Nunchaku: A World Class Portable Tube DAC/Amp
The iBasso Nunchaku is a premium portable DAC and amplifier that combines cutting-edge technology with the charm of analog sound. Powered by two Raytheon JAN6418 directly heated vacuum tubes, it delivers a rich, warm, and engaging “tube flavor” in TUBE mode, while Class AB mode provides a clean, distortion-free experience. A dedicated 22.5V anode power supply ensures superior headroom and peak performance, enhancing audio fidelity.
At its core, the Nunchaku features a high-performance Cirrus Logic CS43198 DAC chip, a benchmark in conversion and renowned for its exceptional resolution, accurate sound reproduction, wide dynamic range, and exceptionally low noise floor. To minimize microphonic effects, the tubes are suspended using PORON material, reducing vibrations for pristine audio quality. Each unit undergoes APX555 testing to ensure meticulously matched tube pairs, with only 50 pairs completed daily, guaranteeing consistent, exceptional performance.
The Nunchaku offers audiophiles a versatile, portable solution with the perfect blend of modern precision and analog warmth.
Dual JAN6418 Tubes
The Nunchaku features x2 Raytheon JAN6418 directly heated vacuum tubes, valued for their compact size, low power use, and reliability. Unlike typical portable devices with 5V or 12V power supplies, it uses a 22.5V anode power supply, ensuring superior headroom and optimal tube performance.
These tubes deliver a warm, smooth “tube sound” for an authentic analog listening experience. To reduce microphonic effects, iBasso suspends the tubes with PORON material, effectively minimizing vibrations and ensuring pristine audio quality.
For consistent sound, iBasso carefully matches the tubes using advanced APX555 testing, a meticulous process limited to 50 pairs daily, guaranteeing outstanding performance in every Nunchaku.
Unleashing Power + Audio Excellence
Departing from the typical all-in-one chip approach found in most dongles, the Nunchaku adopts a sophisticated OPAMP+BUF634 flagship architecture. This design integrates x2 Raytheon vacuum tubes, x4 TI high-performance dual operational amplifiers (OPAMPs), and x4 BUF634A buffers into a compact footprint.
Nunchaku delivers up to 525mW+525mW@320Ω in TUBE mode, effortlessly powering flagship IEMs and most headphones. Despite its power, the Nunchaku remains energy-efficient, consuming just 120mA/5V in TUBE mode and under 100mA/5V in Class AB mode.
JRC Hardware Volume Control
In TUBE mode, the Nunchaku incorporates a precise JRC hardware volume control. This innovative approach ensures the DAC operates at its MAX output level, followed by a tube amp stage and then volume control. This unique architecture effectively reduces noise as the volume is lowered, significantly enhancing the SNR and delivering a more refined listening experience.
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