Treated Paper Cones

It is widely recognized that cones made of paper represent an ideal marriage between lightness, stiffness and the ability of the cone to dampen any unwanted vibration (read: distortion). Our paper cone, widely known for its excellent sound attributes, is made waterproof thanks to a polymer developed exclusively by ESB. The treatment does not negatively impact the appearance or performance of the speaker like the shiny polymers used by other companies which add an appreciable amount of mass to the cone and significantly modify its sound quality.
Our treatment protects the cone from dripping water (like inside a door panel), as well as accidental splashes on the front of the cone.

Basket and Ventilation System

The basket, made from ABS and reinforced with fiberglass, has been engineered to obtain the maximum torsional rigidity (resistance to bending), but at the same time, offers minimum resistance to the passage of air displaced by the cone from the rear face. This is clearly visible from the numerous stiffeners and ribs. The basket plays a fundamental role in aligning the coil in the magnetic circuit; its rigidity is crucial. Of equal importance is the damping of this component. Often, metal baskets tend to resonate, and this significantly alters speaker’s sound quality. The material used, in addition to being less sensitive to thermal changes, is non-flammable and also non-resonant.
In addition, the ABS frame allows for a better clamping force torque than typical pressed steel frames and ensures that the voice coil remains well centered within the magnetic field

Suspension

High Damping Single Wave Perbunan® rubber: The Perbunan rubber surround is much more stable during temperature changes than standard rubber… its range of use extends from -20° F to + 100° F while maintaining its almost constant elasticity performance. Its profile ensures a dual function of high damping and great transversal stability. This means that the cone is limited to vertical movement only, eliminating the transversal movements that could cause contact with the voice coil and the magnet. As a result, these speakers can operate safely at high power and high excursions.

Centering

ESB's research department has spent a lot of time researching the ideal shape of the spider. This fundamental component must guarantee the perfect and linear travel of the cone at both low and high power, but must limit its excursion before becoming uncontrollable. The material is a special balanced cotton impregnated with phenolic resin that ensure a perfectly symmetrical excursion from the first mW of power, and then attenuates it when it reaches the value of Xmax. The design of this component ensures perfect ventilation of the voice coil, dissipating the heat from the lower part of the speaker, while at the same time, avoiding any counter-pressure from the cone’s movement.

The Magnetic Motor

The woofer voice coils use an aluminum support and a winding with a double layer of copper wire with an aluminum core. The long stroke design was chosen to improve sensitivity and efficiency while keeping distortion to a minimum. All the woofer are equipped a Y-35 grade ferrite magnet motor, a type of magnet with significantly higher performance than "standard" magnets. The motor’s metal parts use low carbon steel and have been designed to obtain the maximum magnetic saturation. This guarantees the best electroacoustic performance

3000 Series

ESB Audio - 3.9 3.5”/90 mm Cone Midrange

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