SMSL R100 R2R Desktop DAC

R2R DAC with web-based PEQ The SMSL R100 is a desktop R2R DAC centered around two Analog Devices AD1861-J converter chips, with support for high-resolution PCM and DSD playback, web-based parametric EQ, dedicated digital filtering, and both balanced XLR and RCA analog outputs. Its CNC-machined aluminum chassis includes dual top viewing windows that reveal the internal circuitry, while USB, optical, and coaxial inputs provide flexible connectivity for desktop and hi-fi systems. Dual AD1861-J R2R conversion Two AD1861-J R2R DAC chips handle digital-to-analog conversion using a resistor-ladder architecture associated with a natural, relaxed tonal presentation. SMSL pairs the converters with a proprietary de-glitch circuit designed to reduce transient conversion errors, signal distortion, digital noise, and unwanted artifacts during processing. High-resolution PCM and DSD support The R100 supports PCM playback up to 32-bit/768kHz over USB, along with DSD rates up to 22.5792MHz. Optical and coaxial connections support PCM up to 24-bit/192kHz and DSD64 through DoP. A dedicated DSD conversion algorithm allows DSD source material to be processed through the R2R architecture. Web-based parametric EQ A browser-accessible PEQ system lets you adjust frequency response without installing dedicated software. Direct EQ, EQ1, and EQ2 provide three independent sound modes, with parameter storage for recalling saved tuning profiles. Precision digital filtering SMSL uses a self-developed high-precision SPDIF digital filter algorithm to manage incoming digital signals. The processing is designed to reduce clock-jitter effects and maintain stable digital transmission, supporting clearer separation and more consistent detail from optical and coaxial sources. Balanced and RCA outputs The rear panel provides balanced XLR and single-ended RCA outputs for connection to a range of amplifiers and powered audio systems. Rated output level is 3.5Vrms through XLR and 1.75Vrms through RCA, with a specified output impedance of 33 ohms. Measured audio performance SMSL lists THD+N at 0.003% and provides Audio Precision APx555 B measurement data showing balanced line-output THD+N of approximately 0.0025%. Rated balanced dynamic range and SNR are both 107dB, while RCA dynamic range and SNR are rated at 108dB. Gold-plated signal connections Gold-plated input and output connectors are used to help maintain stable electrical contact over time. The plating is intended to improve resistance to oxidation, corrosion, and wear while minimizing losses at the connection points. CNC-machined aluminum chassis The R100 chassis is produced with integrated CNC milling followed by grinding and polishing processes. Its rigid aluminum construction is designed to provide a stable enclosure for the internal audio circuitry while keeping the footprint compact enough for desktop systems and equipment racks. Dual top viewing windows Two transparent panels on the top of the chassis expose sections of the internal hardware layout. They provide a clear view of the component arrangement while giving the R100 a distinctive physical design centered on its internal engineering. Broad computer compatibility USB operation supports Windows 7, 8, 8.1, 10, and 11 with a driver. macOS 10.6 or later and Linux are supported without a dedicated driver, making the R100 suitable for a wide range of computer-based audio systems. Product highlights Dual Analog Devices AD1861-J R2R DAC chips Proprietary de-glitch processing circuit PCM support up to 32-bit/768kHz over USB DSD support up to 22.5792MHz over USB DSD64 DoP support over optical and coaxial Web-based parametric EQ Direct EQ, EQ1, and EQ2 memory modes Self-developed high-precision SPDIF digital filtering Balanced XLR and RCA analog outputs Gold-plated input and output connectors CNC-machined aluminum chassis Dual transparent top viewing panels Specs Inputs: USB, optical, coaxial Outputs: XLR, RCA XLR output level: 3.5Vrms RCA output level: 1.75Vrms THD+N: 0.003% (-90dB) Balanced measured THD+N: approximately 0.0025% XLR dynamic range: 107dB RCA dynamic range: 108dB XLR SNR: 107dB RCA SNR: 108dB Output impedance: 33 ohms USB bit depth: 1-bit DSD, 16 to 32-bit PCM Optical and coaxial bit depth: 1-bit DSD, 16 to 24-bit PCM USB PCM sampling rate: 44.1kHz to 768kHz USB DSD sampling rate: 2.8224MHz to 22.5792MHz USB DoP sampling rate: 2.8224MHz to 11.2896MHz Optical and coaxial PCM sampling rate: 44.1kHz to 192kHz Optical and coaxial DSD support: DSD64 DoP Windows compatibility: Windows 7, 8, 8.1, 10, and 11 — driver required Mac compatibility: macOS 10.6 or later — driverless Linux compatibility: Driverless Power consumption: 2.6W Standby power: less than 1W Dimensions: 6.69 x 1.57 x 5.35 in (170 x 39.8 x 136 mm) W x H x D Weight: 1.57 lb (712 g) AC input: 100–240V What’s included SMSL R100 R2R DAC