The SMSL SU-9 Pro is a desktop DAC built on the ESS ES9039MSPRO with up to 11 OPA1612A op-amps, an XMOS XU-316 USB interface for PCM up to 32-bit/768kHz and DSD512, Bluetooth with LDAC, and XLR and RCA outputs. It suits balanced desktop or living-room systems feeding powered speakers, a preamp or a power amp.
Who the SMSL SU-9 Pro is for
Hi-res file playback: The XMOS XU-316 USB input handles PCM up to 32-bit/768kHz and native DSD512, with MQA decoding on USB, optical and coaxial.
Balanced systems: XLR outputs deliver 5.2Vrms and RCA 2.5Vrms, with SNR rated 134dB on XLR and 128dB on RCA.
Phone streaming: Bluetooth 5.0 receives LDAC up to 24-bit/96kHz, plus aptX HD, aptX, AAC and SBC.
Active speakers or power amps: Pre mode sets the outputs to variable, remote-controlled volume or to a fixed maximum level.
Skip it if: You need a headphone output: the SU-9 Pro has XLR and RCA line outputs only, and Windows needs SMSL's USB driver.
SMSL SU-9 Pro key specs
DAC chip and op-amps: ESS ES9039MSPRO; up to 11 OPA1612A
USB: XMOS XU-316 (USB-B); PCM up to 32-bit/768kHz; DSD512; DoP256
Optical/coaxial: PCM up to 24-bit/192kHz; DoP64
MQA: MQA decoding on USB, optical and coaxial; MQA-CD on optical and coaxial
Display and control: 1.9-inch LCD, volume knob, full-function IR remote (2 x AAA); PCM/DSD filters, 9 sound-color presets
Power: Built-in supply with discrete linear regulators, 100–240V AC 50–60Hz; under 10W
Size and weight: 187.5 × 154 × 40mm; 0.79kg (1.74lb)
Genuine SMSL stock. Free shipping on every order, 45-day returns.
SMSL SU-9 Pro vs similar options
vs SMSL DO400: Adds a 3,000mW x 2 @ 32Ω headphone amp plus AES/EBU and I2S inputs around the same ES9039MSPRO chip; pick the SU-9 Pro for a line-level DAC in a smaller 187.5 × 154 × 40mm case.
vs SMSL D400 Pro: Swaps in AKM's AK4191 + AK4499EX split architecture with the same XU316, 32-bit/768kHz, DSD512, MQA-CD and remote; pick the SU-9 Pro if you prefer ESS's ES9039MSPRO.
Yes. Every unit we sell is genuine and brand-new, shipped in its original packaging, and backed by our 1-year TonePier warranty and 45-day returns.
Where does my order ship from, and how long does it take?
Every order ships from our warehouse in China, with full tracking, and most orders ship within 3 business days. Shipping is free on every order; most US orders arrive within 7–15 business days and most orders to other countries within 7–20 business days — see our shipping policy for details.
What if it isn't for me?
You get 45 days to decide. Keep the packaging, keep it in like-new condition, and send it back for a refund. Ear tips unsealed for hygiene reasons are fine — we expect you to actually listen.
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