FiiO UTWS17 Review

 

Introduction:

FiiO’s UTWS lineup represents one of the most consistent long-term engineering efforts in the Bluetooth IEM adapter category. The UTWS1 arrived as a proof of concept, showing that detachable over-ear hooks with a built-in Bluetooth receiver could convert a wired IEM into a wire-free listening experience without requiring the earphones themselves to be replaced. The UTWS3 added LDAC support and a companion app, the UTWS5 followed with an improved amplifier stage and a stronger codec implementation, and the 2025 revision of the UTWS5 brought wireless charging to the case for the first time. The UTWS17, which FiiO has also brought to market under the commercial name LINK TWS, is the flagship culmination of that development sequence and what FiiO describes as the model that addresses all the major user requests that have accumulated across six years of the product category.

The three headline upgrades the UTWS17 delivers over any previous UTWS model are a move to the Qualcomm QCC5181 flagship chipset with Bluetooth 6.0, the addition of aptX Lossless codec support reaching up to 1.2Mbps wireless bit rate, and contactless wireless charging on the ear hooks themselves rather than only on the charging case. Alongside these sits a dual independent AK4333 DAC configuration, one chip per channel, creating a fully separated HiFi DAC and amplifier circuit that no previous UTWS model attempted to build into the hook housings at this level. The result is a device that FiiO positions as potentially the final chapter of the UTWS series rather than a stepping stone toward a further iteration, and the hardware spec list reads accordingly.

 

Disclaimer:

I would like to thank FiiO for providing the FiiO UTWS17 as a review sample. I am not affiliated with FiiO beyond this review, and these words reflect my true and unaltered opinions about the product.

 

Price & Availability:

The FiiO UTWS17 is priced at $219.99 USD. More information can be found through the link below:

• FiiO UTWS17 True Lossless HiFi Bluetooth Ear Hooks

 

Package & Accessories:

The UTWS17 ships in FiiO’s standard compact accessory-product presentation, with the hooks and case nested in a fitted foam insert and the included connector set arranged beneath them in a small tray. The packaging communicates the product’s identity clearly without theatrical presentation, which suits a device whose value is in its technology rather than its visual impression.

The full package includes:

• 1 pair x FiiO UTWS17 Bluetooth ear hooks
• 1 x charging case with built-in battery indicator display
• 1 x pair MMCX connectors (pre-installed)
• 1 x pair 0.78mm 2-pin connectors
• 1 x USB-C charging cable
• 1 x user manual

The decision to include both MMCX and 0.78mm 2-pin connector sets in the box is the most practically significant packaging choice FiiO made with the UTWS17. Previous UTWS models shipped with a single connector type, which meant buyers had to decide at purchase time which standard their IEM collection used, and anyone with a mix of both needed to buy the alternative set separately. Including both out of the box removes that decision entirely and makes the UTWS17 compatible with the overwhelming majority of the aftermarket IEM market without any additional purchase.

The charging case is the other notable addition to the package compared to earlier models. Beyond its primary function, the case houses a small display that shows the battery level of each hook individually alongside pairing status, replacing the LED indicator system of previous generations with a more readable and informative readout. A USB-C port on the case handles charging the case itself, while the hooks charge contactlessly from the case interior when seated.

 

 

Design & Build Quality:

The UTWS17 hook housings continue FiiO’s established over-ear geometry, wrapping around the upper ear with the hook body positioned behind the auricle and the IEM connector hanging at the lower end, angled to route naturally toward the canal when an IEM is attached. The housings are constructed from a matte-finished polymer, compact enough to sit close to the ear rather than protruding noticeably, and each hook has a small tactile button on the outer face that handles play, pause, skip, and mode switching depending on press pattern.

The most immediately visible change in the UTWS17 relative to earlier UTWS models is the charging contact arrangement on the inner face of each hook, where the pins of the UTWS3 and UTWS5 that mated with the case’s charging connectors have been replaced by a wireless charging coil and a flush contact surface.

The elimination of exposed metal pins removes one of the principal durability concerns about the earlier models: charging pins in a pocket environment are vulnerable to oxidation, debris buildup, and physical deformation in ways that a flush surface simply is not. The contactless charging works reliably within the case, with the hooks seating correctly in either orientation without requiring precise physical alignment.

