iBasso Nunchaku

Product information "iBasso Nunchaku"
Dongle DAC/AMP with two tubes 

  • Two Raytheon JN6418 tubes 
  • 22.5V anode power supply 
  • TUBE and Class AB output modes 
  • Four Ti Dual OPAMP + four BUF634A 
  • 525mW+525mW@3232Ω output power 
  • 120mA/5V power consumption 
  • Two CS43198 flagship DAC chipsets 
  • In-house developed FPGA 
  • KDS femtosecond oscillator 
  • JRC hardware volume control 
  • 0, 96’ OLED +multi-function knob 
  • 4.4mm+3.5mm outputs 
  • Native DSD512x PCM 32bit/768kHz 
  • Android APK 

Two Raytheon JAN6418 tubes 
22. 5V anode power supply 
The Nunchaku utilises two Raytheon JAN6418 direct-heated vacuum tubes, renowned for their compact size, low power consumption and operational stability. Unlike most portable products that are powered by a 9 or 12 volt power supply, the Nunchaku has a 22.5 volt anode power supply specifically for the JAN6418 tubes. This higher voltage provides greater headroom and ensures that the tubes operate at their full potential. 
The two JAN6418 tubes give the Nunchaku a distinctly analogue sound with a warm, relaxed and smooth ‘tube sound’ that is pleasant to listen to. This allows the Nunchaku to present an analogue musical experience. 

TUBE and Class AB output modes 
Tube sound and precise sound are switchable 
In addition to the TUBE output mode, the Nunchaku also has a Class AB amplifier circuit that allows the user to switch between these two output modes. In TUBE mode, the sound is sweet and warm, showing the amazing quality of tubes; the Class AB mode has a higher resolution with plenty of dynamics. 
* Due to the sensitive nature of the tube, the Nunchaku has some microphonic effect in TUBE mode. If you tap the body of the device while the music is paused, you may hear ringing, which is normal. In addition, there may be occasional interference from the phone. During music playback, these noises are usually masked and do not affect the actual listening experience. 
* In Class AB mode, there are no microphonic effects, noise, background noise, etc. 

Dual OPAMP x4 + BUF634A x4 
Luxurious configuration, comparable to flagship players 
Unlike most dongles that use all-in-one headphone amplifier chips, the Nunchaku utilises the OPAMP+BUF634 structure. This is often only used in audio players. The Nunchaku uses 2 pieces of Raytheon tubes + 4 pieces of TI high power dual OPAMPs + 4 pieces of BUF634A. In such a compact size, the Nunchaku offers a precision audio structure that far surpasses that of an ordinary dongle, achieving unprecedented sound performance. 

525mW+525mW@32Ω 
Stunning output power 
The output power of the Nunchaku in TUBE mode is up to 525mW+525mW@32Ω, which can easily drive all kinds of flagship IEMs and most headphones. The Nunchaku uses 2 pieces of Raytheon tubes + 4 pieces of TI high power dual OPAMP + 4 pieces of BUF634A, creating a powerful headphone amplifier in a very compact size. In addition, the power consumption of the Nunchaku is excellent, with a current consumption of only 120mA/5V in tube mode, which is lower than most dongles. The power consumption of the Class AB output is even less than 100mA/5V. 

CS43198×2 Flagship DAC 
A highly acclaimed DAC solution 
Cirrus Logic's flagship CS43198 DAC chip has an excellent reputation for resolution, sound reproduction, dynamic range and extremely low noise floor. iBasso has achieved perfection in tuning CS chips, and the Nunchaku features a dual CS43198 design that enhances your music experience even further. 

In-house developed FPGA 
KDS femtosecond oscillator 
JRC hardware volume control In TUBE mode, the Nunchaku features JRC hardware volume control. The DAC operates at the maximum output power of a tube amplifier with JRC hardware volume control. When the volume is lowered, the noise is also reduced, which improves the signal-to-noise ratio. 

