SMSL R100 Dual AD1861-J R2R Desktop DAC
The SMSL R100 Desktop DAC bridges nostalgic vintage audio engineering with modern digital signal processing. By pairing coveted multi-bit R-2R converter chips with precision DSP customization, SMSL delivers a desktop source component tailored for audiophiles seeking musicality without sacrificing modern high-resolution capability.
Classic Multi-Bit R-2R DAC Architecture
At the core of the SMSL R100 is a dual-mono configuration featuring two Analog Devices AD1861-J R-2R ladder DAC chips. Unlike modern delta-sigma designs that rely on high-frequency noise-shaping and oversampling, multi-bit ladder DACs process digital signals directly through precision resistor network arrays. This classic architecture produces an inherently organic, fluid, and non-fatiguing presentation—delivering natural instrument timbres, warm vocals, and a coherent soundstage that avoids the artificial harshness often associated with digital playback.
Modern High-Resolution Signal Processing
While built around classic R-2R silicon, the R100’s modern digital front-end ensures complete compatibility with today's highest-resolution digital formats. The DAC natively supports PCM signals up to 32-bit/768kHz as well as Direct Stream Digital (DSD) up to DSD512. Whether streaming lossless tracks from high-res platforms or playing bit-perfect local files, the processing engine preserves micro-details and acoustic room cues across all sample rates.
Web-Based Parametric EQ (PEQ) Customization
The SMSL R100 includes an onboard Parametric Equalizer (PEQ) accessible through a web-based, driver-free interface. Listeners can fine-tune target frequency responses to complement specific headphones, speakers, or room acoustics directly from a browser on any operating system. Once dialled in, custom EQ curves can be saved to hardware presets (EQ1 / EQ2) stored on the device itself, providing persistent hardware-level DSP without requiring background software running on your host device.
Balanced & Single-Ended Analog Outputs
To integrate seamlessly into modern desktop and Hi-Fi setups, the R100 offers both balanced XLR and single-ended RCA line outputs:
| Output Type |
Level (Vrms) |
Dynamic Range |
Signal-to-Noise Ratio (SNR) |
| Balanced XLR |
3.5 Vrms |
107 dB |
107 dB |
| Single-Ended RCA |
1.75 Vrms |
108 dB |
108 dB |
Note: Both outputs feature a 33Ω output impedance, offering stable drive signal integrity into preamps, integrated amplifiers, or powered monitor setups.
Low Distortion & Measured Performance
Achieving high fidelity with discrete R-2R ladder networks requires strict tolerance matching. The R100 maintains low noise and distortion across the audio spectrum:
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Total Harmonic Distortion + Noise (THD+N): 0.003% (-90dB)
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Dynamic Range: 107dB (XLR) / 108dB (RCA)
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Signal-to-Noise Ratio: 107dB (XLR) / 108dB (RCA)
This combination ensures that vintage-style tonal warmth is backed by clean dynamic headroom and a low noise floor for quiet background passages.
Precision CNC Aluminum Chassis
The chassis is crafted from a solid block of aluminum using precision CNC machining, providing both structural rigidity and resistance to external electromagnetic interference (EMI/RFI). The enclosure features integrated transparent viewing windows, giving users a clear look at the internal circuit topology and the vintage AD1861-J chips inside.
Comprehensive Digital Connectivity
Designed as a versatile central hub for desktop sources, the R100 offers three primary digital inputs:
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USB-B Input: Supports full high-resolution PCM 768kHz and DSD512 decoding from PCs, Mac, and dedicated streamers.
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Optical (Toslink): Connects TVs, games consoles, or legacy CD transports.
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Coaxial (S/PDIF): Ideal for network streamers, digital audio players (DAPs), or dedicated transport units.
About SMSL
Foshan ShuangMuSanLin Electronics Co., Ltd. (SMSL) is a established manufacturer in high-fidelity desktop audio. Specializing in digital-to-analog converters, balanced headphone amplifiers, and power amps, SMSL has built a global reputation for combining rigorous bench performance, clean industrial design, and practical feature sets across various price tiers.
Technical Specifications
Input: USB / Optical / Coaxial
Output: XLR / RCA
Output Level: XLR 3.5Vrms, RCA 1.75Vrms
THD+N: 0.003% (-90dB)
Dynamic Range: XLR 107dB, RCA 108dB
SNR: XLR 107dB, RCA 108dB
Output Impedance: 33Ω
USB Compatibility: Windows 7/8/8.1/10/11 (Needs Driver), Mac OS X 10.6 or Later / Linux (Driverless)
Bit Depth: USB 1bit, 16~32bit; Optical / Coaxial 1bit, 16~24bit
Sampling Rate (USB): PCM 44.1~768kHz, DSD 2.8224~22.5792MHz, DoP 2.8224~11.2896MHz
Sampling Rate (Optical / Coaxial): PCM 44.1~192kHz, DSD DSD64 (DoP)
Power Consumption: 2.6W
Standby Power: <1W
Size: 170 × 39.8 × 136 mm (W×H×D)
Weight: 712g / 1.57lbs
Q&A
What DAC chips does the SMSL R100 use?
Dual ADI AD1861-J R-2R DAC chips.
What is the maximum sampling rate supported via USB?
PCM up to 32-bit/768kHz and DSD512.
Does the R100 have both balanced and single-ended outputs?
Yes, it has XLR and RCA outputs.
Does the R100 support Web-based PEQ?
Yes, it features a driver-free Web-based PEQ.
What is the power consumption?
2.6W (standby power <1W).
