iBasso D17 Atheris Portable DAC and Amplifier

The iBasso D17 Atheris Fuses Discrete R2R and 1-bit DACs with Dual Korg Nutube Amplification, Delivering a rRch, Lifelike Sound and Desktop Power in a Portable Form

• In-house developed R2R + 1bit dual discrete DAC & tube amp
• Four-channel fully balanced symmetric R2R architecture
• Features dual Korg 6PI Nutubes
• FPGA-Master 3.0 ensures nanosecond-level I/O precision
• Delicate sound with a natural analog presentation

A New Benchmark for Portable DAC/Amp's

The D17 utilizes iBasso's in-house developed discrete R2R and 1bit DAC.  It features a four-channel fully balanced symmetrical R2R discrete component DAC, utilizing a total of 284 high-precision film resistors with an accuracy of 0.01%. The R2R decoding provides a natural, delicate sound with a natural analog presentation, offering a unique lively listening experience. The in-house developed 1bit DAC employs 8 sets of 8E, totaling 64 PWM-DACs, delivering a landscape of rich musical details and extremely high resolution audio playback.

D17 Has Three DAC Modes:

• NOS Mode（PCM utilizes R2R DAC decoding, DSD utilizes 1bit DAC decoding）
• All to R2R（OS mode，all to PCM format）
• All to 1bit（SD mode，all to DSD format）

Four-Channel Fully Balanced R2R Architecture

The D17 employs a four-channel fully balanced R2R architecture built around 284 ultra-precise resistors, paired with iBasso’s custom hardware and software compensation for exceptional accuracy. This design achieves an impressive -104 dB THD+N, over 10 dB better than many mainstream R2R DACs, while delivering the warm, detailed, and naturally musical sound signature enthusiasts love. 

Dual Korg 6PI Nutubes

The two Nutube 6P1 tubes on the D17 impart a unique tube character and a warm, mellow yet dynamic texture to the sound. The anode is powered by a 24V high-voltage supply, providing better linearity. Paired with the high-performance TI buffer amplifier BUF634A, it ensures a steady and powerful source of power. As a result, the D17 can deliver over 1200mW + 1200mW at 32Ω, easily driving a wide range of flagship IEMs and high-impedance headphones. 

Opening the Door to Acoustical Realism

In 1bit mode, the four channels L+, L-, R+, and R- each have 16E, totaling 64 PWM-DAC units working together. Controlled by the FPGA-Master 3.0 with nanosecond-level precise I/O delay management while compensating for "wiring delay" to ensure that the signal edges arriving at the DAC are aligned and strictly synchronized. This not only achieves an impressive THD+N of -114dB but also significantly enhances sound detail and density. 

Three-Layer Composite Seismic Isolation System

The D17’s three-layer composite isolation system combines double-layer PCBs and damping materials to disperse stress, cut resonance, and keep microphonic effects below audible levels, placing it at the forefront of iBasso’s tube amp designs

Dual Battery Architecture

With separate batteries powering the DAC and headphone amp, the D17’s dual architecture isolates digital interference and maintains stable current even under heavy loads, delivering clear, distortion-free sound with exceptional musicality.

FPGA-Master 3.0

The D17 is equipped with iBasso's in-house developed FPGA-Master 3.0 architecture, deeply integrated with two Accusilicon ultra-low phase noise femtosecond oscillators to create a pure, unified single clock source. Through nanosecond-level high-precision delay control and real-time clock regeneration technology, the system can simultaneously compensate for R2R decoding and 1bit decoding, reducing clock jitter and distortion to extremely low levels. 

Analog + Digital Volume Controls

The D17 combines a compact 24-position stepped attenuator with ultra-precise ±0.1dB channel matching and DSP-based digital control, delivering exceptionally accurate and flexible volume adjustment

Cutting Edge Parts

Loaded with cutting-edge components, the iBasso D17 Atheris packs 284 ultra-precise 0.01% film resistors, dual 30,000-hour Nutube 6P1 vacuum tubes, and a custom 24-position stepped attenuator with ±0.1 dB channel accuracy. Twin Accusilicon femtosecond oscillators, a pro-grade DSP with 192 dB dynamic range, and an ultra-low-noise 0.6 μV power supply deliver breathtaking clarity, while dual batteries, iBasso film and vintage SPRAGUE capacitors, and a sharp 1.3-inch OLED display round out a portable DAC/amp built for uncompromising performance. 

