Compare Sony Inzone E9 vs EarFun Air Pro 4 Plus

Sound quality depends heavily on the use case. Competitive games get repeated praise for clarity and detail, but music and cinematic titles often sound flat, hollow, bass-light, or clinical; a handful of listeners instead find the tuning rich and enjoyable.

Sound quality is the product's strongest consensus win, with rich, detailed and unusually mature performance for the price. A few reviewers wanted more refinement, but many thought it competed surprisingly close to much more expensive earbuds.

Depth cues are strong enough to distinguish whether action is far away, mid-range, close, or nearby. Spatial processing can add further depth, although it may trade some tonal naturalness for competitive information.

Soundstage depth is weaker than width. Reviewers described the presentation as relatively flat or merely adequate in front-to-back depth even when the overall stage remained spacious.

One reviewer specifically praised the wired path for avoiding data loss. The direct connection also supports the E9’s low-latency competitive focus.

Lossless-oriented codec support is impressive for a budget model, but reviewers were careful about its limits. It can improve the available wireless quality with compatible devices without turning Bluetooth into truly wired lossless playback.

Bass is the most divisive part of the tuning. Many find it restrained, hollow, or lacking punch for music and cinematic games, while a smaller group likes the cleaner low end or gets fuller bass with the right seal, dongle, or EQ.

Bass is one of the sound profile's strengths: deep, punchy and generally well controlled without swamping the mids. A minority found the default low end a little thick or less forceful than expected.

Tonal accuracy is disputed. One reviewer hears honest, natural timbres, while another considers the dongle-driven tuning far from accurate and overly shaped for gaming.

The default tuning is usually described as balanced, warm and natural rather than aggressively V-shaped. A few reviewers heard too much brightness or bass, but the overall frequency balance earned positive marks.

Positional accuracy is the E9’s defining strength: most reviewers can locate footsteps, gunfire, distance, and movement with exceptional precision. A small minority strongly disagrees, but the dominant pattern is excellent competitive directionality.

Imaging is good for music, with convincing left-right placement and useful spatial cues. For competitive gaming, however, at least one reviewer found direction and distance too imprecise for pinpoint positioning.

The wired connection was praised for eliminating latency and audio lag. That direct path suits competitive play where timing matters.

Low-latency and gaming performance is generally strong. Game Mode often brought audio close to the action, although Bluetooth still leaves enough delay or directional imprecision to limit competitive use.

Spatial processing is usually praised for improving direction, distance, and immersion, and several users consider it exceptionally accurate. A few find it filtered, muffled, or less natural, so its value depends on the listener and mode.

There is no dedicated spatial-audio processing, but reactions to that omission are mostly mild. Some reviewers missed the feature, while others felt the natural width and depth made artificial spatial modes unnecessary.

Passive isolation is one of the E9’s clearest strengths, especially with the dedicated isolation tips and a good seal. Most users report substantial blocking of voices, keyboards, and room noise without active noise cancellation.

Passive isolation is a useful foundation for ANC. Reviewers who discussed the seal found it capable of blocking a fair amount of outside sound even before electronic cancellation is applied.

The E9 generally presents a wide, precise stage that helps locate sounds across the field. It is more tactical than atmospheric, prioritizing positional awareness over a lush sense of musical space.

The stage is generally wide and spacious for budget earbuds, helping music feel open and immersive. A few reviewers still found it narrower than premium alternatives or wider than it is deep.

The USB-C audio box is widely seen as a valuable part of the package because it unlocks Hub features, spatial processing, EQ, and broader device connections. Some dislike needing it for the best experience, and one listener strongly criticized its stock tuning.

There is no low-latency wireless dongle, which limits suitability for serious competitive gaming. Game Mode helps substantially, but Bluetooth remains the underlying connection.

The matte finish hides fingerprints very well. It keeps the understated shells looking cleaner during regular handling.

The matte finish can resist fingerprints well, but the case is not equally resistant to cosmetic wear. One reviewer specifically found it easy to scratch.

