PW Audio Adapter Turning Box for Astell & Kern AK SP4000 Digital Audio Player
The PW Audio Adapter Turning Box for Astell & Kern AK SP4000 exemplifies PW Audio’s design ethos — “crafted with heart, listened with passion.” Whether in entry-level or flagship models, the brand continues its mission to connect listeners with the warmth and authenticity of music. This brass-bodied tuning box perfectly embodies PW Audio’s philosophy: refining music from within through material quality, design precision, and heartfelt craftsmanship.
Design Philosophy
Moving beyond conventional aluminum housings, the SP4000 Adapter Turning Box features a high-density brass chassis — a choice that significantly enhances both structural durability and sonic texture. Brass offers superior resonance control and electromagnetic interference suppression, ensuring blacker backgrounds, refined quietness, and rich sonic layering. The result is a tonal presentation that feels organic, dynamic, and vividly detailed.
Acoustic Characteristics
The brass shell adds warmth and body across the frequency spectrum. Midrange reproduction is smooth and full, bass notes reach deeper yet remain controlled, while treble maintains exquisite finesse without harshness. This combination yields a pure, natural sound that appeals to both discerning audiophiles and music lovers chasing emotional connection through sound.
Precision Engineering
Built using 3D printing technology, the adapter features a precision-designed internal framework to control micro-vibration and microphonic interference. This ensures superb purity and sonic stability. The terminals utilize beryllium-copper 4.4mm gold-plated balanced connectors for enhanced conductivity and resilience, alongside a brass 3.5mm gold-plated single-ended jack that delivers a natural, warm tone.
Versions & Sound Profiles
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Orpheus Ver.: Tuned for ultimate detail and airiness. Ideal for classical, jazz, vocal, and acoustic music. This version accentuates micro-detail — capturing breath nuances, subtle string vibrations, and vivid live atmosphere. Expect a wide soundstage, exceptional layering, and silky high-end extension that’s never fatiguing.
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Reference Ver.: Balanced, precise, and fast. Perfect for pop, rock, electronic, and orchestral genres. Offers excellent transient response, clear contours, powerful yet clean bass impact, and pinpoint imaging with dynamic control.
Technical Specifications
| Product Name |
PW Audio Adapter Turning Box for Astell&Kern SP4000 |
| Housing Material |
High-density brass chassis |
| Internal Design |
3D-printed vibration-controlled support architecture |
| Connectors |
4.4mm gold-plated beryllium copper (balanced) / 3.5mm gold-plated brass (single-ended) |
| Variants |
Orpheus Version / Reference Version |
| Recommended For |
Astell & Kern AK SP4000 Digital Audio Player |
| Sound Signature |
Refined, natural, warm tonality with deep bass and expansive stage |
| Manufacturing |
Handcrafted by PW Audio |
Why Choose PW Audio?
PW Audio believes that music is more than just sound — it’s emotion, temperature, and memory. Each product aims to bring warmth and humanity back to listening experiences dominated by numbers and data. Choosing PW Audio means embracing passion, craftsmanship, and devotion to the art of sound.
Bring your Astell & Kern AKSP4000 to life with the PW Audio Adapter Turning Box — precision, power, and poetry in one.
