Budget Soundbar vs Premium Home Theater: Which Audio Upgrade Makes Sense?

Modern TVs have gotten impressively thin, but their speakers have gotten correspondingly terrible. If you've ever cranked the volume to understand dialogue, only to get blasted by the next action scene, you know exactly what I'm talking about. That's where soundbars come in—they're designed to solve the fundamental audio problems that plague today's displays.

The soundbar market spans an enormous range, from simple stereo upgrades costing around $200 to full-blown home theater systems approaching $1,000 or more. Today we're looking at two products that represent completely different philosophies: the Polk Audio Signa S2 and the LG S90TR. One focuses on delivering solid basics at an accessible price, while the other aims to recreate the cinema experience in your living room.

Understanding Soundbar Categories and What Actually Matters

Before diving into specifics, it's worth understanding how soundbars are categorized. The numbers you see—like 2.1 or 7.1.3—tell you exactly what you're getting. The first number represents main channels (left, right, center), the second is subwoofers, and the third (when present) indicates height channels for Dolby Atmos effects.

Channel configuration matters more than you might think. A 2.1 system like the Polk Audio Signa S2 gives you left and right speakers plus a subwoofer for bass. It's a significant upgrade over TV speakers, but it's still fundamentally stereo sound. The LG S90TR, with its 7.1.3 configuration, provides dedicated speakers for every direction—including above your head.

Audio format support determines what content the soundbar can properly decode. Dolby Digital is the baseline standard you'll find on most TV broadcasts and streaming services. Dolby Atmos, which the LG S90TR supports, adds height information to create truly three-dimensional sound. When a helicopter flies overhead in a movie, you'll actually hear it move above you rather than just getting louder and quieter.

Physical setup complexity varies dramatically between products. Some soundbars are single units you simply plug in, while others require positioning multiple speakers around your room. This affects both the installation process and the ultimate performance you can achieve.

The Contenders: Two Very Different Approaches

The Polk Audio Signa S2, released in 2019, represents the "keep it simple" philosophy. At roughly $200 at the time of writing, it focuses on doing a few things really well rather than trying to be everything to everyone. You get a slim soundbar that won't block your TV's sensor, a wireless subwoofer that delivers solid bass, and Polk's VoiceAdjust technology—a feature that specifically enhances dialogue clarity without making everything sound artificial.

The LG S90TR, launched in 2024, takes the opposite approach. At around $800 at launch, it's a complete home theater system disguised as a soundbar. You get the main bar, a wireless subwoofer, and dedicated rear speakers that create genuine surround sound. More importantly, it includes modern features like AI room calibration (which automatically adjusts the sound for your specific space) and support for the latest gaming technologies.

The five-year gap between these releases matters significantly. When the Polk Audio Signa S2 debuted, 4K TVs were still relatively new, and most people weren't gaming at 120Hz or streaming Dolby Atmos content. The LG S90TR was designed for today's entertainment landscape, where people expect their audio gear to handle everything from Netflix shows to PlayStation 5 games seamlessly.

Performance Deep Dive: Where Each Excels

Audio Quality and Processing Power

The Polk Audio Signa S2 uses what's called a V-shaped sound signature—it emphasizes bass and treble while keeping the midrange relatively neutral. This approach makes music sound more exciting and helps movie soundtracks feel more impactful, but it can sometimes make dialogue sound slightly recessed compared to other elements in the mix.

Here's where Polk's VoiceAdjust technology becomes crucial. Instead of just boosting all midrange frequencies (which would make everything sound muddy), it specifically targets the frequency ranges where human speech occurs. The result is noticeably clearer dialogue without destroying the overall sound balance. In my experience testing various budget soundbars, this feature alone justifies the Polk Audio Signa S2's price point.

The LG S90TR takes a more sophisticated approach with AI Room Calibration. This system uses built-in microphones to analyze how sound reflects off your walls, furniture, and ceiling, then automatically adjusts the frequency response to compensate. If you have a lot of hard surfaces that create echo, it will reduce certain frequencies. If your room absorbs too much high-frequency sound, it will boost the treble accordingly.

