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LG S40T Soundbar vs Onn 5.1 Ultra-Slim Soundbar System

The LG S40T is the simpler, tidier pick: a 2.1 bar with a wireless subwoofer, Dolby Digital and DTS, Clear Voice Plus, and one-remote control with LG TVs. The onn 5.1 system gives you real rear satellites, Dolby Atmos and DTS:X, and more total power, but it is a much bigger 13-piece setup with a mixed reputation for reliability. Buy the LG for a small room, a clean look and easy TV control; buy the onn if you want surround effects and Atmos on a budget and have space behind the couch.

  • Choose the LG S40T if you want a compact 2.1 bar with a wireless subwoofer, clear dialogue, and one-remote control with an LG TV.
  • Choose the onn 5.1 if you want actual rear speakers, Dolby Atmos and DTS:X decoding, and more power for a dedicated movie room.

Prices

  • LG S40T Soundbar: $97.00 at eBay (last seen Nov 9)
LG
LG S40T

LG S40T Soundbar

LG S40T

4.1(80 ratings)
$97.00
at eBay
Checked Nov 9
See all prices and details
Visit eBay

Store links may earn us a commission.

Pros
  • Wireless subwoofer adds real bass from a small bar
  • Clear Voice Plus makes dialogue easier to follow
  • One remote runs the bar and an LG TV together
  • HDMI ARC, optical, USB and Bluetooth 5.3 cover most setups
  • Compact and wall-mountable
Cons
  • No rear speakers, so no true surround
  • No Dolby Atmos or DTS:X
  • No Wi-Fi streaming or AirPlay
  • Power figures in the listing conflict (300 W vs 200 W)
onn
Onn 5.1 Channel Ultra-Slim Surround Soundbar System with Dolby Atmos, 36 Inch

Onn 5.1 Ultra-Slim Soundbar System

Onn 5.1 Channel Ultra-Slim Surround Soundbar System with Dolby Atmos, 36 Inch

4(567 ratings)
See all prices and details
Pros
  • Two satellite speakers give real rear-channel surround
  • Dolby Atmos and DTS:X support at this tier is rare
  • More peak power for a larger room
  • Roku TV ready with simple setup
  • Wide input set including AUX and optical
Cons
  • Thirteen pieces to place and wire; satellites need room behind you
  • Large 36 in bar and bulky sub
  • No voice assistant and no Wi-Fi
  • Owner ratings are only average for a 5.1 system

What separates them

LG S40T SoundbarOnn 5.1 Ultra-Slim Soundbar System
Channel layout2.1 channels: bar plus wireless subwoofer, no rear speakers5.1 channels: bar, wireless subwoofer and two satellite speakers
Immersive formatsDolby Digital and DTS Digital; no height or object audioDolby Atmos, DTS:X and DTS Virtual:X
Power300 W rated (listing also states 200 W max)175 W RMS, 400 W peak
Dialogue handlingClear Voice Plus and AI Sound Pro tune speechNo dedicated voice mode; center channel carries dialogue
Footprint and setupCompact bar, 3.4 in deep, about 3.6 lb, wall or table mount36 in bar plus sub and two satellites, 13 pieces, about 24 lb
ConnectivityHDMI ARC, optical, USB, Bluetooth 5.3, Ethernet; no Wi-FiHDMI, optical, USB, AUX, Bluetooth; no Wi-Fi
TV integrationOne remote controls bar and LG TV; Alexa supportRoku TV ready; no voice assistant
Owner satisfaction4.1 of 5 from 80 ratings4.0 of 5 from 567 ratings

Price history

$169.99$109.32
Oct 29Nov 11
  • LG S40T Soundbar: lowest $109.32 on Oct 29; $169.99 on Nov 11.
  • Onn 5.1 Ultra-Slim Soundbar System: lowest $169.00 on Oct 30 at Walmart; $169.00 on Nov 1.

Prices at every store

LG S40T Soundbar

  • WalmartNew

    In stockSold by Electronic ExpressReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.

    $169.99Free shippingChecked 3 h ago
    Visit Walmart
  • eBayNew

    Availability unknownSold by olireason (100% positive, 3 ratings)Returns: Set by the eBay seller; the eBay Money Back Guarantee covers an item that doesn't arrive or isn't as described.

