S.M.S.L SU-X USER MANUAL

Safety Notes

• Install this unit in a well-ventilated, cool, dry, clean place, away from direct sunlight, heat sources, vibration, dust, moisture, or cold.
• Use only the voltage specified on this unit. Using this unit with a higher voltage than specified is dangerous and may cause fire, damage to this unit, or personal injury. The company will not be held responsible for any damage resulting from the use of this unit with a voltage other than that specified.
• Do not attempt to modify or fix this unit yourself. Contact a salesperson or customer service when any service is needed. The cabinet should never be opened for any reason.
• When not planning to use this unit for long periods of time (e.g., when going on vacation), disconnect the power cable from the AC wall outlet.

Important note: The product specifications and information mentioned in this manual are for reference only. The content of this manual is subject to change without notice.

Warranty Terms

1. Term of Service: Foshan Shuangmusanlin Technology Co., Ltd. promises to offer good-quality products. If the product is broken within 7 days after purchasing when used normally, customers can choose return, replacement, or repair (only products that do not affect second sales can be returned). Free repair is provided for one year if used normally.

2. Date of Purchase: The date of purchase is determined by the invoice or receipt issued by the seller. For online purchases, a screenshot of the transaction can be provided.

3. Warranty Void Conditions: If inappropriate usage causes damage to the unit, the warranty will be void. This includes:

• All damages due to inappropriate use, including use in a non-normal working environment or without following instructions.
• Dismantling, refitting, or repairing by the user privately.
• Damage caused by using fittings other than the designated or accredited ones.
• Inability to provide credible proof of purchase.
• Sending the unit back for repair without proper authorization.
• The product not belonging to the company.

4. Warranty Method: Return to the company for repair. This clause is only applicable to mainland China. For other regions, please refer to the regulations of the local sales agent and national laws.

Features

• Supports MQA decoding and MQA-CD.
• Features the brand-new third-generation XMOS XU-316, supporting PCM up to 32bit/768kHz and DSD up to DSD512.
• Utilizes two groups of linear power supplies for digital and analog units, respectively, complemented by multiple low-noise regulated power supplies for a stable, reliable, efficient, and low-noise power supply system for the SU-X.
• Employs dual latest flagship DAC chips, ESS ES9039MSPRO, with built-in MQA decoding.
• Designed with an eight-channel parallel circuit for exceptionally low distortion, as low as 0.00005% (-126dB), ensuring enhanced stability.
• Incorporates 21 high-end dual op-amps and a large number of HiFi components.
• Adopts 2nd PLL to eliminate SPDIF transmission JITTER.
• Features a brand-new self-developed CK-03 clock processing circuit that greatly reduces clock jitter.
• Supports DOP independent display for clearly viewing the current decoding format.
• USB, optical, coaxial, AES, and I2S support DSD, while coaxial, optical, and AES also support DOP64.
• Uses tempered glass for a full-fit color IPS display screen.
• Includes built-in low-noise power supply processing to improve power efficiency and lower power consumption.
• Equipped with Qualcomm's high-end Bluetooth chip, supporting LDAC (24bit/96kHz), APTX/HD, SBC, and AAC.
• Features a high-quality all-aluminum shell.
• Includes high-quality gold-plated input and output terminals.
• Holds Japan Audio Association (JAS) Hi-Res certification.
• Comes equipped with a remote control for full-function operation.

Specifications

S.M.S.L reserves the right to make improvements which may result in specification or feature changes without notice.

Component Introduction

The SU-X unit features various input and output ports, a display, and a control knob. The rear panel includes:

• AC IN (Power Input)
• USB-B Input
• USB-C Input
• Optical Input
• Coaxial Input
• I2S Input
• AES/EBU Input
• XLR Output (Balanced)
• RCA Output (Unbalanced)
• Bluetooth Antenna

The front panel features:

• Knob: Controls volume, menu switching, and function selection. A short press enters the menu and confirms selections; a long press exits the menu and powers the unit on/off.
• Display: Shows current status and settings.
• Remote Window: For the infrared remote control.
• Standby LED

Function Introduction

Inputs (Input Methods)

• USB TYPE B (USB Input)
• USB TYPE C (USB Input)
• BLUETOOTH (Bluetooth Input)
• OPTICAL (Optical Input)
• COAXIAL (Coaxial Input)
• AES/EBU (AES/EBU Input)
• I2S(HDMI) (I2S Input)

Outputs (Output Methods)

• ALL LINE OUT (All Outputs)
• BALANCED (Balanced Output)
• UNBALANCED (Unbalanced Output)

PCM FILTER (PCM Filters)

