ESB 3.165

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. - ABS basket reinforced with fiberglass. The basket has been engineered to obtain the maximum in terms of torsional rigidity (resistance to bending), but at the same time, offers the minimum resistance to air passage. - Pressed paper cone with waterproof treatment. It is widely recognized that cones made of paper are the ideal marriage between lightness, stiffness and the ability of the cone to dampen any unwanted vibration (read: distortion). - High damping, single wave rubber surround. The Perbunan® rubber edge is much more stable with temperature changes than standard rubber. - The 25 mm voice coil uses an aluminum support with a double layer winding technology of copper wire with an aluminum core. - High grade ferrite magnet, a type of magnet with significantly higher performance than "standard" magnets. Specifications General Data Overall Dimensions: 165*71mm Nominal Power Handling (AES)*: 120W Transient Power*: 240W Sensitivity 1W/1m: 88.5dB SPL Frequency Response: 65 - 9000Hz Cone Material: Fiber Reinforced High Strength Paper Cone *Nominal and Transient Power @ High Pass 150Hz - 12db/Oct Electrical Data Nominal Impedance: 4 Ohm DC Resistance: 3.11 Ohm Voice Coil Inductance: 0.754 μH Voice Coil and Magnet Parameters Voice Coil Diameter: 25mm Voice Coil Height: 10.5mm Magnetic Gap Height: 4.0mm Max Linear Excursion: ±3.25mm Voice Coil Former: Aluminum Number of Layers: 2 Layers Magnet System: Ferrite Y-35 Efficiency: ηº 0.446% BL Product: 4.39 Na Magnet Dimension: 85*32*15mm T&S Parameters Suspension Compliance: 0.516 N/m Mechanical Q Factor: 3.026 Electrical Q Factor: 0.766 Total Q Factor: 0.611 Moving Mass: 11.63g Eq. Comp. Air Load: 13.93 l Resonance Frequency: 64.98Hz Effective Piston Area: 132.73 cm²