Amazon Fire TV Soundbar Plus vs LG S70TR: Which Budget Soundbar Delivers Better Home Theater Audio?

Shopping for a budget soundbar can feel overwhelming, especially when you're trying to decode marketing terms like "5.1.1 channels" and "virtualized Dolby Atmos." The good news is that both the Amazon Fire TV Soundbar Plus and LG S70TR represent solid options in the $400-450 price range at the time of writing, but they take fundamentally different approaches to delivering cinematic sound in your living room.

After diving deep into user reviews, expert analyses, and technical specifications, it's clear these two systems target different priorities. The Amazon Fire TV Soundbar Plus focuses on ecosystem integration and raw power, while the LG S70TR emphasizes authentic surround sound technology and modern gaming features. Let's break down what really matters when choosing between them.

Understanding Modern Budget Soundbars

Before we compare specifics, it's worth understanding what budget soundbars in this price range are trying to accomplish. These systems aim to transform your TV's thin, underwhelming built-in speakers into something approaching a movie theater experience—without requiring you to run speaker wires throughout your room or spend thousands on a premium setup.

The key considerations boil down to a few critical areas: how well they create an immersive soundscape that makes you feel surrounded by audio, whether they can handle modern gaming consoles without audio lag, how they integrate with your existing TV and streaming devices, and crucially, whether they deliver enough bass impact to make action movies feel visceral rather than flat.

Both the Amazon Fire TV Soundbar Plus and LG S70TR launched in the 2023-2024 timeframe, representing the current generation of budget soundbar technology. This timing matters because it means both systems were designed with modern 4K gaming, streaming services, and the latest audio formats in mind—though as we'll see, they implement these features very differently.

The Channel Configuration Showdown: 5.1 vs 5.1.1

The most fundamental difference between these systems lies in their channel configuration, which determines how they create surround sound. The Amazon Fire TV Soundbar Plus uses a 5.1 setup, meaning it has five main audio channels (left, center, right, left surround, right surround) plus one subwoofer channel for bass. The LG S70TR adds that extra ".1" with its 5.1.1 configuration, including a dedicated height channel that fires sound upward toward your ceiling.

This distinction matters more than you might expect. When the LG S70TR plays a Dolby Atmos movie scene where a helicopter flies overhead, its up-firing speakers physically bounce sound off your ceiling to create the illusion that audio is coming from above. You genuinely hear that helicopter pass over your head in three-dimensional space. The Amazon Fire TV Soundbar Plus, lacking dedicated height speakers, relies on digital processing to simulate this effect through its side-firing speakers—a technique called virtualization.

Based on our research into user experiences, the difference is immediately noticeable. The LG S70TR creates what reviewers consistently describe as a more convincing "dome" of sound, where ambient effects like rain, aircraft, or falling debris seem to occupy specific positions around and above the listener. The Amazon Fire TV Soundbar Plus, while still impressive compared to TV speakers, tends to keep most sound effects locked to a horizontal plane around ear level.

Audio Quality: Where Processing Power Meets Physics

Digging into the audio quality reveals interesting tradeoffs between these approaches. The Amazon Fire TV Soundbar Plus compensates for its virtualized height effects by packing more raw power into its lateral speakers and subwoofer. User reviews consistently praise its dialogue clarity, particularly its dedicated center channel that makes movie conversations easy to follow even during explosive action sequences.

However, several detailed reviews point out that the Amazon Fire TV Soundbar Plus suffers from what audio engineers call "imaging gaps"—spaces in the stereo field where panning sounds (like a car driving from left to right across the screen) can seem to disappear momentarily. This creates a less cohesive soundscape that some users describe as feeling "disconnected" compared to higher-end systems.

The LG S70TR takes a more sophisticated approach with its AI Sound Pro technology. This feature analyzes incoming audio in real-time and automatically adjusts the sound balance based on what type of content you're watching. When it detects dialogue-heavy scenes, it reduces bass levels and enhances midrange frequencies to improve speech clarity. During action sequences, it opens up the dynamic range to let explosions and sound effects hit with full impact.

This adaptive processing makes a meaningful difference in daily use. Rather than constantly reaching for the remote to adjust settings between Netflix shows and action movies, the LG S70TR handles these transitions automatically. Users report this creates a more consistent and engaging experience, especially for households that watch varied content throughout the day.

Gaming Performance: The Modern Console Challenge

Gaming performance has become a critical consideration for soundbars, especially as PlayStation 5 and Xbox Series X consoles push 4K gaming at higher frame rates. This is where the generational differences between these systems become most apparent.

The LG S70TR was designed specifically with modern gaming in mind, supporting Variable Refresh Rate (VRR) and Auto Low Latency Mode (ALLM) up to 120Hz. VRR eliminates screen tearing by synchronizing the soundbar's audio processing with your console's variable frame rates, while ALLM automatically switches to the lowest possible audio delay when gaming mode is detected. For competitive gaming or fast-paced action games, this translates to audio that stays perfectly synchronized with on-screen action.

Our research into gaming forums and user reviews reveals that the Amazon Fire TV Soundbar Plus struggles significantly in this area. Multiple users report noticeable audio-video sync issues when gaming, where sound effects lag behind the visual action by enough to be distracting. While most modern TVs include A/V sync features that can compensate for this during movie watching, gaming requires the lowest possible latency that the Amazon system simply doesn't deliver.

For households where gaming is a primary entertainment activity, this difference alone could be decisive. The LG S70TR delivers the responsive audio experience that modern gaming demands, while the Amazon Fire TV Soundbar Plus feels dated in this crucial area.

