5.6K3U
3-Way Speaker System with UMA
 
5.UMA
2-Way Mid-High Unit
- This special and exclusive component driver is a concept conceived way back in 1970’s. Its aim is to concentrate medium and tweeter emissions in a single virtual point. This minimizes phase delays and irregularities at the crossover point.
- All the parts that make up this component were made with the CNC process. This is very expensive and requires a lengthy manufacturing process, but ensures perfect geometry and impeccable aesthetics. Moreover, the parts are made with Avional aluminum with deep oxidization.
- Both components use a very large neodymium motor magnet optimized with computer simulations (FEA) to obtain a great efficiency and improved linearity all along the voice coil’s excursion. The neodymium magnet is of a high grade to eliminate magnetic losses at elevated temperatures and to concentrate more force in less space.
- The tweeter dome, made of high module carbon fiber with integrated soft cloth suspension, offers superb heat resistance, low weight and excellent self-damping, with a natural and linear response and a very low frequency extension.
- The midrange, also manufactured in carbon fiber, integrates a suspension in synthetic foam, ensuring a perfect balance between rigidity weight and self-damping. The carbon fiber guarantees an extremely natural and linear reproduction with an excellent extension at the ends of the band.
- Great attention was given to the ventilation of the two components, through multiple axial holes. Residual resonances are neutralized by the under dome dB Cloth® damping material. This extends the frequency response to the lower limits and reduces harmonic distortion. To improve control and damping an acoustic resistance was adopted on both components.
- Combined together, the two components are able to reproduce with perfect linearity the entire spectrum from 500Hz to 25KHz.
- Small permanent magnets fix the tweeter and midrange grill in the correct position and these are easy to remove for customization.
 
Technical Specifications
- Nominal Impedance: 4 Ohm
- Nominal Power Handling: 110 Watt
- Transient Power: 220 Watt
- Frequency Response: 500 Hz ~ 25 KHz
- Sensitivity: 94 dB 2.83v/1m
 
5.165
6.5"/165 mm Mid-Woofer
 
- The magnet motor is optimized with FEA simulation to ensure a perfectly symmetrical magnetic flux in both directions of movement of the cone.
- Great attention was paid to the axial and radial ventilation of the moving coil to ensure high power handling, reduced distortion, and increased durability. The stepped back allows a very long cone excursion.
- Metal parts from solid and refined material are CNC machined for maximum magnetic flux linearity and minimum magnetic loss. This reduces distortion at high power levels.
- A pure copper ring is inserted into the magnetic field to reduce harmonic distortion.
- A 25 mm CCAW (Copper Clad Aluminum Wire) double layer voice coil is wound on an aluminum former for exceptional power handling and compression-free reproduction to handle the most demanding musical passages.
- The carbon fiber reinforced, polymer matrix composite, exponential cone ensures an extraordinary rigidity combined with very low weight.
- The eight twin-spoke anti-resonant and self-extinguishing carbon fiber reinforced ABS frame ensures a drastic reduction of the cone's back reflections. This frame design assures high structural and torsional rigidity. This is necessary for perfect parts alignment and very tight construction tolerances.
- The exclusive ESB designed TSW (Twin Symmetrical Wave) double-wave rubber suspension allows an excursion with perfect progression and linearity. This feature ensures natural low-frequency reproduction at low as well as at high volume.
- The large Conex® spider allows a smooth and gentle run at low excursions, and gently holds the cone at high excursions, thus increasing the useful frequency range.
 
Technical Specifications
- Nominal Impedance: 3 Ohm
- Nominal Power: 160 Watt
- Transient Power: 320 Watt
- Frequency Response: 50 Hz ~ 3.5 KHz
- Sensitivity: 95 dB 2.83v/1m
 
5.6K3 CX
3-Way Passive Crossover
Passive crossovers are used in 2-way and 3-way speaker systems to electrically channel low tones to the bass loudspeaker, and high notes and overtones to the high frequency speakers. If a passive crossover has to fulfill its function without compromise, it must be able to handle extreme variations in dynamics, the full range of audio frequencies, complex transients, and the varying impedance of a loudspeaker load. ESB passive crossovers are carefully designed to complement the exact characteristics of ESB speakers. Each crossover network circuit controls the signal to the high and low frequency speakers so that smooth acoustic response is maintained through the full audio spectrum. Naturally, such sophisticated engineering demands very close tolerances in production. Ordinary crossovers, for example, often use electrolytic capacitors with tolerances of +/- 20% and metal core inductors. Response through these crossover regions is ragged and characteristics vary from unit to unit. All ESB networks, on the other hand, use only non-inductive polypropylene or mylar dielectric capacitors (not electrolytic units) individually tested to meet ESB’s stringent tolerances. The special inductors used in ESB networks have extremely low insertion loss so that none of the driving power to the speaker system is wasted in the network. To avoid interference between the inductors, they have been installed with a rotation of 90°. This arrangement cancels the interactions. All the resistors used to align the level of the various speakers with each other are of the non-inductive type and their power is greatly over-sized. A switch located on the output side allows the user to adjust the tweeter level on two options according to the distance of the tweeter from the listener (and for the midrange in the 5.6K3 CX). Both the input and output connections are robust, two-way audio connectors with locking screws. They accept cables with gauges up to 4.5 mm (6 AWG). Even the PCB was not left to chance. The thick copper traces limit signal loss.
 
Technical Specifications
- Crossover Frequency: 900/3600 Hz
- Slope: 12 dB/Oct LP/HP, 6 dB/Oct BP Butterworth
- High Frequency Level: 0/-3 dB
- Mid Frequency Level: 0/-2 dB
- Low Frequency section: 5.165
- Mid Frequency section: 5.050
- High Frequency section: 5.028
- Power Handling: 300 Watt