Connector swapping uses a push-and-twist mechanism that is identical in principle to the system introduced in the UTWS5. Removing one connector set and installing the other takes roughly thirty seconds per side, requires no tools, and the connectors seat and lock without play or looseness once correctly installed.

The MMCX connectors use a standard rotating socket that accepts any MMCX-terminated IEM cable, and the 0.78mm 2-pin connectors fit the recessed and flush housing styles that cover the majority of the 2-pin IEM market. Both sets were tested across all three IEMs used for this review, and all six connections were secure and contact-consistent throughout.

Build quality across the review units was consistent and appropriate for the price, with no flex in the hook body, firm button travel with a clear click, and no creak or rattle from any component during normal use. The hooks are light enough to remain in place during walking and moderate head movement without the IEM weight pulling them forward, which matters in a product specifically designed for wire-free use during mobile activities.

 

Charging Case & Battery Life:

The UTWS17’s power system prioritizes practical daily endurance while refining the overall charging experience. Each ear hook carries a 60 mAh cell and delivers roughly eight hours of continuous playback under standard codecs like AAC. Higher bitrate codecs such as LDAC or aptX Lossless shorten that figure to around 5 to 6 hours of continuous playback, as expected, yet the resulting runtime remains sufficient for a full day of mixed listening without constant monitoring of residual charge.

The more noticeable advance sits inside the charging case. FiiO increased the internal battery capacity to 1350 mAh while preserving the same external dimensions, giving the case substantially more reserve energy. In practice this allows 4 to 5 full recharges of the hooks, bringing the total combined playback time up to approximately 30 hours before the case itself needs attention. This significantly reduces the likelihood of running short during extended travel or all day use.

Hook charging is fully contactless. Once seated, the units draw power wirelessly, removing the exposed metal contacts that previously invited oxidation and debris accumulation. The case itself charges through a standard USB C port. A compact front facing display reports the remaining charge of each hook individually together with pairing status, offering a clearer and more useful readout than earlier LED based systems. The combination of higher case capacity, contactless hook charging, and improved status information makes the UTWS17 the most practical battery implementation the series has offered to date.

 

Features & Connectivity:

Wireless Codecs and Bluetooth:

The QCC5181 chipset gives the UTWS17 the broadest codec support of any FiiO wireless adapter to date. aptX Lossless at up to 1.2Mbps is the headline addition, delivering CD-quality audio at 44.1kHz/16-bit without lossy compression on compatible sources, which currently means smartphones and computers equipped with a Qualcomm Snapdragon 800 series processor or equivalent Snapdragon Sound certified hardware. LDAC at 990Kbps remains available for Sony and Android devices that do not support aptX Lossless, while LHDC V5 supports up to 192kHz/24bit on compatible Huawei and Android 13 devices. aptX Adaptive covers the 96kHz/24bit use case on Qualcomm-paired sources, and aptX Classic is available as a fallback for older devices without the higher-resolution codec support.

Bluetooth 6.0 contributes improved connection stability and reduced interference compared to the Bluetooth 5.2 of the UTWS5 and the 5.1 of the UTWS3, and in practice the UTWS17 maintained a stable connection throughout the testing period without a single dropout during normal use in a mixed-device indoor environment. Multipoint connection allows two source devices to be paired simultaneously, switching between them without manual re-pairing, which is a useful feature for anyone switching between a phone and a laptop as primary source devices during the day.

 

FiiO Control App:

The FiiO Control app, available for both Android and iOS, provides the primary interface for the UTWS17’s configurable features. On connection, the app’s main screen shows a live codec readout identifying which protocol is currently active alongside individual battery percentages for the left and right hooks, which is exactly the kind of operational transparency a wireless audio device benefits from showing upfront rather than burying in a status menu.

The 10-band parametric EQ is the most practically useful feature in the app for listeners with a preferred tonal correction or a preference for a particular target curve. Each band is independently adjustable and the settings persist in the hooks’ non-volatile memory after a session ends, meaning a configured EQ is applied on the next use without needing to reconnect to the app first. Button customization lets each press pattern on the physical button be remapped across play and pause, skip, volume, codec selection, game mode, and ambient mode, and the range of assignable functions is comprehensive enough to suit most daily use patterns without compromise.

