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The LG SLM3R is a Walmart-exclusive 4.1 channel soundbar system rated at 420 watts (W), with a wireless subwoofer and two rear speakers, and in 2026 it’s a decent used buy only if you find it cheap. It’s not a 2.1 bar, as some listings suggest: LG and Walmart both describe it as a 4.1 system with surround speakers. It skips High-Definition Multimedia Interface (HDMI) entirely and connects by optical cable or Bluetooth, and LG has discontinued it.
Quick verdict: The SLM3R gives you rear surround speakers and a big subwoofer for a low used price, and owners like its bass and easy pairing with LG televisions (TVs). The missing HDMI Audio Return Channel (ARC), the lack of a center channel, and no Dolby Atmos keep it a basic system. Buy one for under $100 or so; otherwise, LG’s S60TR is the better current pick. Check the LG SLM3R price on Amazon.
Key takeaways
- What it is: A 2021 Walmart model: a 35-inch bar, a wireless subwoofer, and two rear speakers rated at 420W total.
- Who it’s for: Budget buyers with an optical-equipped TV, especially LG TV owners, who want rear surround sound.
- Price: Walmart no longer stocks it, and a used unit was listed on eBay for $85 as of November 2026. Prices change often.
- Main weaknesses: No HDMI port, no center channel, and no Dolby Atmos or Digital Theater Systems (DTS) Virtual:X.
- Status: Discontinued; LG’s 5.1 channel S60TR is the closest current replacement.
Is the LG SLM3R a 2.1 or 4.1 soundbar?
The SLM3R is a 4.1 channel system. LG’s US product page lists “4.1 channel 420W” among its key features, and Walmart’s listing sells it as the “LG 4.1 Channel 420W Soundbar Surround System with Wireless Speakers.” The “4” covers the bar’s left and right channels plus two rear speakers, and the “.1” is the subwoofer.
LG has sold several Walmart models with an “M” in the name, such as the SLM5Y and SLM6Y. The SLM3R’s bar and subwoofer dimensions closely match LG’s SN4R, a 420W 4.1 system with HDMI and DTS Virtual:X, so the two appear closely related. The SLM3R drops the HDMI ports, though. If you want LG’s other 4.1 systems, read our LG 4.1 channel 420W soundbar review of the SJ4R, which has HDMI ARC, and our LG 4.1 wireless Bluetooth soundbar review of the smaller SQC4R.
LG SLM3R at a glance
| Spec | LG SLM3R |
|---|---|
| Channels | 4.1 (bar, two rear speakers, wireless subwoofer) |
| Rated power | 420W total; Walmart rates the subwoofer at 200W |
| Inputs | Digital optical and Universal Serial Bus (USB) |
| HDMI | None |
| Wireless | Bluetooth with a pairing lock, plus LG TV Sound Sync (wired or wireless) |
| Audio formats | Dolby Digital |
| Sound modes | Adaptive Sound Control (ASC), Standard, Cinema, Bass Blast, and Bass Blast+ |
| Soundbar size | About 35.1 x 2.3 x 3.4 inches |
| Subwoofer size | About 6.8 x 15.4 x 10.3 inches |
| Rear speakers | About 3.5 x 5.5 x 3.2 inches each, wired to a wireless receiver (2.4 x 8.7 x 6.9 inches) |
| In the box | Remote, batteries, optical cable, and rear speaker cable |
| Release and status | Owner’s manual dated 2021; sold at Walmart; discontinued |
Specs come from LG’s US product page, Walmart’s listing, and the SLM3R owner’s manual. LG lists the SLM3R as discontinued, and Walmart shows it out of stock.
Design and setup
The SLM3R bar measures about 35 inches wide and 2.3 inches tall, so it pairs well with 43- to 55-inch TVs and stays below most screens. The subwoofer stands about 15.4 inches tall, which gives it more cabinet volume than many budget subs, and it connects wirelessly to the bar.
The rear speakers use the same approach as LG’s other budget 4.1 systems. Each speaker connects by cable to a small wireless receiver, and that receiver needs an outlet. Place the receiver behind your couch, run short wires to each speaker, and you avoid long cables across the floor. Walmart notes that you can wall mount the rear speakers.
Connectivity and features
The SLM3R’s back panel has only power, optical, and USB connections, according to the SLM3R owner’s manual. Connect the included optical cable from your TV’s optical output and set your TV’s audio output to the optical port. Because optical doesn’t carry HDMI Consumer Electronics Control (CEC), your TV remote may not control volume on every brand. LG TV owners get the smoothest experience: LG Sound Sync lets an LG TV control the bar over optical or Bluetooth, and the bar can power on with the TV.
