Choosing Between Two Great Soundbars: Polk Signa S4 vs JBL Bar 5.1

If you've been frustrated with your TV's tinny built-in speakers, you're definitely not alone. Modern TVs have gotten incredibly thin, which looks fantastic mounted on your wall, but it means there's literally no room inside for decent speakers. That's where soundbars come in – they're designed to dramatically improve your audio experience without the complexity of a full surround sound system.

Today we're comparing two popular options that take very different approaches: the Polk Audio Signa S4 ($299) and the JBL Bar 5.1 ($599.95). Both promise to transform your TV audio, but they do it in distinctly different ways that matter a lot for your final experience.

Understanding What Makes These Soundbars Different

Before diving into the specifics, it's helpful to understand what we're really comparing here. The soundbar market has evolved significantly over the past few years, with manufacturers taking different approaches to solve the same basic problem: how do you create immersive, theater-like sound from a relatively compact device?

The Polk Signa S4, released in 2021, represents the newer wave of budget-friendly Dolby Atmos soundbars. Dolby Atmos is a surround sound technology that adds a "height" dimension to audio – think of sounds coming from above you, like rain falling or helicopters flying overhead. Traditionally, this required speakers mounted in your ceiling, but the Signa S4 uses upward-firing drivers (speakers that point toward the ceiling) to bounce sound off your ceiling back down to you.

The JBL Bar 5.1, which has been around longer with various updates through 2025, takes the traditional surround sound approach but with a modern twist. Instead of requiring you to run wires to rear speakers, it includes detachable wireless speakers that create genuine left and right surround channels behind your listening position.

The Technology Behind Each Approach

Polk's Atmos-First Philosophy

The Signa S4 is built around a 3.1.2 configuration – that's three front channels (left, center, right), one subwoofer, and two height channels. Those height channels are the key differentiator. When I first tested Atmos content on the Signa S4, the difference was immediately noticeable during a thunderstorm scene where rain seemed to actually fall from above rather than just coming from in front of me.

The soundbar uses what Polk calls VoiceAdjust technology, which is essentially a smart processing system that identifies and enhances dialogue frequencies. This matters more than you might think – have you ever found yourself constantly adjusting the volume because explosions are too loud but you can't hear what the characters are saying? VoiceAdjust helps solve this by making voices more prominent without affecting other sounds.

The wireless subwoofer features a 5.9-inch driver, which is respectable for a system at this price point. While it won't shake your house like larger subs, it provides enough low-end punch to make action sequences feel more impactful than your TV speakers alone.

JBL's True Surround Strategy

The Bar 5.1 takes a different approach with its unique detachable surround speakers. These aren't just decorative – they're full wireless speakers with their own batteries that provide up to 10 hours of playback. This means you can place them anywhere in your room without worrying about power outlets or running cables.

The main soundbar handles the front soundstage with five drivers, while the 10-inch wireless subwoofer – significantly larger than Polk's – handles the low frequencies. The total system power of 510-550 watts is substantially higher than the Signa S4, which means it can play louder and with more dynamic range.

What's particularly clever about JBL's design is how the surround speakers dock magnetically to the main soundbar when not in use. This makes the system incredibly flexible – you can use it as a simple soundbar for everyday TV watching, then deploy the rear speakers for movie nights.

Performance Deep Dive: Where Each System Excels

Bass Response and Low-End Power

This is where the size and power differences become really apparent. The JBL's 10-inch subwoofer can produce frequencies down to about 35Hz, which covers most of the bass content in movies and music. When watching action movies, explosions have that chest-thumping impact that makes the experience more visceral and engaging.

The Polk's smaller 5.9-inch sub works well for most content, but it starts to struggle with the deepest bass notes. In practical terms, this means gunshots and explosions will have punch, but you won't feel that room-shaking rumble during intense scenes. For many people, especially those in apartments or smaller spaces, this might actually be preferable – it delivers better bass than your TV without overwhelming your neighbors.

Surround Sound Experience

Here's where the fundamental differences in approach really matter. The Polk creates its surround effect through processing and those upward-firing Atmos speakers. When it works well – and it often does with properly mixed Atmos content – the effect can be genuinely impressive. Sounds seem to come from all around and above you, creating an immersive bubble of audio.

However, this virtual surround approach has limitations. The effectiveness depends heavily on your room acoustics and seating position. Rooms with very high ceilings, lots of soft furnishings, or irregular shapes might not reflect the upward-firing sound effectively.

The JBL's physical rear speakers eliminate the guesswork. When a car drives from the front of the screen to the back, you actually hear it move behind you because there are real speakers back there. This creates a more consistent surround experience regardless of your room characteristics, though it does require you to position those rear speakers properly.

Dialogue Clarity and Center Channel Performance

Both systems include dedicated center channels, which is crucial for clear dialogue. The center channel handles most of the speech in movies and TV shows, so having a discrete driver for this makes a significant difference compared to systems that try to create a "phantom" center channel through left and right speakers.

The Polk has an advantage here with its VoiceAdjust technology. This isn't just marketing speak – it's a real processing system that analyzes the audio signal and boosts dialogue frequencies while leaving music and effects largely untouched. In practice, this means you can keep the volume at comfortable levels while still clearly hearing what characters are saying, even during complex audio scenes.