0.96‘ OLED screen + multifunction knob 
Simple & uncomplicated operation 
The Nunchaku is equipped with a 0.96’ OLED display and its own rotary encoder. The user can control all functions with the multifunction knob. In addition, the Nunchaku has an Android APP that can be used to make a variety of settings. 

PORON suspension 
After numerous trials, iBasso has finally implemented a ‘suspended’ installation using PORON material to suspend the tubes in the housing, thus achieving effective shock absorption and reducing the microphonic effect. 

Tube selection on the APX555 
Manually matching the tubes one by one 
The manufacturing process for tubes is subject to certain limitations, so there may be small variations in each tube. To ensure that the differences in sound quality between each JAN6418 tube are manageable, the team at iBasso performs a SINAD pairing with the APX555 audio tester before each pair is used in production. Due to the extensive testing process, iBasso is limited to 50 pairs of tubes per day. The aim of all these measures is to ensure the highest quality audio output.
Color: Grau, Red
Specifications
DAC: Two Cirrus Logic CS43198 
PCM: Up to 32bit/768kHz 
DSD: Native DSD 512x 
Weight: 1.7 ounces 
Dimensions: 65mm x 34.6mm x 15mm 
4.4mm balanced output (AB mode) 
THD+N: -119dB (0.00011%) @1kHz 200kΩ load 
Output voltage 2.8Vrms (low gain) 4.1Vrms (high gain) 
Output power: 450mW@32Ω 
Signal to noise ratio: 130dB 
Dynamic range: 130dB 
Crosstalk: 145dB 
Frequency response: 15Hz-40kHz ±0.5dB 
4.4mm balanced output (TUBE mode) 
Output voltage 2.3Vrms (low gain) 4.5Vrms (high gain) 
Output power: 525mW@32Ω 
Signal to noise ratio: 107dB 
Dynamic range: 110dB 
Crosstalk: 82dB 
Frequency response: 15Hz-40kHz ±1dB 
3.5mm single-ended output (AB mode) 
THD+N: -115dB (0.00017%) @1kHz 600kΩ load 
Output voltage 1.4Vrms (low gain) 2Vrms (high gain) 
Output power: 125mW@32ohms 
Signal to noise ratio: 125dB 
Dynamic range: 125dB 
Crosstalk: 116dB 
Frequency response: 15Hz-40kHz ±0.5dB 
3.5mm single-ended output (TUBE mode) 
Output voltage 1.15Vrms (low gain) 2.25Vrms (high gain) 
Output power: 150mW@32Ω 
Signal to noise ratio: 112dB 
Dynamic range: 112dB 
Crosstalk: 82dB 
Frequency response: 15Hz-40kHz ±1dB 

What`s in the box: 
iBasso Nunchaku 
Protective cover 
USB-C to USB-C cable 
USB-C to Lightning cable 
USB-A adapter 
User manual
Informationen zum Hersteller
Dongle DAC/AMP with two tubes 

  • Two Raytheon JN6418 tubes 
  • 22.5V anode power supply 
  • TUBE and Class AB output modes 
  • Four Ti Dual OPAMP + four BUF634A 
  • 525mW+525mW@3232Ω output power 
  • 120mA/5V power consumption 
  • Two CS43198 flagship DAC chipsets 
  • In-house developed FPGA 
  • KDS femtosecond oscillator 
  • JRC hardware volume control 
  • 0, 96’ OLED +multi-function knob 
  • 4.4mm+3.5mm outputs 
  • Native DSD512x PCM 32bit/768kHz 
  • Android APK 

Two Raytheon JAN6418 tubes 
22. 5V anode power supply 
The Nunchaku utilises two Raytheon JAN6418 direct-heated vacuum tubes, renowned for their compact size, low power consumption and operational stability. Unlike most portable products that are powered by a 9 or 12 volt power supply, the Nunchaku has a 22.5 volt anode power supply specifically for the JAN6418 tubes. This higher voltage provides greater headroom and ensures that the tubes operate at their full potential. 
The two JAN6418 tubes give the Nunchaku a distinctly analogue sound with a warm, relaxed and smooth ‘tube sound’ that is pleasant to listen to. This allows the Nunchaku to present an analogue musical experience. 