• FILTER OFF (Filter disabled, NOS mode)
• MINIMUM PHASE (Minimum Phase)
• APODIZING (Apodizing, fast roll-off, linear phase filter)
• LINEAR FAST (Linear Fast, fast roll-off, linear phase filter)
• LINEAR SLOW (Linear Slow, slow roll-off, linear phase filter)
• MINIMUM FAST (Minimum Fast, fast roll-off, minimum phase filter)
• MINIMUM SLOW (Minimum Slow, slow roll-off, minimum phase filter)
• LOW DISPERSION (Low Dispersion, low delay)

DSD FILTER (DSD Filters)

• 47k CUT-OFF (47kHz frequency cutoff)
• 50k CUT-OFF (50kHz frequency cutoff)
• 60k CUT-OFF (60kHz frequency cutoff)
• 70k CUT-OFF (70kHz frequency cutoff)

PRE MODE (Preamplifier Mode)

PRE MODE is the volume adjustment function switch for the output.

• VARIABLE: The output volume is controlled by the unit.
• FIXED: The output volume is fixed.

SOUND COLOR (Sound Color Settings)

The SU-X offers 9 sound color settings, achieved through DAC internal DSP processing:

• Rich1, Rich2, Rich3 (Rich overtone)
• Tube1, Tube2, Tube3 (Tube sound character)
• Crystal1, Crystal2, Crystal3 (High-definition clarity)

These settings alter the sound character without changing the frequency response curve. Setting to "Standard" bypasses these functions.

FN KEY FOR (FN Key Functionality)

• OUTPUTS (Output Selection)
• BLUETOOTH (Switch to Bluetooth Input)

DPLL (DPLL Setting)

The DPLL setting adjusts the internal DPLL digital phase-locked loop circuit bandwidth to balance anti-clock jitter and input tolerance. It offers 15 levels (default is 7). A higher number increases adaptability to jitter, while a lower number improves performance against clock jitter.

Functionality:

• When the input signal's clock stability is good, reducing this value can enhance system clock performance.
• When the input signal's clock stability is poor, the sound may be interrupted. Increasing this value can prevent sound interruptions, especially when using TV as a signal source.

I2S MODE (I2S Mode)

This option matches different I2S interface standards. Please check the interface definition of the signal source before use.

• NORMAL: PS AUDIO format.
• REVERSED: DATA and LRCK are inverted.

Diagrams showing I2S pinouts for NORMAL and REVERSED modes are provided, illustrating pin assignments for BCK, MCLK, DATA, LRCLK, GND, MUTE, DSD FLAG, and NC.

DIMMER (Screen Dimmer)

Sets the auto screen-off time from 5 seconds to 60 seconds. After the set time, the screen will automatically turn off. The screen will re-light up upon any operation of the remote control or the knob. This feature helps reduce light pollution and enhance the listening environment.

BRIGHTNESS (Display Brightness)

Adjustable from 1% to 99%.

RESET (System Reset)

• During Bluetooth input, long-pressing the middle button of the knob will only reset the Bluetooth pairing status.
• During other inputs, long-pressing the middle button of the knob will clear all settings, including Bluetooth pairing.

About MQA

MQA (Master Quality Authenticated) is an award-winning British technology that delivers the sound of the original master recording. The master MQA file is fully authenticated and is small enough to stream or download. The SU-X includes MQA technology, which enables playback of MQA audio files and streams, delivering the sound of the original master recording.

For more information, visit: https://www.mqa.co.uk/how-it-works

How to Play MQA

• The SU-X supports MQA decoding via USB, optical fiber, and coaxial inputs.
• SU-X's MQA playback does not require special playback software. Software supporting ASIO or WASAPI audio output (e.g., foobar2000, Audirvanaplus) is sufficient. It is recommended to set the computer's volume to maximum when playing MQA audio for optimal output.
• When playing an MQA file, the sampling rate of the original master recording is displayed.

MQA and the Sound Wave Device are registered trademarks of MQA Limited. © 2016

Notes on Playing MQA-CD

• Please ensure that the disc being played is a genuine MQA-CD.
• Verify that the optical or coaxial signal output from the CD player is unprocessed source code.

Remote Control

Notes:

• If the remote control is ineffective even when close to the unit, replace the battery with a new one.
• If the remote control will not be used for a long time, remove its battery.
• Dispose of used batteries in accordance with local regulations.

Operating the Remote Control

The remote control features the following buttons:

• Power ON/OFF ?
• Up
• MENU/OK
• Right
• Left
• Down
• Input select
• Mute ?
• FN (Define in the menu)
• Volume + ➕
• Volume - ➖

Note: This remote controller uses 2 x R03/AAA batteries.