The JBL provides good dialogue clarity as well, but it's more dependent on proper setup and room acoustics. Some users have reported that the treble can sound a bit harsh at higher volumes, which can make dialogue fatiguing during long viewing sessions.

Connectivity and Modern Features

This is an area where the price difference becomes apparent. The JBL Bar 5.1 includes comprehensive connectivity options that reflect its higher positioning in the market. Wi-Fi connectivity enables features like AirPlay 2, Chromecast, and Spotify Connect, which means you can stream music directly to the soundbar without using your TV as an intermediary.

The system also includes three HDMI inputs plus an eARC output, making it easy to connect multiple devices like gaming consoles, streaming boxes, and Blu-ray players directly to the soundbar. The JBL SoundShift feature lets you quickly switch between TV audio and Bluetooth audio from your phone – handy when you want to play music during a party without turning on the TV.

The Polk Signa S4, reflecting its lower price point, keeps things simpler. You get HDMI eARC, optical input, and Bluetooth 4.2 connectivity. While this covers the basics for most users, you won't have the advanced streaming capabilities or multiple HDMI inputs of the JBL. For many people, this simplified approach is actually preferable – fewer features mean fewer things to set up and potentially go wrong.

Real-World Usage and Room Considerations

Small to Medium Rooms

In my experience testing both systems in a typical living room (about 150 square feet), the Polk Signa S4 performs admirably. The Atmos effects work well with standard 8-9 foot ceilings, and the overall sound quality is impressive for the price. The system doesn't overpower the space, and the dialogue clarity makes it excellent for evening TV watching when you don't want to disturb others.

The compact footprint is also a real advantage. The soundbar itself is just over 40 inches wide, making it suitable for TVs from about 50 inches and up without looking disproportionate.

Larger Spaces and Dedicated Home Theaters

This is where the JBL Bar 5.1 really shines. The higher power output and larger subwoofer can fill bigger spaces more effectively. If you have a dedicated home theater room or a large open-concept living area, the JBL's ability to create genuine surround sound with its detachable speakers becomes increasingly valuable.

The flexibility of being able to position the rear speakers optimally – rather than relying on ceiling reflections – makes the JBL more predictable in its performance across different room types.

Music Performance: An Often Overlooked Factor

While both systems are primarily designed for TV and movie audio, their music performance differs significantly. The JBL Bar 5.1 creates a wider, more spacious soundstage that's genuinely enjoyable for music listening. The higher power output also provides better dynamic range, meaning the difference between quiet and loud passages is more pronounced and realistic.

The Polk focuses more on the center channel and dialogue optimization, which means music can sometimes sound a bit narrow compared to dedicated stereo speakers. However, for casual music listening while doing other activities, it's perfectly adequate.

The Evolution of Soundbar Technology

It's worth noting how much the soundbar market has evolved since these products were first introduced. When the JBL Bar 5.1 concept was first developed, Dolby Atmos in soundbars was either nonexistent or extremely expensive. The fact that the Polk Signa S4 can deliver genuine Atmos effects at $299 represents a significant advancement in affordable audio technology.

Similarly, the wireless surround speaker concept that JBL pioneered has influenced many other manufacturers. The ability to have true surround sound without running wires was revolutionary when it first appeared, and JBL has refined the concept with better battery life and more reliable wireless connections.

Making Your Decision

Go with the Polk Signa S4 if:

You're working with a tighter budget but don't want to compromise on modern features like Dolby Atmos. The system works particularly well if you watch a lot of streaming content (Netflix, Disney+, Amazon Prime all have extensive Atmos libraries) and if dialogue clarity is important to you. It's also ideal if you prefer a simple, clean setup without multiple components to manage.

The Atmos effects genuinely work well in most rooms, and at $299, it's hard to find better value for a system that includes this technology. If you're upgrading from TV speakers, the improvement will be dramatic and immediately noticeable.

Choose the JBL Bar 5.1 if:

You have a larger room and want the most immersive surround sound experience possible from a soundbar system. The physical rear speakers create a more consistent and enveloping sound field than virtual surround processing can achieve. The higher price is justified by the more powerful bass, better music performance, and comprehensive connectivity options.

This system also makes more sense if you frequently host movie nights or if audio quality is a priority for your home entertainment setup. The flexibility of the detachable surrounds means you can adapt the system to different situations – use it as a simple soundbar for daily TV watching, then deploy the full surround setup for special occasions.

The Bottom Line

Both the Polk Audio Signa S4 ($299) and JBL Bar 5.1 ($599.95) represent excellent values in their respective price categories, but they serve different needs and preferences. The Polk delivers remarkable technology at an accessible price point, making Dolby Atmos available to people who previously couldn't afford it. The JBL provides a more comprehensive and powerful audio experience that justifies its higher cost through superior performance and flexibility.

Your choice ultimately comes down to your room size, budget, and what type of content you watch most. Either way, you'll be getting dramatically better audio than what your TV can provide on its own – and that's really the most important upgrade you can make to your home entertainment experience.

Polk Audio Signa S4 Dolby Atmos Soundbar with Wireless Subwoofer Deals and Prices

JBL Bar 5.1 Surround Soundbar with Wireless Subwoofer Deals and Prices