
The SP4000 is the high-end player in Astell&Kern's A&ultima series. Its chassis is machined from 904L stainless steel, a metal valued for its density and its resistance. It carries a 6-inch 2160 × 1080 touchscreen and runs on Android, combining a local library with streaming services.
The SP4000 lines up four AKM AK4499EX converters backed by four AK4191EQ modulators, a Real Quad DAC architecture. An octa-core processor drives the whole. It reads PCM files up to 768 kHz / 32 bit as well as native DSD, in bit-for-bit playback.
The player offers a 3.5 mm unbalanced output that doubles as an optical output, and a 4.4 mm balanced output, with levels of 4.1 and 8.2 Vrms. On the wireless side, it handles dual-band Wi-Fi and Bluetooth 5.0 with the aptX HD, LDAC and LHDC codecs.
The SP4000 has 256 GB of internal memory, expandable by microSD up to 1.5 TB. Its 6,780 mAh battery delivers around 10 hours of listening. It measures 85 × 149.8 × 19.5 mm, a format that stays portable despite its steel chassis.
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