TUBE and Class AB output modes 
Tube sound and precise sound are switchable 
In addition to the TUBE output mode, the Nunchaku also has a Class AB amplifier circuit that allows the user to switch between these two output modes. In TUBE mode, the sound is sweet and warm, showing the amazing quality of tubes; the Class AB mode has a higher resolution with plenty of dynamics. 
* Due to the sensitive nature of the tube, the Nunchaku has some microphonic effect in TUBE mode. If you tap the body of the device while the music is paused, you may hear ringing, which is normal. In addition, there may be occasional interference from the phone. During music playback, these noises are usually masked and do not affect the actual listening experience. 
* In Class AB mode, there are no microphonic effects, noise, background noise, etc. 

Dual OPAMP x4 + BUF634A x4 
Luxurious configuration, comparable to flagship players 
Unlike most dongles that use all-in-one headphone amplifier chips, the Nunchaku utilises the OPAMP+BUF634 structure. This is often only used in audio players. The Nunchaku uses 2 pieces of Raytheon tubes + 4 pieces of TI high power dual OPAMPs + 4 pieces of BUF634A. In such a compact size, the Nunchaku offers a precision audio structure that far surpasses that of an ordinary dongle, achieving unprecedented sound performance. 

525mW+525mW@32Ω 
Stunning output power 
The output power of the Nunchaku in TUBE mode is up to 525mW+525mW@32Ω, which can easily drive all kinds of flagship IEMs and most headphones. The Nunchaku uses 2 pieces of Raytheon tubes + 4 pieces of TI high power dual OPAMP + 4 pieces of BUF634A, creating a powerful headphone amplifier in a very compact size. In addition, the power consumption of the Nunchaku is excellent, with a current consumption of only 120mA/5V in tube mode, which is lower than most dongles. The power consumption of the Class AB output is even less than 100mA/5V. 

CS43198×2 Flagship DAC 
A highly acclaimed DAC solution 
Cirrus Logic's flagship CS43198 DAC chip has an excellent reputation for resolution, sound reproduction, dynamic range and extremely low noise floor. iBasso has achieved perfection in tuning CS chips, and the Nunchaku features a dual CS43198 design that enhances your music experience even further. 

In-house developed FPGA 
KDS femtosecond oscillator 
JRC hardware volume control In TUBE mode, the Nunchaku features JRC hardware volume control. The DAC operates at the maximum output power of a tube amplifier with JRC hardware volume control. When the volume is lowered, the noise is also reduced, which improves the signal-to-noise ratio. 

0.96‘ OLED screen + multifunction knob 
Simple & uncomplicated operation 
The Nunchaku is equipped with a 0.96’ OLED display and its own rotary encoder. The user can control all functions with the multifunction knob. In addition, the Nunchaku has an Android APP that can be used to make a variety of settings. 

PORON suspension 
After numerous trials, iBasso has finally implemented a ‘suspended’ installation using PORON material to suspend the tubes in the housing, thus achieving effective shock absorption and reducing the microphonic effect. 

Tube selection on the APX555 
Manually matching the tubes one by one 
The manufacturing process for tubes is subject to certain limitations, so there may be small variations in each tube. To ensure that the differences in sound quality between each JAN6418 tube are manageable, the team at iBasso performs a SINAD pairing with the APX555 audio tester before each pair is used in production. Due to the extensive testing process, iBasso is limited to 50 pairs of tubes per day. The aim of all these measures is to ensure the highest quality audio output.
EU-Verantwortlicher
NT Global Distribution GmbH
Waller Heerstr. 104
28219 Bremen
Deutschland
www.nt-global.de
info@nt-global.com