The included case is one of the most consistently liked extras, with useful organization for the earbuds and dongle. A minority finds it bulkier than necessary, but most consider it practical for travel or tournaments.

The charging case is usually considered compact, practical and pocketable, but opinions on its feel are mixed. Some praised its sturdy design, while others found it slippery, awkward to open, or less premium than the earbuds' performance suggests.

The USB-C audio box worked successfully with Android in hands-on use, including a Samsung Galaxy phone. Android users can get audio through the dongle even though the full Hub app experience remains PC-focused.

Android use is a good fit, especially for access to Fast Pair and higher-resolution codec options. Reviewers who tested Android generally found pairing and app support straightforward.

The compact wired IEM format is easy to stow and much easier to travel with than a full headset. The protective case further improves portability for tournaments and handheld gaming.

Portability is good thanks to the light earbuds and generally compact case. A few reviewers thought the case could be slimmer, but it remains easy to carry in most pockets or bags.

One owner liked the overall unboxing but criticized the paper ear-tip holder as flimsy and cheap. The packaging itself is therefore less convincing than the included case and accessories.

Packaging is neat and straightforward rather than luxurious. Reviewers found the unboxing organized and appropriate for the price.

Treble opinions are mixed but lean critical. Some hear crisp, detailed highs, while many find the top end subdued, lacking brilliance, or—at the other extreme—too sharp and fatiguing.

Treble is usually clean, detailed and better resolved than on earlier EarFun models, helped by the balanced-armature driver. Depending on listener and volume, it can also sound too bright, too safe or slightly hot.

Volume feedback is mixed: one reviewer calls the E9 detailed and loud, another says it is loud enough, while one customer finds the output too low. Output level may therefore depend on source and personal preference.

Volume output is strong enough for demanding listening. The reviewer who assessed it directly found useful loudness around mid settings and plenty of headroom above that.

The E9 works across a wide mix of PCs, consoles, phones, and other USB-C or 3.5mm devices. The hardware is broadly compatible, but Windows has the strongest software support and console users lose some tuning options.

The earbuds work across a broad mix of phones, computers and portable gaming devices, and reviewers generally had few compatibility problems. Android gets the richest codec options, but basic use remains strong across platforms.

Separation is a standout competitive strength. Reviewers repeatedly say individual footsteps, voices, effects, and layers remain distinguishable even in dense firefights or busy mixes.

Instrument separation is a major sound-quality strength for the price. Reviewers repeatedly heard distinct instruments and vocals with good left-right organization even in busier mixes.

Midrange performance is generally strong, with dialogue, voices, footsteps, and other critical cues sounding clean and forward. One review finds the mids somewhat hollow or overemphasized, but clarity remains a core competitive advantage.

Midrange performance is generally clear, full and natural, with vocals and instruments staying distinct from the bass. A few reviewers found the mids recessed, thin or less energetic, making this less unanimous than the bass praise.

The E9 is generally considered well equipped, with multiple tip sets, a USB-C audio box, case, and small cable-management extras. The bundle helps it feel ready for PC and travel use out of the box.

The accessory package is simple but useful, especially the unusually broad selection of ear-tip sizes. Reviewers liked having enough fit options without unnecessary extras.

The included USB-C adapter broadens device support and can make the wired E9 convenient with modern phones and computers. It is useful, though some older PCs may still need another adapter.

USB-C charging is a welcome practical convenience, especially because it sits alongside wireless charging rather than replacing it.

The E9 earns strong praise when judged as a specialized competitive-FPS tool, especially for positioning, isolation, and comfort. Satisfaction drops sharply among listeners wanting one pair for music, cinematic games, chat, or a warmer all-purpose sound.

Overall satisfaction is very high: most reviewers consider these among the strongest sub-$100 earbuds and several gave unusually enthusiastic recommendations. The few reservations center on ANC, calls and budget-feeling materials rather than the core listening experience.

Preset quality is mixed. Some competitive profiles help emphasize useful cues, while others add little, sound unnatural, or are considered excessive compared with simply using a custom EQ.