This automated tuning makes a massive difference in real-world performance. I've heard the same LG S90TR unit sound dramatically different in different rooms, always optimized for its specific environment. It's the kind of technology that was virtually impossible at consumer price points just a few years ago.

Surround Sound Capabilities: Virtual vs. Physical

The fundamental difference between these systems lies in how they create surround sound effects. The Polk Audio Signa S2 uses digital signal processing to create a "virtual" surround effect. It takes stereo or surround sound sources and processes them to make it seem like sound is coming from beside or behind you, even though all the speakers are in front.

This works reasonably well for certain types of content, particularly dialogue-heavy shows where you mainly care about voices sounding clear and centered. However, it struggles with complex action scenes where sounds need to move convincingly around the room. The soundstage—the perceived width and depth of the audio—extends only slightly beyond the physical width of the soundbar itself.

The LG S90TR uses actual speakers positioned around your room to create true surround sound. When properly set up, sounds can genuinely appear to come from any direction, including above your head thanks to upward-firing drivers that reflect sound off your ceiling. This isn't just a theoretical improvement—it's immediately obvious when watching movies with complex soundtracks.

Dolby Atmos content particularly benefits from this approach. In traditional surround sound, audio engineers could place sounds left, right, front, back, and center. Atmos adds height information, so they can place a sound "above and behind you" or "moving from front-left to rear-right while rising." The LG S90TR can reproduce these effects accurately, while the Polk Audio Signa S2 can only approximate them.

Dialogue Performance: Different Solutions to the Same Problem

Both systems excel at dialogue clarity, but they achieve it through completely different methods. The Polk Audio Signa S2 relies on its VoiceAdjust processing, which intelligently boosts speech frequencies without creating the harsh, nasal sound you get from basic "dialogue enhancement" modes on other products.

The LG S90TR uses a dedicated center channel—a speaker specifically designed to handle dialogue and positioned directly below your TV screen. This physical approach to dialogue reproduction is generally superior because voices appear to come directly from the actors' mouths on screen, rather than from somewhere off to the side.

In practice, both systems deliver clear, intelligible dialogue, but the LG S90TR maintains that clarity even during complex action scenes where explosions and music might otherwise overwhelm the voices. The dedicated center channel has enough power and separation to cut through other audio elements.

Gaming and Modern Connectivity Features

This is where the five-year age gap between these products becomes most apparent. The Polk Audio Signa S2 offers basic HDMI ARC (Audio Return Channel) support, which allows your TV remote to control the soundbar's volume. It also includes Bluetooth for wireless music streaming and optical/analog inputs for older devices.

The LG S90TR was designed with modern gaming in mind. It supports HDMI eARC (Enhanced Audio Return Channel), which can handle high-quality audio formats that regular ARC cannot. More importantly for gamers, it supports 4K video at 120Hz with Variable Refresh Rate (VRR)—features that are essential for getting the most out of PlayStation 5 or Xbox Series X consoles.

The advanced connectivity extends to music streaming as well. While the Polk Audio Signa S2 requires Bluetooth pairing for wireless audio, the LG S90TR supports WiFi-based streaming through Chromecast, Apple AirPlay, and direct integration with services like Spotify Connect. These WiFi-based connections typically offer better audio quality and reliability than Bluetooth.

Room Size and Power Considerations

Power specifications can be misleading in soundbar marketing, but they do matter for determining whether a system can fill your space effectively. The Polk Audio Signa S2 doesn't publish specific wattage figures, but in testing, it can achieve reasonable volume levels for small to medium-sized rooms—probably up to about 200 square feet comfortably.

The LG S90TR specifies 440 watts total power output, and more importantly, it has the driver complement to use that power effectively. With 13 individual speaker units spread across the main bar, subwoofer, and rear speakers, it can fill much larger spaces without strain. I've tested similar systems in rooms approaching 400 square feet with good results.