 

Gaming & Voice:

Activating game mode from the app or with a button press switches the connection to aptX Adaptive’s low-latency configuration, bringing end-to-end latency down to approximately 74.6ms on a compatible source. That figure is well below the 100ms threshold above which most listeners begin perceiving a noticeable lip-sync offset in video content, and in practice game mode kept audio and visual events synchronized satisfactorily across gaming and streaming content tested during this review.

Call performance uses aptX Voice’s 32kHz ultra-wideband audio for the uplink, processed through a dual-microphone array on the hooks with FiiO’s latest CVC noise cancellation algorithm. Voices came through with good clarity on both ends of calls conducted in moderately noisy indoor environments, and the dual-microphone array effectively reduced the ambient noise contribution without introducing the harsh attenuation artifacts that some single-microphone noise cancellation approaches produce.

 

Technical Specifications:

• Chipset: Qualcomm QCC5181
• Bluetooth Version: 6.0
• DAC: Dual Independent AK4333 (One Per Channel)
• Output Power: 85mW + 85mW (@ 32Ω)
• Codecs: aptX Lossless (1.2Mbps), LDAC (990Kbps), LHDC V5 (192kHz/24bit), aptX Adaptive (96kHz/24bit), aptX Classic, aptX Voice (32kHz UWB)
• Snapdragon Sound: Yes
• Charging: Contactless Wireless (Ear Hooks), USB-C (Case)
• Case Display: Battery Indicator + Pairing Status
• Connectors: MMCX + 0.78mm 2-Pin (Both Sets Included)
• PEQ: 10-Band High-Precision
• Volume Control: 32-Step Independent
• Latency (Game Mode): 74.6ms
• Microphone: Dual-Mic Array, CVC Noise Cancellation
• Multipoint Connection: Yes (2 Devices)
• App: FiiO Control (Android + iOS)

 

Equipment Used for This Review:

• Bluetooth Adapter      : FiiO UTWS17, FiiO UTWS5, iFi Go Pod
• IEM’s                          : Noble Audio Knight, FiiO FP3, Campfire Audio Supermoon

 

Albums & tracks used for this review:

• Gogo Penguin – Raven
• Lorde – Royal Massive Attack – Angel
• Toutant – Rebirth
• Really Slow Motion – Deadwood
• Massive Attack – Angel
• Muse – The Handler
• Twerl – Lishu
• U2 – Sunday Bloody Sunday
• Lunatic Soul – The Passage
• Metallica – Sad but True
• Megadeth – Sweating Bullets
• Rush’s – Leave That Thing Alone
• Slayer – Angel of Death
• Liquid Tension Experiment 2 – Acid Rain
• Edith Piaf – Non Je Ne Regrette Rien
• Diana Krall – So Wonderful
• Aretha Franklin – I Say a Little Prayer
• Hayley Westenra – Odyssey Album
• Dionne Warwick – Walk On By
• Sarah McLachlan – Angel
• Sting – Englishman in New York
• Barry White – Just The Way You Are
• Isaac Hayes – Walk On
• Elton John – Rocket Man
• Eric Clapton – Wonderful Tonight
• Sting – Englishman in New York
• Casey Abrams – Robot Lovers
• Fazıl Say – Nazım Oratoryosu (Live)
• Chopin – Nocturn No. 20 In C-Sharp Minor
• Vivaldi – Le QuarttroStagioni “The Four Seasons”
• Otto Liebert & Luna Negra – The River

 

 

The Sound:

Any honest evaluation of a Bluetooth ear hook adapter has to start from the acknowledgment that the codec in use is the ceiling above which the audio quality cannot rise, and the source device determines which codec is available. All critical listening for this review used a Snapdragon 8-series Android device paired over aptX Lossless, the UTWS17’s highest-fidelity connection mode, which delivers a lossless 44.1kHz/16-bit data stream at 1.2Mbps. Within that ceiling, the UTWS17’s dual AK4333 DAC and amplifier circuit then does the work of converting and amplifying that digital signal, and it is in that second stage where the UTWS17’s own sonic character sits.

The AK4333 is a mobile-tier AKM DAC chip known for a smooth, musical character that avoids the clinical brightness some ESS-based portable implementations introduce, while retaining good detail retrieval and a clean noise floor. The dual-mono configuration, with each channel processed by its own dedicated chip rather than sharing a single chip between left and right, keeps channel separation high and prevents the left and right signal paths from sharing a noise floor. The practical result across all three IEMs tested is a presentation that is notably clean and quiet in the background, with a tonality that leans gently toward warmth and musicality rather than strict measurement neutrality.

