ESB Audio 4000 Series - 3 way System with UMA / no crossover
 
4.165
6.5"/165 mm Mid-Woofer
- Ultra-low carbon alloy steel pole piece CNC-machined using magnet
analysis software (FEM), cold forged in one-piece creates a perfect geometry. This produces an extra magnet force concentration just in front of the voice coil, focusing the magnetic force where needed.
- The Y35 ferrite magnet motor is optimized with FEA simulation to ensure a perfectly symmetrical magnetic flux in both directions of cone’s run. Motor metal parts are CNC machined from solid, refined material for maximum magnetic flux linearity and minimum magnetic loss. This reduces distortion at high power levels.
- Die cast aluminum alloy basket frame. This design structure offers great rigidity and minimal resistance to airflow movement without altering sound quality. The casting of this aluminum basket follows strict procedures that ensure compliance with regulatory specifications and help maintain consistent casting quality.
- CNC-machined ultra-low carbon alloy steel pole plate. This type of
manufacturing process ensures perfect flatness so it sits perfectly flush over the magnet without reducing any crucial magnetic flux.
- The large aluminum copper-clad vented voice coil can handle very high power while reproducing music with extreme realism and high dynamics. The copper clad aluminum wire voice coil is very lightweight and with excellent heat dissipation/capacity.
- Long-fiber, unbleached pulp cone with a special external treatment that makes this material a perfect combination of lightness, rigidity, and internal damping.
- Surround suspension made of soft nitrile rubber, UV-resistant, and unaffected by temperature change so that the superior acoustic qualities of this speaker are preserved long-term. Special edge design ensures perfect and free forward and backward movement.
- Deluxe protective stainless-steel grille.
 
Technical Specifications
- Nominal Impedance: 4 Ohm
- Nominal Power Handling: 150 Watt
- Transient Power: 300 Watt
- Frequency Response: 50 Hz ~ 6 KHz
- Sensitivity: 92.5 dB 2.83v/1m
 
4.UMA
2-Way Mid-High Unit
- Silk dome (tweeter) with polymer laminated (Sonatex™) creates a perfect balance between weight, rigidity, and self-damping. The catenary curvature ensures wide dispersion of the tweeter.
- High-grade neodymium magnet. Not all magnets of equal size are equal in strength. This high grade (N52), high-energy magnet provides a high resistance to demagnetization and is over 25% stronger for the same mass than more common lower grade magnets.
- An acoustic resistance component inside of the ventilation hole helps to control and dampen dome movement resulting in reduced distortion and a linear impedance curve for improved speaker/amplifier coupling.
- Ultra-low carbon alloy steel pole piece CNC-machined magnet analysis software (FEM) to create a perfect geometry.
- Long-fiber, unbleached pulp cone (midrange) with a special external treatment that makes this material a perfect combination of lightness, rigidity, and internal damping. Discerning audiophiles consider pulp to be the best compromise for a speaker cone reproducing low and medium frequencies. The curvilinear-shaped cone improves this speaker’s performance through their unique geometry. The sensitive inner section at the cone features a severe angle design that aids in its performance. The outer edge is flat and more rigid, producing louder mid-bass frequencies that radiates uniformly throughout the listening environment.
- The voice coil is designed to be extremely lightweight in order to easily reach the highest frequencies, but at the same time, remain durable enough to handle great power. The copper clad aluminum wire voice coil is very lightweight and with excellent heat dissipation/capacity. Copper is coated over an aluminum surface providing equal copper surface area at a fraction of the weight of solid copper wire.
- Injected ABS twin frame. This custom configuration is what has made ESB famous in the automobile audiophile world: the UMA unit ("Unità Medio Alta" in Italian). The extremely close positioning of the midrange and tweeter emission centers make these two components virtually one, facilitating installation in cars where space is tight and the separate position of these drivers would create quite a few phase problems.
- Deluxe protective stainless-steel grille with perforations calibrated to function as an acoustic lens, guaranteeing the sound emission will be in the on-axis part of the speaker.
 
Technical Specifications
- Nominal Impedance: 4 Ohm
- Nominal Power Handling: 100 Watt
- Transient Power: 200 Watt
- Frequency Response: 140 Hz ~ 22 KHz
- Sensitivity: 90.6 (mid), 93.5 (tw) dB 2.83v/1m