Luxury audio auteur Astell&Kern has expanded its flagship portable line-up with the A&ultima SP4000 Copper, a limited-edition version of its top-tier digital audio player, alongside the Collector’s Atelier, a premium leather valet case.
The A&ultima SP4000 Copper sits at the top of Astell&Kern’s player hierarchy and shares the core architecture of the standard SP4000. That includes a quad-DAC configuration, an octa-circuit design and a fully balanced signal path, all intended to preserve signal integrity from digital source to analogue output.
The chassis is milled from 99.98 per cent pure copper, a material long valued in audio engineering for its conductivity and shielding properties, but rarely used at this scale due to its softness and tendency to oxidise.
Astell&Kern says the SP4000 Copper required a multi-layer stabilisation process and highly controlled machining to ensure durability and a consistent finish.
The SP4000 Copper is positioned as a limited-edition product for those who value both sound quality and material craftsmanship…
Astell&Kern A&ultima SP4000 Copper design
Those material choices are not purely cosmetic. Copper’s electrical characteristics are said to reduce internal noise and interference, contributing to a sound signature that emphasises natural tonal weight and low-level detail.
According to the company, the new player delivers authoritative bass, a dense and expressive midrange and treble that decays smoothly, aiming to present music as a cohesive, lifelike whole rather than a collection of Hi-Fi effects.
As with other A&ultima models, the physical interface, screen integration and control layout are designed to support focused listening, reinforcing the sense that this is a purpose-built audio instrument rather than a lifestyle gadget.
Collector’s Atelier valet case review
Alongside the player, Astell&Kern is shipping the Collector’s Atelier, a leather valet case designed to house your digital audio player, earphones and accessories.
The case is made using leather from Perlinger, a German tannery founded in 1864. The leather is premium male calf leather sourced from the Togo region of Africa and treated using Perlinger’s proprietary Shrunken leather process.
This technique avoids the use of heat, instead relying on a chemical shrinking process that preserves the leather’s natural grain and softness.
The result is a material that is supple, elastic and resistant to minor scratches, with a texture that develops greater depth and lustre over time.
The aim, according to the manufacturer, is to create an accessory that enhances the ownership experience and reflects the same attention to detail as the audio gear it houses.
The Astell&Kern A&ultima SP4000 Copper limited edition is priced at £3,999 ($4,499 / €4,699), the Collector’s Atelier valet case is also available, for £229 ($260).
What will tomorrow’s technology look like? If LG Display has its way, it’ll be wearing an OLED face. At K-Display 2026 in Seoul, the Korean display specialist is looking well beyond televisions and smartphones, unveiling a series of OLED innovations that hint at how screens will become woven into everyday life, from humanoid robots and…
Luxury German electronics brand Loewe has unveiled the Antares OLED, a premium smart TV designed to make the screen as much a part of a home’s interior design as its entertainment system. The new line arrives with a modular design that allows owners to tailor its appearance to suit their tastes. Rather than offering a…
Marantz has refreshed its entry-level Hi-Fi range with the launch of the Model 70 integrated amplifier and CD 70 player, successors to the award-winning PM6007 and CD6007. The new components combine the brand’s familiar warm, detailed sound with contemporary connectivity, and adopt Marantz’s latest design language – which to be honest, is gorgeous – with…
The Luxe Review 
Luxury audio auteur Astell&Kern has expanded its flagship portable line-up with the A&ultima SP4000 Copper, a limited-edition version of its top-tier digital audio player, alongside the Collector’s Atelier, a premium leather valet case.
The A&ultima SP4000 Copper sits at the top of Astell&Kern’s player hierarchy and shares the core architecture of the standard SP4000. That includes a quad-DAC configuration, an octa-circuit design and a fully balanced signal path, all intended to preserve signal integrity from digital source to analogue output.
The chassis is milled from 99.98 per cent pure copper, a material long valued in audio engineering for its conductivity and shielding properties, but rarely used at this scale due to its softness and tendency to oxidise.
Astell&Kern says the SP4000 Copper required a multi-layer stabilisation process and highly controlled machining to ensure durability and a consistent finish.
Astell&Kern A&ultima SP4000 Copper design
Those material choices are not purely cosmetic. Copper’s electrical characteristics are said to reduce internal noise and interference, contributing to a sound signature that emphasises natural tonal weight and low-level detail.
According to the company, the new player delivers authoritative bass, a dense and expressive midrange and treble that decays smoothly, aiming to present music as a cohesive, lifelike whole rather than a collection of Hi-Fi effects.
As with other A&ultima models, the physical interface, screen integration and control layout are designed to support focused listening, reinforcing the sense that this is a purpose-built audio instrument rather than a lifestyle gadget.
Collector’s Atelier valet case review
Alongside the player, Astell&Kern is shipping the Collector’s Atelier, a leather valet case designed to house your digital audio player, earphones and accessories.
The case is made using leather from Perlinger, a German tannery founded in 1864. The leather is premium male calf leather sourced from the Togo region of Africa and treated using Perlinger’s proprietary Shrunken leather process.
This technique avoids the use of heat, instead relying on a chemical shrinking process that preserves the leather’s natural grain and softness.
The result is a material that is supple, elastic and resistant to minor scratches, with a texture that develops greater depth and lustre over time.
The aim, according to the manufacturer, is to create an accessory that enhances the ownership experience and reflects the same attention to detail as the audio gear it houses.
The Astell&Kern A&ultima SP4000 Copper limited edition is priced at £3,999 ($4,499 / €4,699), the Collector’s Atelier valet case is also available, for £229 ($260).
LG Display imagines a future where OLED becomes the face of humanoid robots
What will tomorrow’s technology look like? If LG Display has its way, it’ll be wearing an OLED face. At K-Display 2026 in Seoul, the Korean display specialist is looking well beyond televisions and smartphones, unveiling a series of OLED innovations that hint at how screens will become woven into everyday life, from humanoid robots and…
Loewe puts personalisation centre stage with new customisable Antares OLED TV range
Luxury German electronics brand Loewe has unveiled the Antares OLED, a premium smart TV designed to make the screen as much a part of a home’s interior design as its entertainment system. The new line arrives with a modular design that allows owners to tailor its appearance to suit their tastes. Rather than offering a…
Marantz refreshes best-selling Hi-Fi range with stylish Model 70 amp and CD 70 player
Marantz has refreshed its entry-level Hi-Fi range with the launch of the Model 70 integrated amplifier and CD 70 player, successors to the award-winning PM6007 and CD6007. The new components combine the brand’s familiar warm, detailed sound with contemporary connectivity, and adopt Marantz’s latest design language – which to be honest, is gorgeous – with…
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