The large preset library gives plenty of quick tuning options, but quality and usability are mixed. Some reviewers liked the choice while others found the presets excessive, poorly organized, or less useful than the manual EQ.

The earhook design usually keeps the lightweight buds securely in place, even during long sessions. One owner reported earpiece parts coming off in the ear, making stability less uniformly positive than comfort.

Physical stability is good for walking, running and workouts when the correct tips are used. Reviewers generally found the buds secure enough to stay in place through movement.

Sony’s generous mix of tip sizes and styles is consistently praised. The range makes it easier to find a secure seal and choose between general-use and stronger-isolation tips.

The broad ear-tip selection helps accommodate different ear sizes and was repeatedly useful for achieving a secure seal. Reviewers with small ears in particular benefited from the extra sizing choices.

The earbuds are repeatedly praised for feeling very light. Their low weight helps reduce awareness and fatigue during long sessions.

Low weight contributes meaningfully to comfort. Several reviewers said the earbuds are light enough to forget during long listening or workouts.

The E9’s look is understated, compact, and functional rather than flashy. Most like the subtle, lightweight styling, though some find the buds plain or parts of the construction visually cheap.

The familiar stem design is functional and often described as attractive or understated, but it does not hide the budget materials. Several reviewers liked the clean look while others called it plasticky or generic.

Most users can find a secure, comfortable seal thanks to the broad tip selection, and a good seal can materially improve bass and isolation. Fit is still personal, with some needing aftermarket or alternate tips to get comfortable.

Fit is generally secure and comfortable, with the revised oval tips helping many reviewers get a good seal. Individual ear shape still matters, and a few testers needed to experiment with sizes or experienced fit-related sensor quirks.

Comfort is a major strength for most users, with many wearing the E9 for several hours without irritation or fatigue. A smaller group reports stiff earhooks, tip sensitivity, or ear discomfort after extended sessions.

Long-wear comfort is consistently strong. The light earbuds sit comfortably for multi-hour listening, commuting, workouts and gaming without the pressure or fatigue some reviewers experience with other ANC buds.

Build impressions range from excellent to concerning. Several owners describe the hardware as high quality, but others report cheap-feeling plastic, a defective first unit, earpiece issues, or an immediate failure.

Build quality is solid for the price but visibly budget-oriented. Reviewers generally trust the earbuds' durability while noting plasticky materials and a few case or hinge details that feel less premium.

Value is highly use-case dependent. Dedicated competitive players often consider the price justified by positioning, comfort, accessories, and software, while generalists and several owners think $150 is too much for weak versatility or no microphone.

Value for money is the strongest point of agreement. Reviewers repeatedly say the combination of sound, battery life, codecs and customization delivers far more than the sub-$100 price suggests.

Replacement tips should be easy to source because the included styles come from Sony’s established tip lines. That makes long-term replacement less troublesome.

Swapping the silicone tips is straightforward. The reviewer who directly assessed replacement found the process very easy.

Setup is usually straightforward, from plug-and-play use to the clean single-screen Hub interface. Complexity rises when users juggle the dongle, separate microphone, per-app profiles, or platform-specific limitations.

Initial pairing and everyday setup are generally easy, particularly with Fast Pair. The main usability complaint is the large number of ANC and tuning options, which can make the software feel more complicated than necessary.

The 10-band EQ and profile controls are useful for tailoring the E9, especially when adding bass or emphasizing competitive cues. Results are limited by the underlying tuning, and customization is most complete on Windows through the dongle.

Sound customization is a standout feature. The 10-band EQ and personal profiles can meaningfully reshape bass, mids and treble, and several reviewers used them to correct aspects of the stock tuning they disliked.

INZONE Hub is generally easy to use and adds useful profiles, EQ, spatial sound, and app-sync features. The main frustration is platform support: Windows gets the full experience while consoles, Mac, Linux, and mobile lose customization.

The EarFun Audio app is widely praised for its depth, useful layout, and extensive controls. A few reviewers found parts of it unstable or overly busy, but customization is a consistent strength.

