Description
What the AV157 Is
The ZVOX AV157 is a compact single cabinet sound bar built around one specific problem: dialogue that cannot be made out over a soundtrack. ZVOX has built its business on that problem, and its bars are commonly bought for households where someone has difficulty following speech on television, whether through hearing loss, room acoustics or the increasingly compressed mixes used in modern productions.
At 19.5 inches wide, 7.75 deep and 4 inches high, and weighing 4.69 pounds, this is a small bar. It will sit comfortably under a 32 to 43 inch television and looks out of place under a larger one. The finish is listed as espresso. Buyers whose priority is general audio improvement rather than speech specifically should compare the Yamaha SR-C20A and the VIZIO V-Series V21x-J8, both of which take a more conventional approach.
Voice Boost and Dialogue Processing
The listing gives the number of power levels as twelve, which corresponds to the twelve levels of voice boost the AV157 provides. That granularity is the key design decision. Most sound bars offer a single dialogue mode that is either on or off, which is a blunt instrument: too little help for someone with real difficulty, too much processing for someone who only needs a nudge. Twelve steps allow the amount of processing to be matched to the listener and to the content.
What the processing does is lift the frequency band where consonants live, roughly between 1 and 4 kHz, and compress the dynamic range so that quiet speech is raised relative to loud effects. The trade off is inherent rather than a flaw in implementation: pushing that band forward makes speech clearer and makes music and effects sound thinner and more processed. That is an acceptable exchange for a viewer who currently misses half the dialogue, and a poor one for someone who mainly watches concerts and action films. Buyers in the second group should look at the wider sound bars category.
Connection, Control and Cabinet
The connectivity protocol is listed as optical, which is the digital audio output found on essentially every television made in the last fifteen years and is the simplest connection to make. An optical cable carries audio only, so the television remains in charge of switching sources, and volume is controlled by the bar’s own remote rather than by the television remote. The wireless communication technology is listed as infrared, which describes the remote rather than any streaming capability.
ZVOX supplies the remote and connecting cables in the box. The remote is described in the product information as having large labeled buttons, which is consistent with the target audience and is a genuinely thoughtful detail on a product bought for accessibility. The speaker size is given as 5.25 inches with a separate 3 inch driver figure, and the surround sound configuration is listed as 2.1, though no separate subwoofer appears in the included components. Households that want real low frequency output will need to look at the subwoofers category separately.
Highlights
- Built specifically around dialogue clarity rather than general audio improvement.
- Twelve levels of voice boost rather than a single on or off dialogue mode.
- Compact at 19.5 inches wide, suited to smaller televisions.
- Optical connection, the simplest and most widely supported digital audio output.
- Remote with large labeled buttons supplied.
- Connecting cables included, so nothing further is needed to install it.
- Light at 4.69 pounds, easy to position or wall mount.
- Espresso finish rather than the usual matte black, which suits wooden furniture.
Things To Consider
This listing has no manufacturer description and no feature bullets, only an attribute table, so the AccuVoice and SuperVoice technologies the brand is known for are not described anywhere on the page and their exact behavior is undocumented here. Buyers should read the ZVOX product documentation directly before purchase, particularly to understand how the twelve levels differ from each other. The listing also gives no amplifier power figure, no frequency response and no statement of how many drivers sit behind the grille, so there is no way to compare this bar against a competitor on paper.
The channel configuration is listed as 2.1, but no subwoofer is included and the only driver sizes given are 5.25 inches and 3 inches, both of which would sit inside the bar. Anyone reading 2.1 as meaning a separate bass cabinet arrives in the box will be disappointed. A 19.5 inch cabinet cannot produce deep bass, and this bar should be understood as trading low frequency output for speech intelligibility rather than delivering both.
The connection options are also narrow. Optical is listed as the protocol, and there is no mention of HDMI ARC, Bluetooth or an analog input. Without HDMI ARC the television remote cannot normally control the bar volume, which means two remotes in daily use, and without Bluetooth the bar cannot be used to play music from a phone. The listing dates the model to June 2018, so it predates the point at which HDMI ARC became standard on bars at this level. Anyone whose television has no optical output at all, which is increasingly common on recent sets, should confirm a working connection route before ordering. Buyers who want streaming and single remote operation should compare the Hisense A620 or the Samsung HW-T400.
Who It Suits
The AV157 suits a household where following television dialogue is a real daily difficulty, where the television is small enough for a 19.5 inch bar, and where an accessible remote and a simple optical connection are worth more than streaming features. For that specific need, twelve adjustable levels of voice processing is a more considered solution than the single dialogue mode offered by mainstream bars.
It is the wrong purchase for someone who wants cinematic sound, deep bass, Bluetooth music playback or single remote control over HDMI. Buyers whose main complaint is that television audio is thin rather than unclear should look at a conventional 2.1 bar with a separate subwoofer instead.
