RCF Transducer

LOW FREQUENCY NEODYMIUM TRANSDUCERS
For decades RCF professional woofers have represented the ultimate performance, the highest power handling and the most advanced technology. Thanks to high energy magnetic designs, complex cooling systems and specifically developed new technologies, our neodymium transducers place themselves at the same, unsurpassed level.

INSIDE/OUTSIDE VOICE COILS
RCF has developed a unique voice coil, combining the advantages of inside/outside technology to the superior quality of polyimideimide materials (wire resins and formers resins). The inside/outside coil offers many advantages:
- the dissipation surface is doubled;
- the adhesion area to the Former is doubled;
- during thermal expansion the Former is squeezed between

inside and outside layers offering the best mechanical resistance. Our inside/outside formers are made from polyimide-imide fibreglass and the area between the coil and the cone is a triple layer of Nomex - fibreglass - Nomex for maximum stiffness and accurate sound transfer.

COMPLEX COOLING SYSTEMS
In our complex cooling designs individual components come together to create an ideal ventilation system. Commencing with the design of the basket, RCF has focused on providing finned cooling channels while optimising the surface area available to the front magnetic plate to dissipate heat efficiently. The dust cap and the sealed spiders function as an air pump expelling hot air and drawing in cool air every time the cone assembly moves. Many openings are situated directly on the transducer’s side and on the rear plate.

HIGH FREQUENCY NEODYMIUM TRANSDUCERS
The top of the former is bent and bonded directly to the edge of the titanium diaphragm resulting in a Direct Drive configuration. Direct Drive guarantees optimal transfer of energy between the voice coil and the dome assembly, providing smoother, extended frequency response beyond 10 KHz, reducing break up modes and lowering distortion. This assembly delivers high power handling along with excellent mechanical and thermal properties that make RCF neodymium compression drivers robust and reliable. Every detail is under our control, from titanium forming and voice coil winding to phase plugs machining and final assembly. Lightweight and powerful, our neodymium drivers are a reference in performance and reliability

DIRECT DRIVE VOICE COIL ASSEMBLIES
The top of the former is bent and bonded directly to the edge of the titanium diaphragm resulting in a Direct Drive configuration. Direct Drive guarantees optimal transfer of energy between the voice coil and the dome assembly,
providing smoother, extended frequency response beyond 10 KHz, reducing break up modes and lowering distortion. This assembly delivers high power handling along with excellent mechanical and thermal properties that make RCF neodymium compression drivers robust and reliable.

DIAPHRAGM ASSEMBLIES
Diaphragms and suspensions are precision formed from ultra thin pure titanium. Suspensions are based on an innovative design using progressive parabolic semi circles. The sections of the suspension offer a consistent suspension modulus with a variable, altering profile. This drastically reduces distortion eliminating resonance points and assists in controlling suspension break-up modes. The rear magnetic plate where the diaphragm assembly is located, possesses specially designed CNC machined ventilation slots that eliminate standing waves, turbulence and distortion created by the movement of the suspension. At the point where the titanium suspension is bonded to the assembly ring, a special dampening adhesive has been applied in order to further reduce and eliminate distortion creating resonances. The diaphragm assembly has been designed with easy field service in mind as it can be removed and replaced within minutes.

NEODYMIUM MAGNETIC CIRCUITS
Neodymium magnetic circuit designs provide even higher magnetic field strength in the voice coil gap than standard ceramic assemblies while dramatically lowering the overall weight of the device. Neodymium rare earth material also provides higher levels of force (BL) that increase control of the dome assembly's moving mass. This leads to higher efficiency, better transient response and diminishes high frequency distortion modes.

A thin copper ring is precision pressed on to the pole piece in order to modify and lower the inductance characteristics of the magnetic circuit and voice coil providing a controlled extension of the acoustic frequency response. RCF has provided cooling fins on the rear of the aluminum diaphragm assembly cover that creates a heat dissipating surface area for the driver's magnetic circuit. This assists in lowering circuit temperature, improving the driver's power compression characteristics and increasing output. Specific attention has been paid to magnetic circuit polarization for optimum thermal immunity.