S.M.S.L AO200 MKII Digital Power Amplifier

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 a higher voltage is dangerous and may cause fire, damage to the unit, or personal injury. The company is not responsible for any damage resulting from the use of a voltage other than that specified.
• Do not attempt to modify or fix this unit yourself. Contact a salesperson or customer service for any service needs. The cabinet should never be opened for any reason.
• When not planning to use the unit for extended periods (e.g., during 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

Foshan Shuangmusanlin Technology Co., Ltd. promises to offer good-quality products. If the product is broken within 7 days of purchase under normal use, customers can choose to return, replace, or repair it (returns are only accepted if the product does not affect second sales). For failures occurring within one year of normal use, free repair will be provided.

The date of purchase is based on the invoice or receipt issued by the seller. For online purchases, a screenshot of the transaction may be used as proof.

The following situations are not covered by the "return, exchange, repair" services:

• Damage caused by factors other than normal operating conditions, such as use in non-normal environments or failure to follow instructions.
• Damage from private dismantling, modification, or repair by the user.
• Damage caused by using non-specified or unauthorized accessories.
• Damage to the unit's QC seal or warranty sticker.
• Failure to provide valid proof of purchase.
• Items not belonging to the company's products.

Warranty service is typically handled via shipment. For other regions, please refer to the regulations of your local dealer and national laws.

Features

• Features two German Infineon new technology class D power amplifier chips, offering higher quality, up to 92% efficiency, and reduced power consumption.
• Utilizes Japan's NJRC electronic volume control chip NJW1194 for precise volume control and low distortion.
• Balanced design from input to speaker output significantly reduces distortion caused by signal transmission.
• Built-in SMSL SDB patented sound and treble/bass adjustment for easy matching with various speakers and music genres.
• Subwoofer pre-out for 2.1 system applications.
• New Bluetooth 5.0 reception provides better sound quality and longer transmission distance.
• All-aluminum alloy CNC precision-processed shell with anodizing technology and chamfering process, ensuring exquisite workmanship and a delicate touch.
• Color LCD display and user-friendly operating system are simple and easy to understand, equipped with a full-featured remote control.
• Low power standby function meets the latest European ErP2 standard.
• A large number of professional Hi-Fi audio components are used to enhance the listening experience.
• High-quality gold-plated input and output terminals.
• Comprehensive protection circuits for overheating, overcurrent, etc.
• Built-in high-quality power supply, specially designed for audio.

Specifications

Specifications are subject to change without notice.

Remote Control

Operation:

• Install 2 x AAA batteries as instructed.
• When using the remote control, point it towards the remote control signal receiver on the main unit from a distance of 5 m (16 ft) or less. Do not place obstructions between the main unit and the remote control.
• The remote control might not work if the signal receiver on the unit is exposed to direct sunlight or bright light. Try moving the unit if this occurs.
• Be aware that using this remote control could cause unintentional operation of other devices controlled by infrared signals.

Operating the Remote Control:

• Power ON/OFF: Press the power button.
• Up: Navigate up in menus.
• MENU/OK: Enter menu or confirm selection.
• Next level menu: Access sub-menus.
• Return: Go back to the previous menu.
• Down: Navigate down in menus.
• Input select: Choose the input source.
• Mute: Mute audio output (defined in the menu).
• FN: Function button.
• Volume +: Increase volume.
• Volume -: Decrease volume.

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

Display Interface and Instructions

The unit features a front panel with a display screen, a control knob, and an infrared receiver.

Front Panel Components:

• 1. Display: Shows current status, settings, and input source.
• 2. IR Receiver Window: Receives signals from the remote control.
• 3. Knob: Used for navigation and selection within menus, and for volume control.

Rear Panel Components:

• 4. XLR Input (Balanced): Left channel balanced audio input.
• 5. RCA Input (Unbalanced): Left and Right channel unbalanced audio inputs.
• 6. Subwoofer Output: Pre-out for connecting a subwoofer.
• 7. USB Input: For digital audio connection from a computer or other USB devices.
• 8. Bluetooth Antenna: For Bluetooth wireless connectivity.
• 9. Right Channel Output: Speaker output terminals for the right channel.
• 10. Left Channel Output: Speaker output terminals for the left channel.
• 11. Power Input: Connection for the AC power cord.
• 12. Power Switch: Main power on/off switch.

Note: When connecting speakers, pay attention to the polarity markings on the unit to avoid affecting sound quality.

Menu Navigation and Settings:

The unit has 6 pages of settings accessible via the menu:

Settings Menu Options:

• INPUT: Selects the audio input source (USB, BALANCED, UNBALANCED, BLUETOOTH).
• EQ: Selects the sound effect mode. Options include Direct (bypass), Tone (custom), SDB (SMSL patented sound), Bass (bass boost), Super Bass (enhanced bass), Rock, Soft, and Clear.
• BASS: Adjusts the bass level (-10dB to +10dB). Changing Bass or Treble when EQ is in Direct or another mode will automatically switch the EQ to Tone mode.
• TREBLE: Adjusts the treble level (-10dB to +10dB).
• DIMMER: Sets the screen auto-off timer (5 seconds to 60 seconds). The screen will turn off after the set time but will re-illuminate upon any knob or remote operation.
• BRIGHTNESS: Adjusts the display brightness level (LEVEL 1-6).

Input Menu:

• USB
• BALANCED (XLR input)
• UNBALANCED (RCA input)
• BLUETOOTH (Wireless input)

EQ Menu:

• Direct (Bypass)
• Tone (Custom EQ)
• SDB (SMSL patented sound effect)
• Bass (Bass-boosted sound effect)
• Super Bass (Enhanced bass sound effect)
• Rock (Rock music sound effect)
• Soft (Gentle sound effect)
• Clear (Clear sound effect)

Bluetooth Operation Instructions

• Connection: Switch the input source to Bluetooth in the SETTING MENU or press the Bluetooth button on the remote. Turn on your mobile phone's Bluetooth function, search for "AO200MKII", and tap to pair. Connection is successful when the phone displays "connected".
• Re-connection: If the connection is lost (e.g., after returning home), some phones may not automatically reconnect. In this case, briefly press the Bluetooth button (FN) on the remote to re-establish the connection.
• Connecting New Devices: Long-press the Bluetooth button (FN) on the remote control. After clearing the pairing, some phones may no longer be able to search for "AO200MKII". If this happens, delete the "AO200MKII" Bluetooth device saved on your phone and then search and pair again.

Factory Reset

With the unit powered off, press and hold the power button, then turn on the power. Release the button once the screen displays the logo. The unit will then restart.

Package List

• 1 x S.M.S.L AO200 MKII unit
• 1 x AC power cord
• 1 x Bluetooth antenna
• 1 x Remote control
• 1 x User manual
• 1 x Warranty card