The Vizio also has onboard Dolby Digital decoding, unlike some of its competitors. Dolby Digital decoding isn't a must-have sound bar feature, but it can be useful in a few instances. One is when using a TV's internal over-the-air tuner, as TVs send a Dolby Digital signal from their optical output, so you need a sound bar with Dolby Digital decoding to hear audio. This can also be necessary if a TV's built-in Smart TV feature outputs a Dolby Digital signal. With the Vizio, you don't have to worry about that issue at all.
Speaker calibration isn't required for the SB4021M-A1; just hook up the sound bar directly to your TV's digital audio output. Vizio claims the SB4021M-A1's wireless subwoofer can be placed up to 60 feet away from the sound bar, but for best sound quality we recommend keeping it within 8 feet or less of the speaker. The subwoofer pairs with the sound bar automatically.
The SB4021M-A1 has bass and treble controls, so it's easy to fine-tune the speaker's tonal balance to taste, over a plus or minus range of 10 steps. We settled on +3 for the bass and -3 for the treble for most of our listening tests. No matter what settings we used, the blend between the subwoofer and sound bar was never perfectly seamless, so we were always aware that the bass was coming from the subwoofer. Ideally, all of the sound should appear to come from the speaker.
The car chase scenes in the "Ronin" Blu-ray, through the winding city streets of Nice, France, proved the SB4021M-A1's home theater moxie in a hurry. The big Audi S8's roaring horsepower was audible, via the SB4021M-A1's surprisingly potent subwoofer, and the sound bar was able to play loudly without distortion. With the remote you can dial in as much bass as you want, but it's not as deep and powerful as a cheap separate sub like the $79 Dayton Audio Sub-800, though as budget-priced sound bar-wireless sub combos go, the SB4021M-A1's bass is plenty powerful.
Dialogue sounded thinner than we'd like, and we couldn't make it better with the bass and treble controls. Music was hit or miss. Jazzy singer Patricia Barber's "Modern Cool" surround-sound Blu-ray sounded sweet, and her rhythm section's solid grooves came through loud and clear. Rock music was less convincing; the gap between the subwoofer and sound bar was the culprit.
Haier's SBEV40-Slim sound bar had no such problem. The blend was smooth, so the Haier had a fuller sound balance on movies and music. Its stereo soundstage was bigger and more spacious, but some buyers might prefer the SB4021M-A1 for its brighter and more detailed sound. The SB4021M-A1's sub was also more powerful than the SBEV-40 Slim's sub. Both systems are good, but we found the SBEV-40 Slim easier to listen to over the course of a movie.
The big catch to our comparison? Our reference Haier SBEV40-Slim sound bar was recently discontinued, and Haier is getting out of the sound bar business entirely. The Vizio's SB4021M-A1's performance is much more respectable in that light -- since you can't get the exceptional SBEV40-Slim anymore, the SB4021M-A1 is one of the better performers currently on the market.
Conclusion: A solid pick, for now
If you need a sound bar now, the Vizio SB4021M-A1 is one of your best options, with an all-around competent blend of good design, features, and sound quality. But if you can wait a few more months, better models are likely on their way, especially if you want built-in Bluetooth.