    $97.00+ $27.17 shippingChecked Nov 9
    Visit eBay
  • Primetime Audio VideoNew

    Availability unknown

    $166.99Checked Nov 6
    Visit Primetime Audio Video
  • NFMNew

    Availability unknown

    $169.00Checked Nov 6
    Visit NFM

Also available at

  • WalmartCheck price at Walmart

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All 24 stores and price history →

Onn 5.1 Ultra-Slim Soundbar System

  • WalmartNew

    Out of stock

    $169.00Checked 19 h ago
    Visit Walmart

Also available at

  • WalmartCheck price at Walmart
Prices and history →

Specs compared

SpecLG S40T SoundbarOnn 5.1 Ultra-Slim Soundbar System
BluetoothBluetooth 5.3, YesYes, Bluetooth wireless technology
WirelessYes2.4G/5.8G
ColorBlackBlack
Width30 in wide17.13 in
Frequency ResponseRoughly 300Hz to 3kHz (where human speech is mo…—
Crossover Frequency150 Hz (subwoofer handles frequencies below)—
Connectivity TechnologyWireless, Bluetooth—
Ports And InterfacesUSB, HDMI ARC—
Wi-FiNo—
Assistant SupportAlexa—
Speaker PlacementWall-mountable, Table-top—
Audio Configuration2.1 system—
Show all 40 specsShow fewer specs
SpecLG S40T SoundbarOnn 5.1 Ultra-Slim Soundbar System
Audio HighlightsAI Sound Pro, Dolby Digital—
Audio Channels2.1-Channel—
Design HighlightsSignature crest design—
MaterialRecycled plastic—
StyleCrest Wave—
Driver Size6.7-inch (subwoofer driver)—
Driver ConfigurationNo up-firing channels—
Driver TypeSubwoofer—
Number Of DriversFewer speakers (compared to premium systems)—

What reviewers say

LG S40T Soundbar

  • 4.1 / 580 ratings

Owners rate the S40T around 4.1 out of 5 across 80 ratings. Most praise the bass and the price for a bar with a wireless sub; complaints center on limited surround and modest music performance.

What people mention
  • BassPraisedOwners say the wireless subwoofer gives movies noticeable low-end for a budget bar.
  • DialoguePraisedClear Voice Plus is credited with making speech easier to follow in shows.
  • SetupPraisedHDMI ARC and the LG TV remote pairing make it quick to get running.
  • SurroundCriticisedListeners note the 2.1 layout cannot produce a true surround effect.

Onn 5.1 Ultra-Slim Soundbar System

  • 4 / 5567 ratings

Owners rate it 4 out of 5 across 567 ratings and mostly call it a lot of surround sound for the money. Complaints center on setup quirks, modest bass and the wired rear speakers.

What people mention
  • ValuePraisedOwners say it delivers 5.1 surround for far less than name-brand systems.
  • SetupMixedPairing with Roku TVs is quick, but some owners struggle with HDMI ARC and input switching.
  • BassMixedThe wireless subwoofer adds punch at moderate volume but can sound boomy or distort when pushed.
  • Rear speakersMixed

Questions and answers

Which is better for a small living room?
The LG S40T. It is a compact 2.1 bar with a wireless sub, so it fits under a TV and against a wall without rear speakers. The onn needs space behind the seating for its satellites to be worth it.
Does the onn really sound better for movies?
For surround effects, yes. Its rear satellites and Dolby Atmos/DTS:X decoding put sound around you, which the LG cannot do with two channels. The LG counters with clearer dialogue and simpler tuning.
Which has better dialogue clarity?
The LG S40T. Clear Voice Plus and AI Sound Pro are built to lift speech in shows and movies. The onn relies on its center channel and has no dedicated voice mode.
Which is easier to set up?
The LG. It is one bar and a wireless sub with HDMI ARC, so it is running in minutes. The onn involves a bar, a sub and two satellites, and the rear speakers need power and placement.
Is the onn worth stepping up to over the LG?
Only if you want surround and Atmos and have the room for rear speakers. If you sit close to the TV or want a tidy setup, the LG covers the basics with better TV control.
Do either support Wi-Fi streaming?
No. Both are Bluetooth only for wireless audio, though the LG adds Ethernet and Alexa support. Neither has built-in Wi-Fi music streaming.

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Max Output Power
300 W
—
Nominal Output Power300 W (RMS)—
Nominal Impedance4 Ohm (Sound bar)—
Weight3.60 lb (approximate)—
Depth3.4 in (soundbar)—
Configuration2.1 Channel—
ConnectivityBluetooth, USB, HDMI, Ethernet, Optical Audio—
Max Wattage200 W—
Special PurposeSoundbar—
ConnectionsUSB-A, Optical S/PDIF—
Weight (Subwoofer) (lb)9.3—
No. of Optical S/PDIF (pcs)1—
NFCNo—
Surround Sound FormatsDolby Digital, LPCM, DTS Digital Surround—
Depth (Subwoofer) (")9.9—
Connection on SubwooferWireless—
Width (Soundbar) (")28.4—
(ARC) Audio Return ChannelARC—
3D PicturesNo—
The satellites create real surround, but their wires to the subwoofer limit where they can go.