Vizio SB3651-E6 Review: Chromecast-Enabled 5.1 Surround Sound
The Vizio SB3651-E6 is a comprehensive 5.1 soundbar system that delivers immersive audio and smart features like Chromecast and Google Assistant, though its rear speakers require wired connections.
By Elvis Dicki
Updated October 22, 2026
The Vizio SB3651-E6, officially the VIZIO SmartCast 36″ 5.1 Wireless Soundbar System, is a home audio solution designed to upgrade a standard TV setup into a more cinematic experience. This system targets users who want a significant step up from built-in TV speakers and desire the convenience of wireless streaming and voice control without the complexity of a full A/V receiver setup. In short, it’s a packaged 5.1 surround sound system that combines a soundbar, a wireless subwoofer, and wired rear satellite speakers with smart features like Chromecast built-in and Google Assistant compatibility for a streamlined, feature-rich audio upgrade.
This review will analyze the Vizio SB3651-E6 based on its specifications, design, key features, and aggregated user feedback to determine its strengths and potential drawbacks. We will examine its performance claims, connectivity options, setup process, and overall value proposition to see if it lives up to its promise of delivering true surround sound with modern smart home integration.
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Vizio SB3651-E6 at a Glance
| Specification | Detail |
|---|---|
| Audio Channels | 5.1 Surround Sound |
| Soundbar Length | 36 inches |
| Total System Output | 101 dB SPL |
| Wireless Connectivity | Wi-Fi, Bluetooth |
| Smart Features | Chromecast Built-in, Google Assistant Compatible |
| Subwoofer | Wireless, 6.7-inch Driver |
| Satellite Speakers | Two Rear, Wired Connection |
| Key Inputs | HDMI, Optical, Analog (RCA/3.5mm) |
| Included Cables | HDMI, Optical, RCA, 3.5mm, Speaker Wires |
| Control Methods | Remote, VIZIO SmartCast App, Voice (via Google Assistant) |
Design and Build
The Vizio SB3651-E6 system is comprised of four primary components: a 36-inch wide soundbar, a wireless subwoofer, and two rear satellite speakers. The soundbar itself has a low-profile design with a depth of 3.2 inches and a height of 2.1 inches, making it suitable for placement in front of most TVs without obstructing the screen. The subwoofer, which houses a 6.7-inch driver, connects wirelessly to the soundbar, allowing for flexible placement to optimize bass response in the room. The two rear speakers, however, are not wireless; they require a physical wired connection to the subwoofer, which is a key design consideration for room layout and cable management.
The enclosure materials are listed as a combination of plastic and wood, which is typical for soundbar systems in this category. The system comes in a standard black finish. The package is noted for being comprehensive regarding included accessories. According to the specifications and user feedback, the box contains all necessary cables for various connection types, including HDMI, optical Toslink, RCA, and 3.5mm audio cables, along with speaker wires for the satellites and even velcro cable ties for organization. This eliminates the need for most users to purchase additional cables for initial setup.
Performance and Features
Audio Performance
The core promise of the SB3651-E6 is its 5.1 channel surround sound. With a total system sound pressure level of 101 dB, it is capable of filling a room with immersive audio for movies, TV, and music. The inclusion of dedicated rear speakers is a significant step up from virtualized surround sound, aiming to provide authentic directional audio cues. The wireless subwoofer is designed to handle the low-frequency effects, with a system frequency response starting at 50 Hz. It’s important to note that this 50 Hz lower limit means the deepest sub-bass tones may not be as pronounced as on systems with a wider frequency range. The system has a total power output of 150 watts.
Connectivity and Ports
Connectivity is a strong point for this system. For wired connections to your TV or other devices, it offers HDMI, optical audio, and analog RCA/3.5mm inputs. The inclusion of both HDMI and optical cables in the box provides flexibility for connecting to modern TVs that support Audio Return Channel (ARC) via HDMI or older models with optical outputs. For wireless audio streaming, the system is equipped with both Wi-Fi and Bluetooth. The Wi-Fi connectivity is crucial for enabling its smart features, while Bluetooth allows for direct pairing with smartphones, tablets, and laptops for quick audio playback.
Smart Features and Control
The “SmartCast” in the product name refers to Vizio’s smart platform, which here primarily means Chromecast is built-in. This allows users to stream audio directly from any Chromecast-enabled app on their phone or tablet over Wi-Fi, such as Spotify, Pandora, or YouTube Music, without needing to use Bluetooth. Furthermore, the system is compatible with Google Assistant, enabling voice commands for playback control, volume adjustment, and more through a separate Google Assistant device. Control over the system can be managed through the included remote, the VIZIO SmartCast mobile app—which turns a smartphone into a advanced remote—or via voice commands.
Setup, Support and Ownership
Setup involves connecting the soundbar to the TV via the included HDMI or optical cable, placing the wireless subwoofer, and running wires from the subwoofer to the two rear satellite speakers. User reviews indicate that the wireless pairing between the soundbar and subwoofer is generally quick and automatic. The most physically involved part is managing the wiring for the rear speakers, which requires planning for cable routing. The system is powered by a standard power cord, and the remote requires 2 AAA batteries, which are not listed as included.
