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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.
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.
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.
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.
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.
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.
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 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.
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.
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.
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.
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