iBasso DC-Tonfa

Portable DAC/AMP

• 8-Channel Discrete R2R, Fully Differential Architecture
• 312 High-Precision Metal Film Resistors
• 60 Resistors Forming a Hardware Resistor Compensation Network
• In-House Developed FPGA with NOS + 4 Digital Filter Types
• Dual Accusilicon Femtosecond Oscillators
• Linear LT3042 LDO, Lower Noise Than Most Battery Power Supplies
• TI Dual OPAMP2 + BUF634A4
• 800mW + 800mW @ 32Ω, High Output Power
• Low Power Consumption: 100mA / 5V
• Android APK + PC Control Interface
• Supports UAC 1.0 and UAC 2.0 Protocols
• 0.96" OLED Screen + Multi-Function Knob

8-Channel Discrete R2R, True Balanced
Fully Differential Architecture

The DC-Tonfa utilizes a 24-bit fully balanced discrete R2R DAC architecture. It condenses a desktop-DAC-level 8-channel R2R DAC into a compact form factor. The 8-channel R2R, true balanced, fully differential architecture effectively resolves zero-crossing distortion and improves low-level linearity. While retaining the musicality of R2R, it offers detail and performance that surpass traditional R2R designs. Balancing density, dynamics, and natural sound, even in its compact form it delivers the true charm of R2R technology.

312 High-Precision Metal Film Resistors
Three Times That of Other R2R Dongles & Traditional R2R DACs

The DC-Tonfa is equipped with a total of 312 temperature-stable, high-precision metal film resistors that make up the R2R resistor network. The total number of resistors far exceeds that of traditional single-ended R2R DACs. With a hardware resistor compensation network built from 60 high-precision resistors, combined with FPGA software algorithms, resistance tolerance and temperature drift are strictly controlled, resulting in significantly improved linearity and consistency, laying the foundation for pure and realistic sound reproduction.

FPGA + Dual Accusilicon fs Oscillators
AI Core for Premium Sound Quality

iBasso has dedicated 20 years to the portable HiFi field, accumulating extensive in-house developed audio algorithms. The DC-Tonfa employs proprietary FPGA algorithms that can compensate for individual component tolerances in real time, further enhancing the effective accuracy of R2R decoding. Paired with dual Accusilicon femtosecond oscillators, it creates a precise and unified clock source. This effectively reduces the impact of jitter, resulting in a purer, more natural sound with richer and more authentic detail.

NOS Mode + Four Proprietary Digital Filters
Unlocking More Diverse Sound Potential

For a long time, OS and NOS have been almost the only options for R2R DACs. However, with our advanced proprietary FPGA algorithms, the DC-Tonfa breaks through traditional framework limitations and has developed four proprietary digital filters beyond NOS, bringing richer sound expression to R2R — while preserving the unique charm of R2R and giving users greater freedom for sound exploration.

800mW + 800mW @ 32Ω
TI Dual OPAMP x2 & BUF634A x4
Powerful Output in a Compact Size

The DC-Tonfa excels not only in R2R decoding but also in analog amplification. Utilizing an OPAMP + BUF architecture with 2 high-performance TI dual OPAMPs and 4 BUF634A buffers, it builds an audio amplification circuit that far exceeds most other dongles. With an output power reaching up to 800mW + 800mW @ 32Ω, it provides abundant driving power and strong dynamic performance, easily handling a wide range of headphone types and hard-to-drive IEMs!

Linear LT3042 Ultra-Low-Noise LDO
A Reference Power Supply Quieter Than Most Batteries

At the DAC core, a linear LT3042 ultra-low-noise LDO creates a dedicated regulated power supply. With output noise as low as 0.8μV and 100dB power ripple suppression, its noise performance even surpasses that of most battery power solutions. It provides a pure and stable power environment for the 8-channel R2R DAC, fully unleashing the potential of the music.

High Output, Low Power Consumption
Say Goodbye to Smartphone Battery Anxiety

Thanks to efficient circuit design, although the DC-Tonfa delivers top-tier output power among compact DACs, its actual power consumption is very well controlled, achieving a balance between high output and low power consumption. In NOS mode, power consumption is below 100mA/5V (at 48kHz sampling rate), significantly reducing the load on smartphone power supplies. Even paired with power-limited devices like iPhones, you can enjoy long listening sessions.

0.96" OLED Screen + Multi-Function Knob
Convenient Operation, All-in-One Control

The DC-Tonfa is equipped with a 0.96-inch OLED display and a custom-developed encoder, allowing full-function settings via the multi-function knob on the device. Volume adjustment, function settings, filter switching, and more can all be done with one knob, providing a more intuitive, efficient, and enjoyable control experience.

Android APK + PC Control Panel
Rich Tuning Features to Unlock More Sound Possibilities
Suitable for Music, Gaming & Movies

iBasso UAC, an Android app, offers professional adjustments such as digital filters, gain, and channel balance.
The PC control panel requires no installation — simply open it in a browser to access full functionality for the DC-Tonfa.
*Supports Windows and macOS.

Rich Expansion for More Ways to Play
This Is More Than What a Dongle Can Normally Do

The DC-Tonfa supports seamless switching between UAC 2.0 and UAC 1.0 protocols, ensuring broad compatibility with various devices and platforms. The 3.5mm jack also supports SPDIF output.
UAC 2.0 Mode: Connects to iOS and Android smartphones/tablets, as well as Windows, macOS, and Linux computers.
UAC 1.0 Mode: Instantly transforms into an external sound card for gaming consoles like the Switch 2 and PS5. Enjoy crystal-clear game audio and immerse yourself in the gaming experience.
SPDIF Mode: Enables PCM 768kHz digital signal transmission. Switch via internal settings or the UAC app on your phone — turn your smartphone into a professional digital transport!

e-earphone Japan × iBasso Audio Joint Development
Professional Experience x Audio Technology Strengths

e-earphone Japan is a leading HiFi specialty store chain in Japan, deeply rooted in serving customers on the front lines and understanding audiophiles' genuine sound needs and expectations. iBasso partnered with e-earphone Japan for joint development, working closely together on the DC-Tonfa project. From sound orientation to the fine-tuning of details, after extensive development and validation, the goal was to create an audiophile device that more truly reflects the essence of music and offers greater musicality and emotional connection. This collaboration brings the perspective of Japan's professional audio retailers, conveyed through "sound" itself.