Smart Features and Ecosystem Integration

Both systems offer smart features, but they take completely different philosophical approaches. The Amazon Fire TV Soundbar Plus doubles down on Amazon ecosystem integration, offering seamless control through Fire TV remotes and on-screen menu integration. If you're already invested in Amazon's streaming ecosystem with Fire TV devices, this integration feels natural and intuitive.

However, the Amazon Fire TV Soundbar Plus lacks many features that have become standard in modern soundbars. There's no dedicated smartphone app for advanced settings, no firmware update capability to add new features over time, and no room correction technology to optimize sound for your specific space. The system essentially offers the same feature set out of the box that it will have years later.

The LG S70TR represents a more forward-thinking approach. Its smartphone app allows detailed EQ customization, and over-the-air firmware updates mean the system can gain new capabilities and audio processing improvements over time. The room correction feature automatically analyzes your space and adjusts audio output to compensate for room acoustics—a feature typically found in much more expensive systems.

For LG TV owners specifically, the LG S70TR offers a unique advantage through its WOW Orchestra technology. This feature uses both your LG TV's built-in speakers and the soundbar simultaneously, creating an expanded soundstage that's wider than what either device could achieve alone. Multiple user reviews describe this as creating a more enveloping audio experience that makes the sound seem to extend well beyond the physical boundaries of the TV screen.

Bass Performance and Room Considerations

Bass performance represents another area where these systems make different tradeoffs. The Amazon Fire TV Soundbar Plus includes a larger 10-inch subwoofer that can deliver more raw low-frequency power. In larger rooms or for users who prioritize maximum impact from explosions and music, this extra bass output can make a meaningful difference.

However, several detailed reviews note that this larger subwoofer can be somewhat overwhelming in smaller spaces, and the bass response is described as "one-note" compared to more refined systems. The powerful low-end can muddy dialogue during action scenes if not carefully balanced with the remote's bass adjustment controls.

The LG S70TR uses a more compact 7-inch subwoofer with a 3-inch rear port, designed for optimal performance in small to medium rooms up to about 400 square feet. While it may not shake the walls like the Amazon system, user reviews consistently praise its more refined and musical bass response that integrates better with the main speakers. The AI processing also helps manage bass levels automatically, preventing the common problem of overwhelming low-end during dialogue scenes.

Value Proposition and Long-Term Investment

At the time of writing, both systems fall within a similar price range, making the value comparison particularly interesting. The LG S70TR typically sells for slightly less while offering more advanced features, creating what appears to be a clear value advantage on paper.

However, value calculations need to consider long-term satisfaction and use case alignment. The Amazon Fire TV Soundbar Plus delivers a complete 5.1 surround system out of the box with minimal setup complexity. For users who prioritize simplicity and Fire TV ecosystem integration, this straightforward approach has merit despite the higher price.

The LG S70TR offers better future-proofing through its firmware update capability, modern gaming features, and more sophisticated audio processing. Users investing in this system are likely to remain satisfied longer as their entertainment needs evolve and as streaming services continue to improve their audio quality.

Our analysis suggests that the LG S70TR delivers superior value for most users, but there are specific scenarios where the Amazon Fire TV Soundbar Plus might justify its premium.

Home Theater Performance in Real-World Use

For dedicated home theater use, the differences between these systems become more pronounced. The LG S70TR's authentic height channels create a more convincing cinematic experience, particularly with properly mixed Dolby Atmos content from services like Disney+ or Netflix's premium offerings. The AI processing also adapts well to the varying audio quality of different streaming services, automatically optimizing poor-quality streams while preserving the full dynamic range of high-quality content.

The Amazon Fire TV Soundbar Plus can still deliver an impressive movie-watching experience, particularly for dialogue-driven content where its strong center channel excels. However, the lack of true height effects means that big-budget action movies with sophisticated sound design won't achieve the same level of immersion.

Both systems handle music streaming competently, though neither is specifically tuned for critical music listening. The LG S70TR's AI processing tends to create a more spacious presentation for music, while the Amazon Fire TV Soundbar Plus's more powerful bass can be appealing for bass-heavy genres.

Making the Right Choice for Your Setup

Based on our comprehensive research and analysis of user experiences, the LG S70TR emerges as the better choice for most buyers. Its combination of authentic Dolby Atmos height effects, modern gaming capabilities, AI optimization, and competitive pricing creates a compelling package that should satisfy users for years to come.

The Amazon Fire TV Soundbar Plus makes sense in specific scenarios: if you're deeply invested in Amazon's Fire TV ecosystem and value seamless integration above all else, if you have a particularly large room that benefits from its more powerful subwoofer, or if you prioritize the simplest possible setup process over advanced features.

For gaming households, the choice is clear—the LG S70TR's modern gaming features make it the only viable option for satisfying PlayStation 5 or Xbox Series X use. Similarly, LG TV owners gain significant additional value through the WOW Orchestra feature that creates a unique expanded soundstage.

The LG S70TR also represents a better long-term investment thanks to its updateable firmware and more sophisticated feature set. As streaming services continue to improve their audio quality and as new audio formats emerge, this system is better positioned to take advantage of these improvements.

For most buyers shopping in this price range, the LG S70TR delivers better performance, more advanced features, and superior value. Unless you have specific needs that favor the Amazon Fire TV Soundbar Plus's approach, the LG system should provide years of satisfying home theater audio.

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