Vizio provides a one-year parts and labor warranty for the SB3651-E6, along with free lifetime technical support. The manufacturer does not list specific details about firmware update processes or long-term software support for the SmartCast app. There is no information provided regarding optional accessories or upgrade paths for components like the satellite speakers.
What Owners Say
Overall user sentiment, reflected in the rating distribution where the majority of reviews are positive, suggests general satisfaction with the Vizio SB3651-E6’s performance for its price. Many owners praise the dramatic improvement in sound quality over built-in TV speakers, the immersive 5.1 surround effect, and the convenience of the wireless subwoofer. The comprehensive set of included cables is frequently highlighted as a positive, eliminating extra purchases. Positive reviews often mention easy setup and seamless integration with Vizio TVs.
However, critical reviews point to specific issues. Some users report frustrations with the Bluetooth functionality, noting it can require re-pairing devices frequently, which Vizio support has reportedly confirmed as a necessary step in some cases. A few mention occasional audio dropouts or the system unexpectedly entering power-saving mode during use. The requirement to wire the rear satellite speakers to the subwoofer is noted as a con for those seeking a completely wireless rear speaker setup. For more insights on how different soundbars handle audio clarity, you can explore our guide on the best TV soundbars for voice clarity.
Pros and Cons
Pros
- True 5.1 surround sound with included rear speakers
- Wireless subwoofer reduces cable clutter
- Chromecast built-in for convenient Wi-Fi audio streaming
- Google Assistant compatibility for voice control
- Comprehensive set of cables included for various connections
- SmartCast app provides robust remote control options
Cons
- Rear satellite speakers require wired connections
- Bluetooth connectivity can be unreliable, requiring frequent re-pairing
- Frequency response starts at 50 Hz, limiting deepest bass
- Full smart features require a Wi-Fi network
- Some users report occasional audio cut-outs
Who Should Buy It (and Who Should Skip It)
The Vizio SB3651-E6 is an excellent fit for users who want a significant audio upgrade for their TV and frequently use streaming music services. It’s ideal for someone seeking authentic 5.1 channel surround sound for movies and gaming without investing in a complex separates system. Its smart features cater to those embedded in the Google ecosystem who will use Chromecast audio streaming and Google Assistant voice commands. If you can manage the wiring for the rear speakers and have a stable Wi-Fi network, this system offers a lot of value.
This system may not be the best choice for those who demand a completely wireless setup for the rear speakers, as the satellites must be wired to the subwoofer. Users who prioritize Bluetooth as their primary wireless streaming method might be frustrated by the reported pairing issues. Audiophiles seeking the deepest possible bass extension below 50 Hz might find the subwoofer’s performance limiting. For those interested in other multi-room audio options, consider our look at the best smart speakers for multiroom audio.
Final Verdict
The Vizio SB3651-E6 delivers on its core promise of providing an accessible, feature-packed 5.1 surround sound system. Its combination of a wireless subwoofer, dedicated rear speakers, and smart capabilities like Chromecast and Google Assistant integration makes it a compelling package for enhancing a living room or media room. The inclusion of every necessary cable is a thoughtful touch that simplifies setup. For users who want immersive audio for movies and TV and plan to leverage its Wi-Fi streaming strengths, it represents a solid value proposition.
However, its appeal is tempered by some practical considerations. The wired rear speakers require planning for cable management, and the noted Bluetooth reliability issues are a legitimate concern for users who depend on that protocol. Potential buyers should weigh their primary use case—favoring Wi-Fi/Chromecast streaming over Bluetooth—and their willingness to handle speaker wires. When these factors align, the SB3651-E6 stands as a strong contender in its category. For comparisons with other surround sound options, our roundup of the best surround sound soundbars provides further context.
FAQs
Are the rear speakers on the Vizio SB3651-E6 wireless?
No, the two rear satellite speakers are not wireless. They require a physical wired connection to the wireless subwoofer unit. The subwoofer itself connects wirelessly to the soundbar, but the rear speakers must be connected to the subwoofer with the included speaker wires.
Does this soundbar work with Alexa or only Google Assistant?
According to the manufacturer’s specifications, the Vizio SB3651-E6 is listed as working with Google Assistant. There is no information provided in the product data indicating native compatibility with Amazon Alexa. Control via Alexa would likely require integration through a separate smart home ecosystem.
What cables do I need to set it up? Are they included?
Nearly all necessary cables are included in the box. The system comes with an HDMI cable, an optical Toslink cable, RCA audio cables, a 3.5mm audio cable, and the speaker wires for the rear satellites. This comprehensive set covers the most common connection types for TVs and other audio sources, so additional purchases are typically not required for basic setup.
Can I use the soundbar without the rear speakers and subwoofer?
The product data does not specify if the soundbar can operate as a standalone unit. Typically, in such 5.1 systems, the components are designed to work together. The subwoofer is wireless and pairs with the soundbar, so it is intended to be used. The system is marketed and sold as a complete 5.1 package, and its performance is based on all components functioning together.
About the author
Elvis Dicki writes reviews and buying guides for CyberSecLabs.