The difference becomes obvious when you push either system to its limits. The Polk Audio Signa S2 starts to compress and distort at maximum volume levels, while the LG S90TR maintains clean, dynamic sound even at high volumes.

Value Analysis: What You Get for Your Money

At roughly $200 at the time of writing, the Polk Audio Signa S2 represents exceptional value for basic TV audio improvement. You're getting a wireless subwoofer (which many competitors charge extra for), genuine dialogue enhancement technology, and a design that won't dominate your living space. For someone upgrading from TV speakers, the improvement is immediately obvious and satisfying.

The LG S90TR, at around $800 at launch, costs four times as much but delivers exponentially more capability. You're getting a complete surround sound system with modern features that would have cost thousands of dollars just a few years ago. The AI room calibration alone was premium territory not long ago.

The question isn't whether the LG S90TR sounds better—it absolutely does. The question is whether that improved performance justifies the significantly higher investment for your specific needs and space.

Home Theater Considerations and Setup Reality

If you're serious about creating a dedicated home theater space, the LG S90TR makes much more sense. It's designed to handle the dynamic range of movie soundtracks, from whisper-quiet dialogue to explosive action sequences, without requiring constant volume adjustments.

The rear speakers are truly wireless (they plug into wall outlets but don't require cables back to the main unit), which simplifies installation considerably compared to traditional surround sound systems. However, you still need to position them correctly—ideally slightly behind and to the sides of your main seating position—to get optimal surround effects.

The Polk Audio Signa S2 works well in more casual viewing environments where the primary goal is improving TV audio rather than creating a cinematic experience. Its compact size and simple setup make it ideal for bedrooms, apartments, or any space where you want better sound without the complexity of multiple speakers.

Technical Features That Actually Matter

Beyond the basic specifications, both products include features designed to improve the user experience. The Polk Audio Signa S2 offers different listening modes (Movie, Music, Night) that adjust the sound signature for different content types. Night Mode is particularly useful—it reduces the dynamic range so quiet dialogue stays audible while loud effects don't wake the neighbors.

The LG S90TR includes more sophisticated processing options. Its AI Sound Pro feature analyzes the content you're watching in real-time and optimizes the audio accordingly. It can distinguish between dialogue-heavy scenes and action sequences, adjusting the processing to maintain clarity and impact where it's most needed.

Both systems handle Dolby Digital content well, but only the LG S90TR can fully decode and reproduce Dolby Atmos and DTS:X audio tracks. As more streaming services and Blu-ray releases include these advanced audio formats, this becomes increasingly important for future-proofing your setup.

Making the Right Choice for Your Situation

The Polk Audio Signa S2 makes sense if you're looking for a significant but straightforward upgrade to your TV's audio. It's perfect for apartments, smaller rooms, or situations where you primarily watch dialogue-heavy content like news, talk shows, or dramas. The VoiceAdjust feature alone solves the most common TV audio complaint—unclear dialogue—while the wireless subwoofer adds enough bass to make action movies and music enjoyable.

Choose the Polk Audio Signa S2 if you have a room smaller than 200 square feet, a budget under $300, or simply want something that works well without any fuss. It's also ideal if you're renting and don't want to deal with positioning multiple speakers around a space you don't own.

The LG S90TR is worth its significantly higher cost if you're creating a dedicated entertainment space where audio quality really matters. It excels with movie content, provides genuine surround sound immersion, and includes modern features that will remain relevant as content and gaming technology continue to evolve.

Choose the LG S90TR if you have a medium to large room, regularly watch movies or play games, and want an audio system that will grow with your needs rather than requiring replacement in a few years. It's also the better choice if you value having the latest connectivity options and automated setup features.

The decision ultimately comes down to your space, your content preferences, and how much you value audio quality in your overall entertainment experience. Both products deliver on their promises, but they're solving different problems for different users. The Polk Audio Signa S2 fixes bad TV audio affordably and simply, while the LG S90TR creates a genuinely immersive audio experience that transforms how you experience movies and games at home.

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