S.M.S.L DO300 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 the voltage specified on this unit Only. 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 by 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, you can choose to send it back for return, replacement, or repairing (only the product that does not affect second sales can be returned). Repairing for free within one year if used normally.

2. Date of Purchase: In accordance with the date on the invoice or receipt issued by the seller. For online purchases, a screenshot of the transaction can be shown.

3. Warranty Void Conditions: If inappropriate usage causes the unit damage, 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.
• Causing damage by using fittings other than the designated or accredited ones.
• Inability to provide credible proof of purchase.

4. Repair Process: Send the unit back to the company for repairing.

5. Contact: Contact your S.M.S.L Audio reseller for a return or replacement.

Features

• Supports MQA decoding and MQA-CD.
• New 3rd generation XMOS XU-316, PCM support up to 32bit/768kHz, DSD support up to DSD512.
• New generation flagship DAC chip ES9039MSPRO from ESS (USA) with built-in MQA hard decoding.
• Designed with an eight-channel parallel circuit, achieving distortion as low as 0.00005% (-125dB) and enhanced stability.
• Uses 11 high-end dual op amps and a large number of audiophile-grade components.
• Adopts 2nd PLL to eliminate JITTER during SPDIF transmission.
• Features a newly self-developed CK-03 clock processing circuit to greatly reduce clock jitter.
• Supports DOP independent display function for accurate determination of the current decoding format.
• USB, optical fiber, coaxial, and AES, I2S support DSD transmission; coaxial and optical fiber support DOP64.
• Uses tempered glass for a full-fit color IPS display.
• Built-in low-noise power processing enhances power efficiency and lowers power consumption.
• Combined with multiple low-noise regulated power supplies for a stable, reliable, efficient, and low-noise power supply system.
• Qualcomm high-end Bluetooth chip, supporting LDAC (24bit/96kHz), APTX/HD, SBC, AAC.
• High-quality all-aluminum alloy shell with high-quality gold-plated input and output connection terminals.
• Certified by the Japan Audio Association (JAS) for Hi-Res audio.
• Equipped with a full-featured remote control.

Specifications

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

Display Interface and Instructions

The front panel features a central knob (1) for control, a remote window (2) for the infrared receiver, and a display screen (3).

The rear panel includes various audio and power connections:

• 4. RCA output: Single-ended line output.
• 5. Bluetooth antenna: For wireless connectivity.
• 6. Optical input: For digital audio input.
• 7. Balanced output: XLR line output.
• 8. AES/EBU input: Digital audio input.
• 9. I2S input: Digital audio input, often via HDMI connector.
• 10. Coaxial input: Digital audio input.
• 11. USB input: For connecting to computers or other USB sources.
• 12. AC IN (100-240VAC): Power input.
• 13. Power switch: Main power on/off.

Package List

• 1 x S.M.S.L DO300 unit
• 1 x USB cable
• 1 x Warranty card
• 1 x Remote control
• 1 x AC power cable
• 1 x Bluetooth antenna
• 1 x User manual

Instructions

INPUTS (Input Methods)

• USB: (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: (NOS filter off)
• MINIMUM PHASE: (Minimum phase)
• APODIZING: (Cut-off, fast roll-off, linear phase filter)
• LINEAR FAST: (Fast roll-off, linear phase filter)
• LINEAR SLOW: (Slow roll-off, linear phase filter)
• MINIMUM FAST: (Fast roll-off, minimum phase filter)
• MINIMUM SLOW: (Slow roll-off, minimum phase filter)
• LOW DISPERSION: (Low dispersion 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)

SOUND COLOR (Tone Menu)

The unit features 9 sound color modes processed by the DAC's DSP:

• Rich1, Rich2, Rich3: (Rich harmonics)
• Tube1, Tube2, Tube3: (Tube sound)
• Crystal1, Crystal2, Crystal3: (High clarity)

These settings use the DAC's internal DSP to create different sound color effects. All settings do not alter the frequency response curve. Setting to "Standard" mode will bypass this function.

PRE MODE (Preamplifier Mode)

PRE MODE is the volume adjustment function switch for the output interface:

• VARIABLE: The output interface volume is controlled.
• FIXED: The output interface volume is fixed.

DPLL (DPLL Settings)

MIN ~ MAX: (Total of 15 levels, default is 7. Higher numbers offer stronger jitter adaptation range; lower numbers provide better performance against clock jitter.)

This DPLL setting is a special function of ESS series products. It adjusts the internal DPLL digital phase-locked loop circuit's bandwidth, balancing anti-clock jitter and input tolerance.

Functionality:

• When the input signal's clock stability is good, reducing this value can improve system clock performance.
• If the input signal's clock stability is poor, causing sound interruptions, increasing this value can prevent interruptions, especially when using TV as a signal source.

FN KEY FOR (FN Button Function)

• OUTPUTS: (Output selection)
• BLUETOOTH: (Switch to Bluetooth input)
• PHASE: (Switch output phase)

I2S MODE (I2S Mode)

• NORMAL: (Normal, PS AUDIO format)
• REVERSED: (Inverted, DATA and LRCK inverted)

Diagram Description: The diagrams illustrate the pinouts for I2S connections. The 'NORMAL' diagram shows standard pin assignments for GND, BCK, MCLK, DATA, LRCLK, NC, and DSD FLAG. The 'REVERSED' diagram indicates inversions or alternative assignments for DATA and LRCK pins. Note: This option is used to match different I2S interface standards; check the signal source's interface definition before use.

AUDIO PHASE

• NORMAL: (2+, 3-)
• INVERTED: (2-, 3+)

Diagram Description: The diagrams show audio phase connections. The 'NORMAL' diagram indicates connections at 2+ and 3-. The 'INVERTED' diagram indicates connections at 2- and 3+.

DIMMER (Automatic Screen Off)

Setting: 5 seconds ~ 60 seconds. After setting, the screen will automatically turn off within this time. The screen will relight if the remote control or the knob is operated at any time. This greatly reduces light pollution and enhances the listening environment comfort!

BRIGHTNESS (Display Brightness Setting)

• LEVEL 1 ~ LEVEL 6

RESET (System Reset)

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

Remote Control

If the remote control is still ineffective when close to the machine, replace it with a new battery.

If the remote control is not used for a long time, remove the battery.

Dispose of used batteries in accordance with local regulations on battery disposal.

Operating the remote control

The remote control has the following functions:

• Power ON/OFF
• Up (Navigate menus)
• MENU/OK (Access menu / Confirm)
• Next level menu
• Return (Go back)
• Down (Navigate menus)
• Input select
• Mute
• FN (Function key, defined in the menu)
• Volume +
• Volume -

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