Technical Specifications

• R2R DAC
  
  • 4.4mm Balanced Phone Out:
    
    • Output Level: 7Vrms (AMP H Gain + DAC H Gain)
    • Output Power: 1200mW + 1200mW @ 32Ω (Distortion <1%)
    • THD+N: -76dB (Tube Amplification)
    • SNR: 116dB (AES17-20K A-weighted)
    • Dynamic Range: 116dB (AES17-20K A-weighted)
    • Crosstalk: 129dB
    • Frequency Response: 15Hz - 22kHz at -1dB
    • 15Hz - 40kHz at -2.5dB
    • Output Impedance: 1.9Ω
  • 3.5mm Single-Ended Phone Out:
    
    • Output Level: 3.5Vrms (AMP H Gain + DAC H Gain)
    • Output Power: 320mW + 320mW @ 32Ω (Distortion <1%)
    • THD+N: -70dB (Tube Amplification)
    • SNR: 112dB (AES17-20K A-weighted)
    • Dynamic Range: 112dB (AES17-20K A-weighted)
    • Crosstalk: 125dB
    • Frequency Response: 15Hz - 22kHz at -1dB
    • 15Hz - 40kHz at -2.5dB
    • Output Impedance: 1Ω
  • 4.4mm Balanced Line Out:
    
    • Output Level: 2.4Vrms (DAC Low Gain)
    • Output Level (High Gain): 4Vrms (DAC High Gain)
    • THD+N: -104dB
    • SNR: 126dB (AES17-20K A-weighted)
    • Dynamic Range: 126dB (AES17-20K A-weighted)
    • Crosstalk: 120dB
    • Frequency Response: 15Hz - 22kHz at -1dB
    • 15Hz - 40kHz at -2.5dB
  • 3.5mm Single-Ended Line Out:
    
    • Output Level (Low Gain): 2Vrms
    • Output Level (High Gain): 2.4Vrms
    • THD+N: -103dB
    • SNR: 120dB (AES17-20K A-weighted)
    • Dynamic Range: 120dB (AES17-20K A-weighted)
    • Crosstalk: 100dB
    • Frequency Response: 15Hz - 22kHz at -1dB
    • 15Hz - 40kHz at -2.5dB
• 1bit DAC
  
  • 4.4mm Balanced Phone Out:
    
    • Output Level: 3.5 Vrms (AMP H Gain + DAC H Gain)
    • Output Power: 340mW + 340mW @ 32Ω (THD < 0.5%)
    • THD+N: -76dB (Tube Amplification)
    • SNR: 109dB (AES17-20K A-weighted)
    • Dynamic Range: 109dB (AES17-20K A-weighted)
    • Crosstalk: 123dB
    • Frequency Response: 15Hz - 22kHz (-1dB)
    • 15Hz - 40kHz (-2.5dB)
    • Output Impedance: 1.9Ω
  • 3.5mm Single-Ended Phone Out
    
    • Output Level: 1.7 Vrms (AMP H Gain + DAC H Gain)
    • Output Power: 87mW + 87mW @ 32Ω (THD < 1%)
    • THD+N: -70dB (Tube Amplification)
    • SNR: 104dB (AES17-20K A-weighted)
    • Dynamic Range: 104dB (AES17-20K A-weighted)
    • Crosstalk: 118dB
    • Frequency Response: 15Hz - 22kHz (-1dB)
    • 15Hz - 40kHz (-2.5dB)
    • Output Impedance: 1Ω
  • 4.4mm Balanced Line Out
    
    • Output Level: 2 Vrms (DAC Low Gain)
    • Output Level: 2.4 Vrms (DAC High Gain)
    • THD+N: -114dB
    • SNR: 118dB (AES17-20K A-weighted)
    • Dynamic Range: 118dB (AES17-20K A-weighted)
    • Crosstalk: 120dB
    • Frequency Response: 15Hz - 22kHz (-1dB)
    • 15Hz - 40kHz (-2.5dB)
  • 3.5mm Single-Ended Line Out
    
    • Output Level: 1 Vrms (DAC Low Gain)
    • Output Level: 1.2 Vrms (DAC High Gain)
    • THD+N: -110dB
    • SNR: 114dB (AES17-20K A-weighted)
    • Dynamic Range: 114dB (AES17-20K A-weighted)
    • Crosstalk: 100dB
    • Frequency Response: 15Hz - 22kHz (-1dB)
    • 15Hz - 40kHz (-2.5dB)
• Inputs:
  
  • USB-C (DATA): Supports PCM 768kHz / DSD512
  • 3.5mm Coaxial: Supports PCM 768kHz / DOP256
  • 3.5mm Optical: Supports PCM 192kHz / DOP128
• Outputs:
  
  • 4.4mm Balanced PO, 4.4mm Balanced LO
  • 3.5mm Single-ended PO, 3.5mm Single-ended LO
  • USB-C (Charge): Supports 5V/3A and QC3.0 quick charging
• Charging Time: 3 hours
• Playtime: 15 hours
• Dimensions: 145mm x 86.3mm x 31.6mm
• Weight: 470g

What's Included

• iBasso D17 Atheris 
• Case
• Carrying pouch
• Cables
• User manual