Choose the best possible connection cable type and connect it to your TV.*
Bottom of Sound Bar
Connect the power cable to the sound bar AC IN as shown.
Plug the power cable into an electrical outlet.
Remove the battery cover by gently sliding it away from the remote.
Insert the included batteries and gently slide the battery cover back into place.
When needed, VIZIO recommends replacing the batteries that came with this remote with two, new Duracell ‘AAA’ alkaline batteries.
After turning on both your TV and sound bar, it will automatically begin searching for an active input.* The LED indicator on the front of the sound bar will begin cycling in different colors through inputs until an audio source is detected.**
Tip: Pressing the INPUT button will stop the auto detect function.
You can press the INPUT button to switch between audio sources. For example, if you connected your TV to AUX, set the sound bar to AUX.
*Occurs only during first-time set up.
**Auto detect function only occurs once when the sound bar is first powered on. To enable this feature again, you must do a Factory Reset (see the Using Button Combinations section for more information) or press and hold the INPUT button for 3 seconds.
For the best surround sound experience, position the sound bar as shown.
The sound bar should be close to ear level (approx. 2-3 ft. off the floor).
Input
Press the INPUT button on the remote to cycle through the available inputs. Press and hold the INPUT button for 3 seconds to enable the auto input detect function.Specific inputs will show a different LED color:
• AUX In: Green
• AUX VA: Violet
• Digital Optical: Red
• HDMI In: Yellow
• HDMI ARC: Magenta
• Bluetooth: Blue
• USB: Orange
Bluetooth Pairing
Press and hold the 
button on the remote. The sound bar will be discoverable for 15 minutes. You can now search for the sound bar (VIZIO M21d) using your Bluetooth Device. The sound bar will power down if no device is found.
Note: Set your Bluetooth device into pairing mode prior to the sound bar.
DTS Virtual: X
Press the VRT: X button to enable/disable Virtual: X. When ON, all inputs will produce a virtual sound technology that simulates the effect of having overhead sound. When OFF, all sources will play back in stereo.
DTS TruVolume
Press the TVOL button to enable/disable TruVolume. When ON, TruVolume provides a consistent and comfortable volume level for a more enjoyable listening experience.
Equalizer Mode
Press the EQ button to toggle between four preset equalizer settings: Music, Movie, Game, Dialogue.
Note: Movie mode is on by default.
Bass Level
Press the BASS button and then use the Next/Previous buttons to increase/decrease the bass level. The LED indicators will move to the right with increasing levels and down with decreasing levels. Decreasing the bass level to the lowest setting will reduce bass and subwoofer levels on the bar. This is best for watching TV late at night in a quiet environment.
Treble Level
Press the TREB button and then use the Next/Previous buttons to increase/decrease the treble level. The LED indicators will move to the right with increasing levels and down with decreasing levels.
Night Mode
Press the NIGHT button and then use the Next/Previous buttons to enable/disable Night Mode. When enabled (On), the sound bar will lower bass frequency levels to provide a more quiet environment (ideal for apartment living and homes with sleeping children).
Auto VA
Press and hold the INPUT button on the remote for 10 seconds to enable/disable AUX VA.
—or—
Press and hold the Bluetooth button on the remote for 10 seconds to enable/disable Voice Assistant Bluetooth (BT). Refer to Connecting to a Voice Assistant on page 19 for more information.
Dolby Audio or DTS signal
Dolby Audio and DTS are available on the HDMI ARC, HDMI In, and Digital Optical audio inputs. When a Dolby Audio or DTS signal is detected, the LED will light up for 5 seconds before fading away
There are other functions that are triggered by different button combinations on the sound bar.
Buttons are located here. 
Factory Reset
Reset the sound bar to the factory default settings. To perform a Factory Reset, Press and hold the Bluetooth button 
and Volume Down (—) buttons for 5 seconds. Note: This will erase all settings and preferences that you have set.
VIZIO TV Remote Control
Enable/disable the use of a VIZIO TV remote control to power on and adjust the volume of the sound bar. To enable/disable this function, Press and hold the Power (
) and Volume Up ( + ) buttons for 5 seconds.
Eco Power Mode
When the Eco Power Mode setting is enabled, the sound bar will automatically power down after a period of inactivity. When disabled, the sound bar will remain powered on until you turn it off. To enable/disable this function, Press and hold the Power () and Volume Down (—) buttons for 5 seconds.
Note: Eco Power mode is disabled by default.
You can program your sound bar to accept TV remote IR commands.
