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  • Bluetooth Streaming
  • Wireless Surround Sound Speakers
  • Wireless Active Subwoofer
  • LG Sound Sync
  • TV Remote Compatibility
  • USB Playback
LG SLM4R 420W Sound Bar w/ Bluetooth Streaming and Surround Sound Speakers

Feel audio from every direction

Enjoy surround sound with the two additional wireless speakers in the mix. The 2.0ch rear speakers deliver audio from behind you for true physical depth of immersive, surround sound in a wall-mountable design.
Allow the included rear speakers to augment your audio system with two 70 watt speakers and a receiver. The two additional audio channels will boost your sound and captivate your audience constantly.
*Rear speakers are wired to the included wireless receiver but is not shown in the image.


    • Bluetooth Streaming
    • Yes
    • Surround Sound Expansion
    • Yes
    • USB Playback
    • Yes


    • Channels
    • 4.1ch
    • Total Power
    • 420W


    • TV Remote Compatibility
    • Yes
    • Smartphone Remote App (iOS/Android)
    • Android OS
    • Auto Volume Leveler
    • Yes (App)
    • Dynamic Range Control
    • Yes (App)
    • Night Mode
    • Yes (app)
    • LCD Display Auto-Dimmer
    • Yes


    • ASC (Adaptive Sound Control: Default)
    • Yes
    • Standard
    • Yes
    • Bass Blast
    • Yes
    • Bass Blast +
    • Yes
    • Movie
    • Yes


    • LPCM
    • Yes
    • Dolby Digital
    • Yes
    • DTS Digital Surround
    • Yes
    • MP3
    • Yes
    • WMA
    • Yes


    • Front
    • 50W x 2
    • Subwoofer
    • 200W (Wireless)
    • Rear
    • 60W x 2


    • Wireless Active Subwoofer
    • Yes
    • Bluetooth
    • Yes (4.0)
    • LG TV Sound Sync (Bluetooth)
    • Yes
    • LG TV Sound Sync (Optical)
    • Yes
    • Optical Input
    • Yes
    • USB
    • Yes


    • Soundbar Power Consumption
    • 23W
    • Soundbar Standby Power Consumption
    • <0.5W
    • Subwoofer Power Consumption
    • 33W
    • Subwoofer Standby Power Consumption
    • <0.5W
    • Rear Speaker Kit Power Consumption
    • 33W
    • Rear Speaker Kit Standby Power Consumption
    • <0.5W


    • TV Matching
    • 40" and above
    • Sound Bar (WxHxD)
    • 35.1" x 2.3" x 3.4"
    • Subwoofer (WxHxD)
    • 6.8" x 15.4" x 10.3"
    • Wireless Receiver (WxHxD)
    • 2.4" x 8.7" x 6.9"
    • Rear Speaker Each (WxHxD)
    • 3.5" x 5.5" x 3.2"
    • Soundbar Net Weight
    • 5.2 lbs
    • Subwoofer Net Weight
    • 11.7 lbs
    • Wireless Receiver Net Weight
    • 2.2 lbs
    • Rear Speaker Net Weight
    • 4.1 lbs
    • Shipping Size (WxHxD)
    • 37.3" X 8.8" X 14.7"
    • Shipping Weight
    • 26.7 lbs


    • Remote Control
    • Yes
    • Batteries
    • Yes (AAA)
    • Optical Cable
    • Yes
    • Rear Speaker Cable
    • Yes
    • Warranty Card
    • Yes


    • Limited Warranty
    • 1 Year Parts and Labor
    • UPC
    • 719192633650
    • Country of origin
    • China

