Estelon the Forza Ultra, the next evolution of Forza. Drawing on technologies developed for Estelon’s flagship platform, the four-way design features all-new Accuton drivers, a redesigned crossover network, Estelon’s proprietary connector system and Stillpoints Ultra SS V2 isolation as standard. Development focused on preserving the scale, natural balance and sculptural identity of the original Forza while improving transparency, dynamic freedom and bass control.

Closer to the performance
“Music carries memory and human expression. Our work is to protect those qualities as the signal moves through the loudspeaker,” says Alfred Vassilkov, Co-founder and Chief Designer of Estelon. “With the Forza Ultra, every engineering change serves the same purpose: the loudspeaker should draw less attention to itself, so the connection between listener and performance becomes more immediate.” The Forza Ultra combines an unmistakable sculptural presence with the acoustic objective of disappearing, leaving the scale, texture and emotional detail of the performance intact.

All-new drivers
The Forza Ultra uses a four-way driver system manufactured by Accuton to Estelon’s specifications. Two custom 250 mm (11 inch) long-stroke aluminium dome woofers feature neodymium motor systems engineered for highly linear excursion. Their low position couples bass energy efficiently to the room, while Estelon’s Symmetric Driver Loading technology gives both woofers the same acoustic load so they move in unison. The result is deep bass with greater definition, authority and control. A custom 190 mm (8 inch) midwoofer and 90 mm (5 inch) midrange bring Accuton’s Crystalid membrane technology to the Forza platform. Crystalid combines high rigidity with low moving mass, supporting fast transient response, low distortion and tonal purity through the frequencies that define the natural character of voices and acoustic instruments. Accuton’s latest-generation 25 mm (1 inch) diamond tweeter uses an updated surround and multi-cavity rear chamber to preserve transient energy and fine detail. Clean extension to 60 kHz supports natural high-frequency reproduction and precise imaging.

Redesigned crossover and direct signal path
A redesigned crossover integrates the new drivers. The networks are tuned through measurement and critical listening for phase integration, time alignment and tonal balance, and are housed in acoustically isolated chambers to reduce vibration and microphonic effects. Estelon’s Flat Foil Direct Coupling connects the crossover components in a star configuration and keeps cable runs short. The components are hand-soldered on a purpose-developed mounting plate that provides precise layout without conventional PCB materials in the signal path. The signal enters through Estelon’s proprietary spring-loaded connector system, first developed for the Extreme Mk II. A high-grade copper foil ribbon runs directly towards the crossover, reducing metal-to-metal interfaces. The system accepts banana plugs, spade connectors and bare wire, and supports bi-wiring.

A stable foundation for music
Stillpoints Ultra SS V2 isolators are supplied as standard. Their ceramic bearing system dissipates vibrational energy and reduces the transfer of micro-vibrations between the 150 kg (330 lb) cabinet and the floor, helping to lower the noise floor and sharpen bass transients. The proprietary marble-based composite cabinet uses non-parallel internal surfaces and dedicated driver chambers to suppress structural resonance and standing waves. Its curved exterior reduces diffraction, while the geometry of the front panel aligns the upper drivers and controls high-frequency dispersion across a wider listening area.

Sculpted for contemporary interiors
The Forza Ultra introduces refinements to the cabinet’s sculpted profile and a new protective grille for the midrange driver. New two-tone finishes pair a Deep Dark Grey base with selected high-gloss colours. Each cabinet is individually finished by skilled artisans through a process of layered painting, wet sanding and hand polishing that takes several weeks.

Bespoke colours remain available on request.

Specifications
- Type: Four-way passive loudspeaker with sealed enclosure
- Frequency response: 27 Hz to 60,000 Hz (linear to 33,000 Hz)
- Power rating: 400 W
- Nominal impedance: 3 ohms
- Minimum impedance: 2.3 ohms at 51 Hz
- Sensitivity: 89 dB at 2.83 V
- Minimum amplifier power: 20 W
- Woofers: 2 x 250 mm custom aluminium dome drivers by Accuton
- Midwoofer: 190 mm custom Crystalid driver by Accuton
- Midrange: 90 mm custom Crystalid driver by Accuton
- Tweeter: 25 mm next-generation diamond driver by Accuton
- Crossover frequencies: 90 Hz, 800 Hz and 2.5 kHz
- Internal cabling: Kubala-Sosna
- Cabinet material: Proprietary marble-based composite
- Isolation system: Stillpoints Ultra SS V2
- Dimensions: 1,675 x 617 x 682 mm (66 x 24 x 27 inches)
- Weight: 150 kg (330 lb) per loudspeaker
- Recommended room size: 40 to 125 m² (430 to 1,345 ft²)