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Vizio S4251w-B4 review: A sterling sound bar for surround-sound devotees

The S4251w-B4 sports rear speakers for unparalleled home theater sonics from a sound bar, although it has some quirks.

Matthew Moskovciak Senior Associate Editor / Reviews - Home theater
Covering home audio and video, Matthew Moskovciak helps CNET readers find the best sights and sounds for their home theaters. E-mail Matthew or follow him on Twitter @cnetmoskovciak.
Steve Guttenberg
Ex-movie theater projectionist Steve Guttenberg has also worked as a high-end audio salesman, and as a record producer. Steve currently reviews audio products for CNET and works as a freelance writer for Stereophile.
Matthew Moskovciak
Steve Guttenberg
9 min read

Nearly every sound bar claims it can create faux surround sound without extra speakers, and with a few exceptions, those claims are always overhyped.


Vizio S4251w-B4

The Good

The <b>Vizio S4251w-B4</b> sound bar includes two rear speakers, allowing it to deliver a real surround-sound experience from a sound bar system. Its smart design lets you to connect the rear speakers to the wireless subwoofer in the back of the room, which minimizes the wire clutter that often accompanies surround sound. The sound bar itself has a stylish look, with a great remote that includes a built-in display. Features are well-covered, too, with built-in Bluetooth and Dolby/DTS decoding. And it's a good value, considering it includes two additional speakers.

The Bad

The sound bar may block your TV's remote sensor when used in tabletop position. Also, if you use your TV to switch inputs, you likely won't get the best possible surround experience, although most listeners won't notice. And there's no guided speaker calibration, so you'll need to rely on your own ears for setup.

The Bottom Line

Vizio's S4251w-B4 sports rear speakers for unparalleled home theater sonics from a sound bar, although it has some quirks.

The Vizio S4251w-B4 ($330 list) is one of the very few sound bar systems on the market that can deliver true surround sound, precisely because it augments the traditional sound bar/subwoofer configuration with two rear speakers. The combination delivers some of the best sound we've heard from a budget sound bar, and nothing at this price competes in terms of immersive home theater sound. The rest of the package is polished, too, with a tasteful design, built-in Bluetooth, and a minimalist, innovative remote with a built-in display.

We have really just two reservations about the S4251w-B4. One is that, like many sound bars, with its 3.74-inch height it may possibly block your TV's remote sensor if you position it in front of your TV. The other is that it can be surprisingly difficult to get a true surround-sound signal to the S4251w-B4 because of the frequently overlooked reality that most TVs end up converting incoming surround signals to stereo. And, coincidentally, both of those quirks aren't a problem on the competing Sony HT-CT260 ($300), which gives excellent sound as well.

But the Sony HT-CT260 can't offer up a real surround experience, and that's the S4251w-B4's trump card that makes it such a compelling product. It's not quite a no-compromise sound bar, but it's as close as you'll get for $330.

Design: True rear speakers with less hassle
What separates the S4251w-B4 from every other sound bar on the market is its dedicated rear speakers.

Vizio S4251w-B4 rear speakers
Sarah Tew/CNET

Rear speakers usually mean running wires all over your living room, but Vizio keeps the clutter to a minimum, having you connect the speakers to the wireless subwoofer, rather than a unit that lives in your TV cabinet. If you place the subwoofer in the back of the room, you avoid having to run cables from the front of your living room to the back, which is what usually ends up causing most of the clutter. (The subwoofer does need to be plugged into an outlet.) Most manufacturers would call these "wireless" speakers, although Vizio thankfully doesn't, because, well, they require wires.

The sound bar itself has a particularly refined look. Vizio has a penchant for glossy black finishes that tend toward tacky, so the S4251w-B4's understated matte black look is a welcome change. It's pretty much a "nothing-but-speaker" look from the front, with just a thin strip of black sitting under the grille. It's not a particularly thin design at 3.15 inches, but it lends the S4251w-B4 a substantial (but not bulky) feel that implies that the Vizio is built for performance. It doesn't quite have the build quality of the Sonos Playbar, but it feels better constructed than any previous Vizio sound bar.