Noise cancellation is the main point of disagreement. Some reviewers found it impressively effective on steady low-frequency noise, while several others called it average, confusing to configure, or clearly behind the strongest rivals.

Microphone noise reduction works well in ordinary indoor or moderately noisy settings, but heavy wind and busy streets expose its limits. Background suppression can also make the user's voice quieter or less stable.

AI translation drew mixed reactions. It can handle basic exchanges reasonably well, but reviewers also found the workflow slow or awkward and questioned how accurately the feature is marketed.

aptX support is repeatedly treated as unusually generous at this price. Reviewers value having it alongside other high-resolution options, though the audible advantage depends on the source device and settings.

High-resolution wireless playback is a notable value advantage, with reviewers appreciating access to advanced codecs at a low price. The improvement over standard AAC can be subtle, but compatible sources can extract extra detail.

The long cable is usually a strength for desktop PC setups and is often described as practical or well made. It can become cumbersome on controllers or phones, and a few users disagree on whether its length suits their setup.

Cable replaceability gets mixed reports and mixed reactions. Where reviewers describe the cable as detachable, they appreciate easier replacement but note connector limitations; others describe their unit as fixed and see that as a durability drawback.

The Find Headphones function is a useful practical extra for locating a misplaced bud. Reviewers who mentioned it treated the audible locator as a welcome feature in an already deep app.

Headwear compatibility has a specific caveat: one reviewer found that wearing a beanie could accidentally trigger the touch controls and pause playback.

The lack of a built-in microphone is a recurring drawback. Competitive players with a separate mic may not care, but headset users who expect one-device game chat often see it as an inconvenience or value problem.

LDAC is valued for giving Android users another high-bitrate option and sometimes a little more body or detail. Its drawback is higher battery use and, in some setups, more connection instability or reduced multipoint flexibility.

Clarity at extreme volume is only middling. Reviewers noted that treble can become hot or more aggressive near the top of the volume range even though normal listening stays controlled.

Wear detection is inconsistent across reviewers. Some found it responsive and improved, while others experienced false pauses or fit-related detection problems.

Touch controls are customizable and usually responsive, but they are not universally loved. Some reviewers found them sensitive, fiddly or less satisfying than pressure-based controls.

Transparency mode is useful for conversations and basic awareness, but it is rarely described as class-leading. Reviewers commonly called it decent or good enough, with less natural amplification than premium rivals.

The IP55 protection is widely viewed as sufficient for workouts, sweat, rain and everyday outdoor use. Reviewers treat it as a useful durability upgrade, while noting that the earbuds are not meant for submersion.

Auracast is mostly viewed as a welcome future-facing extra rather than an everyday necessity. Reviewers like seeing it at this price even though several had little opportunity to use it.

Codec breadth is exceptional for the price, with reviewers repeatedly praising the unusually complete set of modern wireless audio options. That flexibility is especially valuable for Android users and audio tinkerers.

Multipoint is usually convenient and reliable, with some reviewers calling switching seamless or flawless. A smaller group encountered stutters or instability, particularly when combining two-device use with LDAC.

Firmware support earned positive comments when updates arrived during testing and fixed real issues. Reviewers saw the active update cadence as a reassuring sign that EarFun is still refining the product.

Battery life is one of the clearest strengths, with reviewers repeatedly praising long single-charge endurance and generous case reserves. Higher-bitrate codecs and ANC reduce runtime, but the overall result remains excellent for the class.

Charging is a strong convenience feature thanks to wireless charging and useful quick-charge performance. Reviewers repeatedly liked getting these extras in a budget-priced set.

Bluetooth performance is usually quick and dependable, with easy pairing and few dropouts in normal use. The main caveat is that demanding combinations such as LDAC plus multipoint can introduce instability.

Call quality is good for everyday use, with clear speech in quiet and moderate noise. It is not consistently flagship-level, and several reviewers reported weaker intelligibility or voice stability in wind and very loud surroundings.

Case-hinge confidence is a minor durability concern. Reviewers noted a less-secure lid and wished for a sturdier metal hinge, even though neither described an outright breakage.