Learn Volume Down
Press the OK and Volume Down buttons at the same time to put the sound bar into learning mode. While the sound bar is in learning mode, press the Volume Down button on the TV remote control.
Learn Volume Up
Press the OK and Volume Up buttons at the same time to put the sound bar into learning mode. While the sound bar is in learning mode, press the Volume Up button on the TV remote control.
Learn Mute
Press the OK and Volume Mute buttons at the same time to put the sound bar into learning mode. While the sound bar is in learning mode, press the Mute button on the TV remote control.
Point both the sound bar and TV remotes towards the front of the sound bar when programming. 
Turn off your TV speakers when programming your sound bar.
To pair the sound bar with a Bluetooth device:
1. Press and hold the Bluetooth button 
on the sound bar or remote for five (5) seconds.
2. Search for the sound bar (VIZIO M21d) using your Bluetooth device. For more information, refer to the user documentation that came with the device.
3. Now you can play audio from your Bluetooth device. Volume can be controlled on both your source device and the sound bar.
In Bluetooth pairing mode, the LED indicators on the display panel on the front of the sound bar will light up from left to right continuously. Once the device is paired, the LED indicators will stop flashing.
1. Your sound bar supports music streaming from devices with Bluetooth capability. (Device compatibility will vary, see your device’s documentation for more information.)
2. Once you have paired your source device to the sound bar your device should remain paired. (within range)
3. If the source is changed back to Bluetooth, any paired Bluetooth device will reconnect automatically.
4. If the input is changed, the Bluetooth device will disconnect (will stay connected if Auto VA BT is on).
Maximizing Signal
A Bluetooth signal has a range of up to 30 feet. Keep in mind that Bluetooth is a compressed audio format, so streamed music may lose some integrity when compared to a wired connection.
Try the following if your sound quality is less than optimal:
Your sound bar is not equipped with a microphone, so it cannot operate as a hands-free device for a smartphone.
Reduce the volume levels on your device and on the sound bar before pressing Play. High volume levels can damage your hearing.
Your sound bar can connect to a Voice Assistant (VA) device through an AUX VA or Bluetooth connection. Once connected, your sound bar will now act as the VA speaker.
Features and Benefits:
Make sure your sound bar is turned ON and Eco Power setting is turned OFF. Refer to Eco Power mode on page 15 to disable.
Setup Tips:
Using the AUX VA Port to Connect
Use a 3.5mm audio cable to connect the AUX VA port on the sound bar to an AUX port on your voice assistant device. If there is no AUX port on the VA device, use a Bluetooth connection instead.
Benefits of this type of connection:
Simple and easy connection setup.
Using Bluetooth to Connect
Press and hold the Bluetooth button on the sound bar or remote for five (5) seconds. Search for the sound bar (VIZIO M21d) using your VA device app. For more information, refer to the user documentation that came with the device.
Benefits of this type of connection:
What is HDMI Audio Return Channel (ARC)?
To connect using HDMI* :
1. Connect one end of the HDMI cable to the HDMI 1 (ARC) port on the back of your TV.
2. Connect the other end to the HDMI (ARC) port on your sound bar.
3. From the AUDIO menu on your TV, change the Digital Audio Setting to Dolby Digital or Bitstream.
4. From the SYSTEM menu, enable CEC and ARC (SAC)† functions.
5. From the CEC menu, select Device Discovery to register the sound bar with the TV.
If you want to use the TV remote to control the sound bar volume: Enable System Audio Control from the CEC menu.
* The following steps are for use with a VIZIO TV, steps may differ by TV manufacturer. See your TV’s user manual for more information.
† CEC Function naming may differ by TV manufacturer. See your TV’s user manual for more information.
Place the included wall mounting template against the wall under your TV.
Mark the two bracket holes using a pencil.
Install the wall mount brackets to the wall. Be sure your screws are attached to wood studs, drywall anchors (for drywall), or concrete anchors (for brick/concrete walls).
Screws for attaching the bracket to the wall are not included. Choose the screw type and length appropriate to your home’s construction. If in doubt, consult a professional installer.
* Do not use any of the included screws for the wall mount installation. These are not intended for mounting.
Hang the sound bar on the wall mount backets then slide down to lock in place.
There is no power.
There is no sound.
I hear buzzing or humming.
The remote isn’t working.
Reference file: Vizio M21D-H8R M-Series All-in-One Home Theater Sound Bar
Series: M-Series
Additionally, the document applies to other Vizio models: M21D-H8