Vizio S4251w LED display
Sarah Tew/CNET

While there's not a full-on "front-panel display," the S4251w-B4 does provide visual feedback via a row of small LED lights on the bottom left of the sound bar. They light up sequentially when you adjust the volume or tweak bass/treble settings, and in a lot of ways, the subtle lights are better than the smallish displays included on many sound bars that are difficult to see from across the room.

The only real design flaw is that the S4251w-B4 might block your TV's remote sensor if you place it in the common tabletop position. It's an issue that can occur with many sound bars that sit in front of your TV (opposed to under, like pedestal-style sound bars), and while it won't be a problem with every TV, it did block the sensor on our Sony XBR-55HX950. Changing inputs on the TV required holding the remote up high, angled over the sound bar, which gets annoying fast.

It's not an issue if you'll be wall-mounting the sound bar, and you can also work around the issue by using a small TV riser (or a couple of books) to boost the TV above the sound bar. Still, potential buyers may want to locate their TV's remote sensor and break out the tape measure; again, the S4251w-B4's sound bar stands 3.74 inches tall. It would have been nice if Vizio included a remote control signal pass-through feature, included on the competing Sony HT-CT260.

A remote worth talking about
Most sound bar remotes feel like afterthoughts, but it's obvious there's been some work put into the S4251w-B4's clicker. Its caliber is clear as soon as you pick it up, with a substantial feel and minimalist selection of buttons that easily fall under your thumb. The volume buttons at the bottom are even slightly tilted to make them easier to feel by touch; it puts the thin, credit card-style remotes found on other sound bars to shame.

Vizio S4251w remote
Sarah Tew/CNET

What really sets the S4251w-B4's remote apart is its built-in display. It's a smart idea: why not look at the remote right in your hand instead of squinting at a tiny display across the room on your sound bar?

Vizio S4251w-B4 remote display
Sarah Tew/CNET

In practice, it's not quite the perfect solution you want it to be. Figuring out the logic of how the menus work on the single-line display takes some getting used to. And with the display on the remote, it's also easy to forget that the remote actually needs to be pointed at the sound bar for your commands to take effect. The instinct is to angle the display toward your eyes, with the remote pointing upward, only to realize the sound bar never received your commands. Still, you do eventually adjust to its quirks; its excellent button layout and feel make it a great remote overall.

Features: Bluetooth, Dolby/DTS, and more
There are four inputs on the back of the sound bar that should cover everything you need: optical, coaxial, minijack, and analog. Sure, that's only enough for four devices if you're connecting everything directly to the sound bar, but you're likely better off using your TV to switch among devices, in which case you probably don't need more than a single optical input.

Vizio S4251w-B4 inputs
Sarah Tew/CNET

The S4251w-B4 also has built-in Bluetooth, which is pretty much a must-have feature for sound bars this year. Bluetooth is the easiest way to wirelessly stream music from the vast majority of smartphones and tablets. There is compression with Bluetooth audio, so there is some sound quality lost, but it's less noticeable from a sound bar than a system with separate speakers.

There's also onboard Dolby Digital and DTS decoding, which isn't essential on a sound bar, but can come in handy in some situations. Unfortunately most TVs "dumb down" incoming Dolby Digital and DTS (more on this later), so if you're using your TV as a switcher, you'll rarely take advantage of the built-in surround-sound decoders.

Speaker setup: Strictly DIY
Since the S4251w-B4 is technically a 5.1-channel speaker system, you might think it would include some type of automatic speaker calibration, but you're on your own in terms of adjusting levels.

It's easy enough to do by ear if you have some experience with how surround should sound, but some guidance would have been nice for home-audio neophytes. We adjusted the surround speakers' volume by ear to create a natural front-to-rear blend, and continued to fine-tune the surround speakers' volume as we watched a few movies. The S4251w-B4's tonal balance also sounded a little "thin," so we boosted the bass to +3 and lowered the treble to -1. Those settings worked well in our room, but they'll be different for everyone depending on space and preferences.

Sound quality: Real home theater sonics from a sound bar
We started our S4251w-B4 auditions with just the sound bar and subwoofer -- no surround speakers -- to get an apples-to-apples comparison with the Sony HT-CT260. The Vizio's sound was brighter and clearer than the Sony's, while also projecting a wider, better-focused, and more detailed sound stage with movies and music. The S4251w-B4's subwoofer's bass definition was also better, but the Sony's sub packed more of a wallop, with superior bass weight and oomph. We were concerned that placing the S4251w-B4's subwoofer in the back of the room would adversely affect sound quality or the blend between sub and sound bar, but it did not.

