S.M.S.L SA400 High Power Amplifier

Safety Precautions

CAUTION: To reduce the risk of electric shock, do not remove the cover (or back). No user-serviceable parts inside. Refer servicing to qualified personnel.

Warnings:

• The lightning flash with arrowhead symbol ⚡ within an equilateral triangle warns of uninsulated "dangerous voltage" inside, posing a risk of electric shock.
• The exclamation point ⚠ within an equilateral triangle alerts users to important operating and maintenance instructions in the accompanying literature.
• Safe use is only permitted under an altitude of 2000m.

WARNING: To reduce the risk of fire or electric shock, do not expose this appliance to rain or moisture.

To completely disconnect the unit's power, unplug the power cord from the wall socket.

Features

• Dual STA516BE digital power amplifier chips, delivering 230W per channel at 4 ohms, easily driving most speakers.
• Utilizes NJRC's NJW1195 electronic volume control chip from Japan for precise volume control and low distortion.
• Features a super bass preamp output with adjustable range (-30dB to +10dB) for connecting active subwoofers to create a 2.1 audio system.
• Built-in multiple EQ modes and treble/bass adjustment for easy matching with various speakers and music genres.
• Equipped with a Qualcomm Bluetooth 5.0 receiver supporting APTX for enhanced sound quality and longer transmission distance.
• Constructed with an all-aluminum alloy CNC precision-processed shell, featuring anodizing technology and chamfering for exquisite workmanship and a premium feel.
• Includes a color LCD screen, a newly developed user interface, and a full-function remote control.
• Extensive use of audiophile-grade components to enhance subjective listening experience.
• High-quality gold-plated input and output terminals.
• Features robust protection circuits for overheating, overcurrent, and other issues.
• Incorporates a high-quality power supply specifically designed for audio applications.

Specifications

• Inputs: XLR, RCA, BT
• THD+N: 0.003%
• SNR: 96dB
• Channel Separation: 94dB
• Output Power: 230Wx2(4Ω) / 110Wx2(8Ω)
• Power Consumption: 50W (Normal Volume)
• Dimensions (WxHxD): 210x235x48mm
• Weight: 1.95 kg

Remote Control

Battery Installation: Install 2 x AAA batteries as instructed.

Operation:

• Point the remote towards the main unit's signal receiver from a distance of 5 meters (16 ft) or less.
• Ensure no obstructions are placed between the main unit and the remote.
• The remote may not function correctly if the receiver is exposed to direct sunlight or bright light. Try moving the unit to a different location.
• Be aware that this remote control might unintentionally operate other devices controlled by infrared signals.

Remote Buttons:

• ⚡ [Power ON/OFF]
• [Up]
• [Menu/OK]
• [Next Level Menu]
• [Return]
• [Down]
• [Input Select]
• [Mute] (Define in the menu)
• [Bluetooth (FN)]
• [Volume +]
• [Volume -]

Operating Range: Approximately 8 meters (26 ft).

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

Component Introduction

Main Unit Front

The front panel features:

• 1. [Multi-function knob]
• 2. [Display] screen
• 3. [Infrared Remote Receiver] window

Main Unit Back

The back panel includes:

• 4. [Bluetooth Antenna] connector
• 5. [XLR Input] connectors (Left and Right)
• 6. [Line In] (RCA) connectors
• 7. [SW OUT] (Subwoofer Output) connector
• 8. [Right Speaker Output] terminals
• 9. [Left Speaker Output] terminals
• 10. [Power Input] (100-240V AC)

Operation Instructions

Main Display and Settings

The main display shows:

• 1. Input selection indication (e.g., "Balanced")
• 2. Volume level (e.g., "12")
• 3. Input status (displays "MUTTING" when muted)

The settings menu has 8 pages:

• INPUT (Input Selection)
• EQ (Sound Effect Mode)
• BASS (Bass Adjustment)
• MIDDLE (Midrange Adjustment)
• TREBLE (Treble Adjustment)
• SUB WOOFER (Subwoofer Output Adjustment)
• BRIGHTNESS (Display Brightness)
• VERSION (Firmware Version)

INPUTS Menu:

• 1. BALANCED (Balanced Input)
• 2. UNBALANCED (Unbalanced Input)
• 3. BLUETOOTH (Bluetooth Input)

EQ Settings

The EQ menu offers several modes:

• 1. Direct (Bypass)
• 2. Tabebuia (Wind Chime)
• 3. Tone (Custom)
• 4. SDB (SMSL Patented Sound Effect)
• 5. Bass (Enhanced Bass Sound Effect)
• 6. Super Bass (Super Enhanced Bass Sound Effect)
• 7. Rock (Rock Music Sound Effect)
• 8. Soft (Soft Sound Effect)
• 9. Clear (Clear Sound Effect)

Bass Adjustment: Range is -12dB to +12dB. Adjusting Bass in Direct or other EQ modes automatically switches the EQ mode to "Tone".

Middle Adjustment: Range is -12dB to +12dB. Adjusting Middle in Direct or other EQ modes automatically switches the EQ mode to "Tone".

Treble Adjustment: Range is -12dB to +12dB. Adjusting Treble in Direct or other EQ modes automatically switches the EQ mode to "Tone".

SW OUT Adjustment: Range is -30dB to +7dB.

Brightness Adjustment: Level 1 to 6.

VERSIONS: Displays Hardware version (HW ver: 1.0) and Software version (SW ver: 1.0). Copyright © SMSL AUDIO 2020.

Bluetooth Operation

This product is equipped with Bluetooth functionality, accessible via the ⚙️ [FN button] on the remote.

• Short Press [FN button]: Switches directly to Bluetooth input. If Bluetooth connection is lost, it attempts to reconnect.
• Long Press [FN button]: Disconnects the current Bluetooth device and allows pairing with other devices.

Connection Process:

• Step 1: Switch the input source to Bluetooth via the SETTING MENU or by pressing the remote's [FN button].
• Step 2: On your mobile phone, enable Bluetooth, search for "SMSL BT5.0D", and tap to pair. The display "connected" confirms a successful connection.

Re-connection: If the Bluetooth connection is lost (e.g., after leaving and returning), some phones may not automatically reconnect. Press the remote's [FN button] to re-establish the connection.

Clearing Pairing / Connecting New Devices: Long press the remote's [FN button] to clear existing pairings. After clearing, some phones might not be able to find "SMSL BT5.0D". In such cases, delete the "SMSL BT5.0D" device from your phone's saved Bluetooth list, then search and pair again.

Factory Reset and Warranty Terms

Factory Reset

With the unit powered off, press and hold the power button. While holding the button, connect the power cord. Release the button once the screen displays the logo.

Warranty Terms

Term of Service: Foshan Shuangmusanlin Technology Co., Ltd. guarantees product quality. If the product fails within 7 days of purchase under normal use, customers may choose return, replacement, or repair (returns are only accepted if the product does not affect resale). Free repair is provided for one year under normal use.

Proof of Purchase: The date of purchase is determined by the seller's invoice or receipt. For online purchases, a screenshot of the transaction is acceptable.

Warranty Void Conditions: The warranty will be void under the following circumstances:

• All damages resulting from inappropriate use, including operation in non-normal working environments or failure to follow instructions.
• Unauthorized dismantling, modification, or repair by the user.
• Damage caused by using accessories not specified or accredited by the manufacturer.
• Damage or removal of the unit's QC or warranty sticker.
• Inability to provide credible proof of purchase.
• The product is not manufactured by the company.

Repair Method: Repairs are conducted via a send-in service.

Territorial Scope: These terms are applicable only to mainland China. For other regions, please refer to the regulations of local sales agents and national laws.