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SMSL SU-9 Open-Box

SMSL SU-9 Open-Box

Open Box More information
Open box items are final sale.
Regular price $399.99
Sale price $399.99 Regular price $459.99

Connectivity More information
Connectivity refers to the method in which the headphones connect to the audio source. Headphones can be either wired or wireless.


Portability More information
DACs and amplifiers can either be carried around or meant for static desktop use

Not Portable

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SMSL SU-9 Open-Box

Regular price $399.99
Sale price $399.99 Regular price $459.99

Flagship ES9038PRO DAC

The SU-9 features the ES9038PRO SABRE DACs, the vanguard of decoder technology, touting the industry’s highest dynamic range (DNR) of 132db in a 32-bit, 8-channel DAC. It decodes 32-bit/768kHz PCM and native DSD512.

Top-of-the-line THD+N 

With a total harmonic distortion plus noise (THD+N) rating of 0.00009%, the SU-9 vaults music above a dizzingly low noise floor, resulting in perfect transparency. 

MQA Decoding

Did you know that MP3 files deliver just 10% of original studio recordings? That’s one-tenth of the nuance, depth, and richness that the artist intended for you to hear. MQA (Master Quality Authenticated) files, on the other hand, deliver the full, uncompressed sound of the original master recordings in all their richness. The SU-9 features full MQA-decoding, delivering the best possible version of your music. 

State-of-the-Art Bluetooth

Ditch the wires; keep the quality. Boasting Bluetooth 5.0, the SU-9 supports 24-bit transmission of lossless codecs (AAC, SBC, aptX, aptX LL, aptX HD, and LDAC). 

Full-Featured Remote Control

Take a load off. The SU-9 comes with a full-featured remote control, letting you control the volume, brightness, and a host of other features from the comfort of your couch. 

Sound Signature Customization With DAC Filters

The SU-9 features a slew of digital filters, sound color settings, and brightness controls to enhance the way music sounds. Sound color settings include: Rich, Tube, and Crystal. DSD filters include cutoffs at 47kHz, 50kHz, 60kHz, and 70kHz. PCM filters include: fast linear, slow linear, fast minimum, slow minimum, fast hybrid, apodizing, and brick wall. 


  • MQA decoding: Yes

  • DAC: Flagship ES9038PRO DAC

  • Highest Bitrate Support: 32-bit/768kHz and DSD512

  • Bluetooth Codecs: LDAC, APTX/ HD, SBC, AAC, 24-bit/192kHz

  • Display: 1.9” LCD display

  • Remote control: Yes

  • Inputs: USB/optical/coax/bluetooth

  • Outputs: RCA/XLR

  • THD+N: 0.00009% 

  • DNR

    • XLR: 130dB

    • RCA: 123dB

  • SNR: 130dB

  • Output impedance

    • XLR: 207Ω

    • RCA: 142Ω

  • Sound color settings: Rich1, Rich2, Rich3, Tube1, Tube2, Tube3, Crystal1, Crystal2, Crystal3

  • Brightness control: 1-6 levels

  • DSD filters: 47kHz cutoff, 50kHz cutoff, 60kHz cutoff, 70kHz cutoff

  • PCM filters: fast linear, slow linear, fast minimum, slow minimum, fast hybrid, apodizing, brickwall