually three couplings/magnetic gaps).
- FLUX STABILIZER’ copper ring for the stabilization of the induction field, through a short circuit of the counter-electromotive force.
- High tension and low current Field coil, like the old Masters used to do during the golden age of valves. As far as we know, only the artisan Oleg Rullit uses high tension coils. The advantages are numerous. The possibility to convey a low current means fewer losses in the distribution circuit and fewer irradiated disturbances both along the line and in the power supply. Furthermore there is the possibility to build a top of the range power supply for the coil; we think this is not possible with a high current/low tension coil. In our power supplies we can afford the luxury not to stabilize the tension, with the consequent advantages on the sound. On the other hand by feeding at low tension the variation of the power supply tension is proportionally much bigger; this results in an audible change of the parameters of the loudspeakers. Again, we can implement a power supply with polypropylene filter coils and condensers, as well as an AC/DC rectification with vacuum/gas tubes.
- Field coil wound up on a reel made from a block of Derlin makes for the highest electrical safety and geometrical stability of the reeling.
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