Building upon the renowned legacy of the X Diamond Mk II, the X Diamond Signature Edition pushes the boundaries of audio engineering even further, introducing a host of enhancements and upgrades derived from Estelon’s flagship Forza and Extreme Mk II models. Its soaring, sculptural cabinet houses premium components meticulously chosen to deliver exceptional clarity, dynamics, and emotional engagement in any high-performance listening environment.

The X Diamond Mk II system’s engineering advancements include a new ultra-hard diamond tweeter and a new crossover network with improved components for a wider dynamic range and transparency. The X Diamond Mk II incorporates new cabling that contributes to an exhilarating audio experience.

“The Estelon X Diamonds get my highest and most enthusiastic recommendation.”

Jonathan Valin, The Absolute Sound

The X Diamond Signature Edition features top-of-the-line Kubala-Sosna internal cabling with OptimiZ™ technology architecture, enhancing transparency in the midrange and highs while delivering a larger soundstage, improved separation, and enhanced micro-detail. The crossover filter scheme and topology have been updated with Mundorf Ultra resistors and resin-baked coils for even greater resolution and dynamic expression.

A proprietary connector system inspired by piano keys replaces conventional binding posts. These spring-loaded connectors use copper foil ribbons for direct signal transmission, eliminating unnecessary metal-to-metal transitions and ensuring unparalleled purity and clarity from bass to highs. Crafted from precision 3D-printed high-quality polyamide with no metal parts or high dielectric constant materials, these connectors are adaptable to banana, spade, or bare wire connections.

The crossover network is isolated in its own chamber, using second-order slopes with crossover points at 86 Hz and 2 kHz. Components are hand-selected — Mundorf and Jantzen capacitors, Goertz copper foil inductors, and Mundorf steel-core inductors — all hand-soldered using point-to-point wiring for maximum signal purity.

All Estelon products are produced using the same general design and construction principles. Through advanced and innovative engineering concepts, Estelon loudspeakers form a synergy with the room and its acoustics to re-create an emotionally involving listening experience that exposes the soundstage and musical details of the recording, as it was meant to be heard. Estelon engineering took many years of research and testing to develop a proprietary marble-based composite material and special moulding technology capable of producing cabinets with such advanced surface geometry, inside and out.

The unique shape of the cabinet is highly complex and differs greatly from a classical box design. The combination of curved cabinet walls and an intricate system of interior chambers makes the cabinet non-resonant, with no flat or parallel surfaces inside or out. Each driver is housed in its own optimised chamber, while internal dampening materials are precisely placed to ensure tonal balance and detail throughout the frequency range.

The X Diamond Signature Edition uses a three-driver system, all custom-designed with Accuton: one woofer, one mid-woofer, and one tweeter. These high-quality drivers are designed and produced by German driver manufacturer Thiel & Partner GmbH under the brand name Accuton and are revered globally among the very best available. Each driver is housed in a dedicated chamber — the woofer in a bass reflex chamber with a rear port, the tweeter in an isolated enclosure with a precisely shaped surrounding surface for controlled dispersion. All three drivers are placed on a curved front panel, ensuring sound from each driver arrives simultaneously at the listening position.

The X Diamond Signature Edition comes equipped with Stillpoints Ultra SS V2 isolation feet to ensure consistency across different floor types while improving soundstage and bass articulation. Each cabinet is hand-finished over several weeks using a multi-layer painting and polishing process, with striking stainless steel accent details meticulously crafted by hand. Each speaker panel proudly bears the signature of Alfred Vassilkov, symbolising his unwavering commitment to excellence.

Specifications