The S4251w-B4 was an adept home theater performer, handling demanding action movies with ease, although it was only average with CDs. The S4251w-B4's TruVolume mode effectively limited soft-to-loud volume changes for late-night listening sessions. Even without the surround speakers, the S4251w-B4 was mighty impressive with movies, although the 54.5-inch ultrawide Sharp HT-SB60 sound bar was an even bigger-sounding system. The HT-SB60's richer and fuller tonal balance outclassed the S4251w-B4's sound in stereo, and the HT-SB60 could play louder without strain.

Adding the S4251w-B4's surround speakers to the system upped our estimation of its sound quality. Many sound bar speakers use processing to simulate surround effects, but even the best and most expensive ones can't match the room-filling sound of actual surround speakers. Our collection of music concert DVDs and Blu-rays sounded great over the S4251w-B4 with the surround speakers, coming closer to the sound of an AV receiver and a 5.1-channel speaker system than any other sound bar we've tested. If you're looking to simplify with a sound bar, but still preserve the surround-sound experience, the Vizio S4251w-B4 is the way to go.

But can you get true surround?
So the S4251w-B4 can create the most immersive, convincing home theater sound we've heard from a budget sound bar -- the only problem is, it's harder than you'd think to get the full effect.

If you connect all your devices directly to your TV first -- as Vizio instructs you to do -- the S4251w-B4 will likely only receive a two-channel PCM signal. That's because the vast majority of TVs "dumb down" incoming surround signals to two-channel PCM, rather than passing a true surround-sound signal. We tested several TVs in the CNET lab and only one of them (Sony's high-end XBR-55HX950) passed bona fide true Dolby Digital signal via its optical audio output.

That doesn't mean you won't hear anything in the rear speakers with the dumbed-down signal. The S4251w-B4 includes DTS Circle Surround processing, which is capable of creating a faux surround-sound mix from stereo sources. Switching between full Dolby Digital and DTS Circle-created faux surround on "Ratatouille" made it clear that there's a definite difference, with the Dolby mix sounding livelier, with a more defined surround-sound stage. But the DTS Circle mix wasn't bad, either, still creating a rainy ambiance in the opening scene with pitter-patter in the surround channels. Most listeners will likely appreciate the 360-degree sound without being too picky about the difference.

The other workaround is directly connecting devices to the sound bar using their audio outputs, rather than using your TV as as switcher. It's ultimately less convenient and you'll be limited to four devices overall. Only two of the inputs support true surround sound (optical and coaxial), and one of your devices will need a coaxial audio output, which is less common. It can work for some setups, but it's less than ideal. (Consider a universal remote to ease the pain of all the input switching.)

What are the alternatives?
The most compelling alternative to the S4251w-B4 is Sony's HT-CT260. If you don't want the extra speakers and wires of Vizio's 5.1 sound bar, the HT-CT260 is our current top choice for a traditional stereo sound bar, with solid sound quality and built-in Bluetooth for around $300. It also has a feature that passes remote signals from the front of the sound bar to the back, which helps avoid the problem of the sound bar blocking the TV's remote sensor.

Sharp's HT-SB60 is also an attractive option with even bigger sound quality from a stereo sound bar, although its extra-long sound bar won't make it a great fit for many setups. Vizio is also planning on releasing a 2.1 version of the S4251w-B4 later this year, although the release date isn't final yet.

Our other favorite sound bar is the pedestal-style SpeakerCraft CS3, which is a much sleeker-looking option that sits under your TV, avoiding the "sound bar blocks my TV's remote sensor" issue. It also sounds great without a separate subwoofer, but its $600 price tag pushes it out of consideration for budget shoppers.

Conclusion: Unbeatable surround, if it works for you
The S4251w-B4 isn't necessarily the most accessible sound bar, as it won't work well in every living room, depending on your TV's remote sensor and whether you'll tolerate the extra speakers. But if it works for your space and you want a much more immersive sound bar experience, the Vizio S4251w-B4 sounds excellent and is a solid value at $330.


Vizio S4251w-B4

Score Breakdown

Design 7Features 8Sound 9Value 8