ESB 4000 Series 4.165 6.5″/165mm Mid-Woofer

ESB Audio 4000 Series Speakers
The latest model series 4000 (Quattromila), born in 2024, benefits from extensive technical research, which has enabled the use of new materials, previously reserved only for much more expensive speakers. This was also achieved thanks to the parallel development with the top model series 9000 (Novemila), with which the Quattromila series shares several common elements. The main goal of ESB engineers was to achieve a much cheaper product, while maintaining high-quality sound and exclusive design. It is the design that attracts attention at first glance, led by the luxurious grilles of all speakers in a matte black finish, which expresses the aesthetic similarity with the top model series. In all speakers of the Quattromila series, you will also notice powerful neodymium magnets, which guarantee above-standard efficiency and the ability to achieve high sound pressure levels even when using low-power amplifiers. Other noble materials used, such as aluminum or steel, also command respect, but the main advantage of the Quattromila speakers is primarily the sound. This can be defined as “classical”, in other words, genre-neutral and without sound coloration. This fundamentally differs from the higher 5000 series, which is almost competitive in price and whose sound is, on the contrary, more suitable for so-called “light music” (often referred to as music that is easy to listen to), but also jazz or rock. Emphasis was also placed on easy installation in today’s modern vehicles – all speakers have high sensitivity, are also designed for off-axis sound reproduction and, for example, for tweeters, you can choose between three design installation options. The 4000 series includes a total of five individual components for variable assembly of two-way and three-way systems, which, thanks to their sound quality, will impress even the most demanding listeners.

ESB 4.165 mid-bass speakers
The Quattromila series mid-bass speakers immediately impress with their robust design, which hints at the power potential of these speakers. They are dominated by a high-quality magnet (Y-35) of oversized dimensions, which guarantees excess energy and easily reproducible excursion peaks, during which the coil operates very quietly in the magnetic field. The pole plate made of extremely low-carbon steel is cold-forged from a single piece and CNC-machined using FEM technology, achieving perfect geometry. This creates an additional concentration of magnetic force just in front of the voice coil, which focuses the magnetic force where it is needed. This type of manufacturing process ensures perfect flatness, so that the plate sits flush with the magnet without reducing the crucial magnetic flux. The speaker basket is made of die-cast aluminum alloy. This construction offers perfect rigidity and minimal resistance to airflow without changing the sound quality. The casting of this aluminum basket is carried out according to strict procedures that ensure compliance with regulatory specifications and help maintain consistent casting quality. The robust aluminum voice coil with copper jacket can handle very high power while reproducing music with extreme realism and high dynamics. The voice coil made of copper-clad aluminum wire is very light and has excellent heat dissipation. The long-fiber pulp membrane with a special external treatment is the perfect combination of lightness, rigidity and internal damping. The soft nitrile rubber surround is UV-resistant and unaffected by temperature changes, which ensures the excellent acoustic properties of this speaker are maintained over time. The special edge design ensures perfect and free forward and backward movement. Optional steel speaker grilles with a matte black finish are also available.