What people are saying

Rated 1 out of 5 by from Bad Barely a year old and sound cuts in and out, bass randomly stops working. Awful
Date published: 2021-11-26
Rated 5 out of 5 by from System works perfect in my bedroom Ok so I bought this for my bedroom 2 weeks ago its paired with a 65 in samsung qled TV it is a fantastic lil unit a instruction manual wasn't needed its common sense setup don't listen to all these bad reviews people saying there Rear speakers are cutting in and out need to set the box for the rear in a way it has a clear view of the under tv soundbar pretty simple also people saying saying sub cuts out it doesn't the sub isn't designed to sit super far away from the soundbar as a person who does custom home theater for a living your sub should be up front with the soundbar placing the sub day behind the couch or on the side of the room you sit will only drown out the subtle sounds from movies coming from your rear speakers I have a 10k dollar home theater speaker setup in my living room and I'm telling you this lil system in my room kicks but for the price it's top notch sound is clean and clear if you wanna adjust all the equipment setting and complain this can't do that BUY A MORE EXPENSIVE setup if you want micro controls for the price of this it can't be beat it is not lg's fault your expectations of setting that don't come in this price range aren't in this price range get real if you wanna be fancy and want everything from a 200 dollar setup your delusional lol
Date published: 2021-02-19
Rated 5 out of 5 by from Great features at a nice price Just set up this sound bar today and am very pleased with it. All speakers work, no speaker drop out. Optical cable inclusion was a plus. Surround sound is impressive. There is a full pdf manual on line, far better than the little pamphlets included. Firestick controls volume and shuts off both TV and sound bar. Having read other reviews before purchase, I did know rear speakers were not wireless. This product was impossible to register online, however.
Date published: 2021-02-04
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Choose a support option below:


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Please review the detailed product information and help guides in the
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Every time I move the cord on the sound bar Slm4r it cuts of sound bar as if there is a short in the power cord.

Asked by: Darrel22222
The cord may be faulty or it may have a faulty connection which causes the LG SLM4R 420W Sound Bar w/ Bluetooth Streaming and Surround Sound Speakers to cut out when you move it. You will need to have the unit inspected by an LG Authorized Service Center if there is one in your area. You can visit our site at to see if there are any LG Authorized Service Centers near you or you can contact our Support Center at (800) 243-0000 for assistance...^IFV
Answered by: Ivanf
Date published: 2021-06-06

This does not have HDMI ARC, so the TV wont turn this on automatically correct?

Asked by: yeko
That is incorrect. If the HDMI ports on your TV are HDMI-CEC compliant then your TV will automatically turn the LG SLM4R 420W Sound Bar w/ Bluetooth Streaming and Surround Sound Speakers on if you activate HDMI-CEC in the TV's menu settings. Different TV manufacturer's package HDMI-CEC under different names so check your TV's owner's manual to see what name HDMI-CEC is packaged as. On LG TV's, it is packaged as LG Simplink...^IFV
Answered by: Ivanf
Date published: 2021-11-10

how many audio inputs

Asked by: crazyman
The only audio input on the LG SLM4R 420W Sound Bar w/ Bluetooth Streaming and Surround Sound Speakers is the Optical Digital Audio Input. You can also pair the soundbar with other Bluetooth enabled devices via Bluetooth for a wireless connection...^IFV
Answered by: Ivanf
Date published: 2021-11-10

What size of wire is used to connect the rear speakers to the receiver?&nbsp;

Asked by: Kelli32
The owner's manual for the LG SLM4R 420W Sound Bar w/ Bluetooth Streaming and Surround Sound Speakers does not specify what gauge of wire is used to connect the rear speakers to the wireless receiver, but the gauge of wire used for these types of speakers is typically 16 or 18-gauge wire...^IFV
Answered by: Ivanf
Date published: 2021-01-04

Do you have to have an LG to for this sound system to work?&nbsp;

Asked by: Hrodriguez1
The LG SLM4R 420W Sound Bar w/ Bluetooth Streaming and Surround Sound Speakers has Bluetooth (ver. 4.0) and an Optical Digital Audio Input so it can be paired with any Bluetooth enabled TV or connected to any TV that features an Optical Digital Audio Output via its Optical Digital Audio Input...^IFV
Answered by: Ivanf
Date published: 2021-01-04

What size bolts do I need to attach this product to a bracket on the wall? I do see 2 small size threaded female holes?

Asked by: Bvrwally
Please reach out to our support team on Twitter via @LGUSSupport or on Facebook at ^Daphane
Answered by: LG Electronics
Date published: 2020-12-09

Does the soundbar come with wall mounting hardware?

Asked by: logmarine
The LG SLM4R 420W Sound Bar w/ Bluetooth Streaming and Surround Sound Speakers does not come with any Wall Mounting hardware...^IFV
Answered by: Ivanf
Date published: 2020-11-24
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