If your TV lacks an optical port, Bluetooth works as a fallback, though it can add a small audio delay. The USB port plays music files from a flash drive, and the LG Sound Bar app handles basic control. A Bluetooth lock setting stops the bar from switching to Bluetooth when a nearby phone connects, which helps in apartments and shared homes. If your TV sits far from the bar, a longer optical audio cable is an inexpensive fix.
Sound modes cover the basics. Adaptive Sound Control analyzes what you watch and adjusts the sound, Cinema widens the soundstage, and Bass Blast and Bass Blast+ boost low end. You can also adjust the subwoofer, rear speaker, treble, and bass levels separately.
Sound quality: what owners report
We found no lab review of the SLM3R, which Walmart sold as an exclusive, so owner feedback carries the most weight. On eBay, owners rate it about 4.9 out of 5 from seven ratings and describe good sound quality, solid design, and good value. One owner praised the bass and said the bar turns on automatically with an LG TV, but felt the rear speakers could play louder with better separation from the front.
That fits the design. The 420W rating and large subwoofer give the SLM3R plenty of punch for action movies in a small or medium room. Without a center channel, though, voices come from the bar’s left and right drivers, and dialogue can get lost during loud scenes. The rear speakers only carry discrete sound when the source sends 5.1 audio, so turn up the rear level in the settings if they seem too quiet.
Pros and cons
Pros
- Real rear surround speakers and a large wireless subwoofer
- 420W rating gives plenty of punch for small and medium rooms
- Easy setup with LG TVs through Sound Sync
- Bluetooth lock and separate level controls
- Optical cable included
Cons
- No HDMI ARC or HDMI inputs
- No center channel for dialogue
- No Dolby Atmos or DTS Virtual:X
- Rear speakers need wires and an outlet
- Discontinued and sold only through Walmart
LG SLM3R vs. current alternatives
Amazon is our main affiliate partner, and it carries LG’s current surround systems and several budget alternatives. Here’s how they compare:
Compare similar soundbars on Amazon
| Soundbar | Channels | HDMI ARC | Best for | Shop |
|---|---|---|---|---|
| LG SLM3R | 4.1 with rear speakers | No | Cheap used surround over optical | Check price |
| LG S60TR | 5.1 with rear speakers | Yes | LG’s current budget surround system | Check price |
| Vizio V-Series 5.1 (V51x-J6) | 5.1 with rear speakers | Yes | Low sale prices | Check price |
| Hisense AX5100G | 5.1 with rear speakers | Yes | Dolby Atmos on a budget | Check price |
| LG SP8YA | 3.1.2 with wireless subwoofer | Yes | A stronger front stage with Atmos | Check price |
- LG S60TR: It adds the center channel and HDMI ARC the SLM3R lacks. It listed at $400, and Best Buy sold it for $249.99 in November 2025, according to Slickdeals. See the LG S60TR on Amazon.
- Vizio V-Series 5.1: A popular budget 5.1 system with a center channel. Read our Vizio V-Series 5.1 soundbar review.
- Hisense AX5100G: It adds Dolby Atmos processing and rear speakers at a budget price.
- LG SP8YA: Skip rear speakers for a stronger bar with a center channel and Atmos. Read our LG SP8YA review.
Walmart shoppers can also look at our Onn 5.1 soundbar review. If you prefer a slim LG bar without rear speakers, our LG SJ8 soundbar review covers an older 4.1 option.
Who should buy the LG SLM3R?
Buy the SLM3R used if it costs under about $100, comes with the subwoofer, both rear speakers, the wireless receiver, and the remote, and your TV has an optical output. It suits LG TV owners best, since Sound Sync handles power and volume. Skip it if your TV lacks optical, if you need clear dialogue, or if you want Atmos or a warranty. The S60TR costs more but fixes those gaps.
Frequently asked questions
Is the LG SLM3R a 2.1 or 4.1 soundbar?
The LG SLM3R is a 4.1 channel soundbar system. It includes the bar, two rear surround speakers, and a wireless subwoofer, and LG rates the system at 420W.
Does the LG SLM3R have HDMI?
No, the LG SLM3R doesn’t have HDMI. It connects to your TV with an optical cable or Bluetooth, and it also has a USB port for music files.
Where can you buy the LG SLM3R?
The LG SLM3R was a Walmart model, and it’s now discontinued. You can still find used units on marketplaces such as eBay.
What is the best replacement for the LG SLM3R?
The LG S60TR is the best LG replacement for the SLM3R. It adds a center channel and HDMI ARC in a 5.1 channel system with rear speakers.
Final verdict
The LG SLM3R is a capable budget surround system: it brings rear speakers, a large wireless subwoofer, and easy LG TV pairing for very little money on the used market. Its optical-only connection, missing center channel, and lack of Atmos limit it. Grab one only at a low used price; otherwise, the LG S60TR is the better buy. Check the current LG SLM3R price on Amazon.