Astell&Kern SP4000 Review: The Astell&Kern A&ultima SP4000 represents the pinnacle of portable digital audio players (DAPs) in 2025. Unveiled at High End Munich, this flagship model takes over from the legendary SP3000, introducing groundbreaking audio architecture, full Android support, and a luxury design.
Now available globally and expected soon in Pakistan, the SP4000 is designed for audiophiles who want unmatched clarity, precision, and power.
Premium Build Quality & Design
- Material: Crafted from 904L stainless steel, known for its strength and corrosion resistance (used in luxury watches).
- Back Panel: PVD-coated ceramic finish enhances durability and heat resistance.
- Included Case: Handmade leather case by Perlinger (Germany).
- Display: 6-inch 2K touchscreen with the all-new 4.5-generation Crimson UI.
The SP4000 feels like a piece of precision engineering—solid, sleek, and ergonomic.
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Advanced Audio Architecture
At the heart of the SP4000 is an Octa-DAC setup:
- Dual AK4191EQ digital filters + dual AK4499EX DACs per channel
- True 1:1 configuration per channel for low distortion and high resolution
- High Driving Mode with parallel op-amps offers rich dynamics and clean amplification
- ESA (Enhanced Signal Alignment) minimizes timing mismatches for improved stereo imaging
- Ultra-low-noise LDO regulators reduce power supply interference
This is Astell&Kern’s most refined audio signal path ever, bringing you closer to studio-master quality.
Playback, Features & File Support
- Digital Audio Remaster (DAR) 2.0 improves low-res music through upsampling
- Virtual Sound Extender simulates spacious, open-back soundstage
- Supports PCM 32-bit/768kHz, DSD512, MQA, FLAC, ALAC, and more
- Features ReplayGain, hardware crossfeed, and AK File Drop for wireless file transfers
Whether you’re listening to classical, jazz, or hi-fi rock, this player delivers perfect detail and separation.
Software: Now with Full Android + Google Play
Unlike previous models, the SP4000 runs a full version of Android with:
- Google Play Store access (no sideloading required)
- Audio Direct Path (ADP) to bypass Android’s internal audio processing for bit-perfect streaming
- Compatible with all apps: TIDAL, Qobuz, Apple Music, Spotify, YouTube Music
The new UI also improves responsiveness, animations, and multitasking.
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Storage, Connectivity & Battery
| Feature | Specification |
|---|---|
| Internal Memory | 256GB |
| Expandable | microSD up to 1.5TB |
| Battery Life | Up to 10 hours |
| Charging | USB-C with Quick Charge 3.0 |
| Connectivity | Wi-Fi, DLNA, USB DAC, Bluetooth 5.0 (aptX Adaptive, LDAC, BT Sink) |
| Certification | Roon Ready for seamless streaming |
Price in Pakistan & International Markets
| Region | Estimated Price |
|---|---|
| USA/Europe | USD $5,000 – $5,400 |
| Pakistan | PKR 1,400,000 – 1,600,000 (approx., depends on retailer & import tax) |
- Currently available for pre-order globally.
- Expected to arrive in premium audio stores in Pakistan by Q3 2025.
Astell&Kern SP4000 vs SP3000 – What’s New?
| Feature | SP3000 | SP4000 |
|---|---|---|
| DAC | 1:2 configuration | 1:1 Octa-DAC setup |
| Power Circuitry | Single op-amp | Parallel op-amps |
| Android Support | Limited (no Play Store) | Full Android + Play Store |
| Signal Alignment | Standard | Enhanced (ESA) |
| Noise Control | Conventional | Ultra-low-noise LDO |
| UI | Gen 4.0 | Gen 4.5 (Crimson) |
The SP4000 is a true upgrade, not just an iteration.
Final Thoughts
The Astell&Kern SP4000 redefines what a portable music player can be in 2025. It blends cutting-edge audio engineering with the flexibility of Android, allowing users in Pakistan and around the world to experience reference-grade sound on the go.
Whether you’re a professional sound engineer, a serious audiophile, or a luxury tech collector, the SP4000 is the ultimate DAP worth your investment. Stay tuned with Bloom Pakistan
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