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3 Months old; bought new; Mint Condition; Thinning out my little collection: MINT CONDITION W/Factory Box and all accessories. Core Audio SpecificationsDAC Chip: Premium ESS ES9038Pro flag ship chip.USB Controller: XMOS XU208 processor.Decoding Support: Native DSD512 and PCM up to 32-bit / 768kHz via USB.Jitter Control: Upgraded with a custom CK-02 clock processing circuit for tighter timing accuracy.Total Harmonic Distortion: An ultra-low THD+N of 0.000065%.Dynamic Range: Strong performance metrics with 130dB via XLR and 123dB via RCA.Connectivity & FeaturesDigital Inputs: Includes USB Type-B, coaxial, optical, and high-res Bluetooth.Analog Outputs: Features balanced XLR and single-ended RCA outputs that can run simultaneously.Bluetooth Codecs: Supports high-fidelity LDAC (24-bit/96kHz), aptX-HD, aptX, AAC, and SBC.Pre-Amp Mode: Operates in either fixed DAC mode or a variable pre-amp mode to directly control active monitors or power amps.Sound Customization: Loaded with PCM filters and multiple "Sound Color" settings like Tube and Crystal modes
This is above market for the used SU-9n: at US$375, it sits well over the US$305 75th percentile and roughly US$141 above the median US$234, so I’d call it ambitious rather than a bargain.
That said, the SU-9n is a respected modern DAC if you want a clean, low-drama digital hub: it’s the kind of box people buy for solid measurements, balanced output, and a straightforward “set it and forget it” presentation. If the listing includes the remote, original packaging, and proof of careful ownership, that helps, but at this level I’d want strong condition and complete accessories to justify the premium.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
SMSL, founded in 2009 as Foshan ShuangMuSanLin Technology Co., Ltd. in Shenzhen, China, emerged from the country's burgeoning tech hub to specialize in digital audio innovation. The company quickly expanded with a Hong Kong branch, VMV Technology, in 2013, targeting higher-end exports and establishing a global footprint across more than 30 countries. Its early focus on domestic sales laid a solid foundation, evolving into a recognized name in affordable hi-fi.
The brand excels in digital-to-analog converters (DACs), headphone amplifiers, and power amplifiers, delivering high-performance components like the iconic Sanskrit series—featuring DACs, preamp-capable headphone amps, and linear power supplies. SMSL emphasizes in-house R&D for stylish, well-built devices incorporating premium technologies such as THX AAA-888 amplification, prioritizing audio fidelity without unnecessary frills.
Positioned as a mid-tier leader in the value-driven hi-fi market, SMSL earns praise for punching above its weight, offering audiophile-grade sound at accessible prices that rival pricier competitors. Popular among discerning buyers seeking reliability and transparency, it stands out for meticulous component selection, though some note occasional quality concerns with budget imports. For the knowledgeable enthusiast, SMSL represents smart, modern Chinese engineering at its finest.
See all SMSL listings on RADAR.