 

Noble Audio Knight:

The Noble Audio Knight, a multi-driver tribrid IEM with its own warm, detailed character, paired well with the UTWS17’s smooth AKM-based tonality. The combination produced a presentation with genuine warmth and a richly textured midrange that suited vocal-heavy and acoustic material particularly well, with male vocals carrying natural body and female vocals staying present without the upper-midrange edge that can appear when a brighter source pairs with an already-forward IEM.

Bass through this pairing was full and controlled rather than lean or clinical, carrying the Knight’s natural low-end weight without the UTWS17 adding excessive emphasis on top of it. Sub-bass extension was present and audible rather than being filtered by the codec or attenuated by the amplifier stage, and mid-bass remained disciplined rather than blooming across the lower midrange. Treble was the smoothest of the three IEM pairings tested, with the Knight’s already-restrained upper registers combining with the AK4333’s own smooth top end to produce a presentation that was easy to listen to over extended sessions without any sense of fatigue.

Soundstage and imaging through the aptX Lossless connection held up well relative to what the Knight delivers on a wired source, with the lateral imaging precision remaining clear and center image stability staying solid throughout. The gap versus a high-quality wired source was narrower than expected for a wireless connection, which reflects both the lossless codec’s ability to preserve timing information and the dual-AK4333 circuit’s clean channel separation.

 

FiiO FP3:

The FiiO FP3, FiiO’s planar IEM with its 10mm planar magnetic driver, provided the analytically sharpest pairing of the three IEMs in this review. Its naturally detailed, extended treble and fast planar transient character gave the UTWS17’s AK4333 circuit a more demanding load than either of the other two IEMs, and the result was a presentation that highlighted the UTWS17’s noise floor performance and channel separation more clearly than either warmer or smoother IEM could.

Bass through the FP3 pairing was tight and linear, consistent with the planar driver’s natural character, with no audible coloration from the UTWS17’s amplifier stage adding warmth or weight that is not in the recording. The clean, linear bass suited electronic and analytically recorded acoustic material well, and the FP3’s fast decay kept individual bass notes separable even on complex passages. Midrange was the most detailed of the three pairings, with the FP3’s strong instrument separation and natural timbre coming through clearly rather than being softened by the adapter’s amplification, which is a credit to the dual-AK4333 configuration’s transparency.

Treble through this pairing showed the most air and extension of the three IEMs tested, with cymbal decay and string harmonics resolving cleanly and with a sense of genuine reach rather than a smoothed-over approximation. The UTWS17’s 85mW per channel output was sufficient to drive the FP3 with full dynamic authority across normal listening levels, with no audible compression or current limitation during louder passages on either source tested.

 

Campfire Audio Supermoon:

The Campfire Audio Supermoon, an all-planar IEM with its custom PureFlow driver system and a notably open, transparent tuning, produced the most spatially impressive pairing of the three IEMs in this review. The Supermoon’s characteristic openness and wide staging transferred convincingly through the UTWS17’s aptX Lossless connection, with the left-right instrument placement reading clearly and the depth layering holding up in a way that confirms the codec and the dual-DAC circuit are preserving spatial information rather than collapsing it.

Bass through the Supermoon pairing was controlled and extended, with the UTWS17 providing a clean amplification stage that let the Supermoon’s own bass character come through rather than imposing the adapter’s own coloration. Female vocals, a particular strength of the Supermoon, were rendered with a clear, airy presence that the AK4333’s smooth tonality complemented rather than softened excessively, keeping the upper midrange region open and present rather than retreating behind the warmth the AK4333 can introduce on IEMs that are already warm by tuning.

This pairing also provided the clearest comparison point for the aptX Lossless codec’s contribution. Switching from aptX Lossless to LDAC on the same source and IEM combination produced an audible if modest narrowing of the stage and a slight thickening of the treble texture, confirming that the lossless codec is doing real work preserving the Supermoon’s most technically demanding qualities rather than being a theoretical specification difference with no audible consequence.

 

Comparisons:

FiiO UTWS17 vs. FiiO UTWS5:

The UTWS5 established the baseline that most existing FiiO wireless hook users will be upgrading from, and the comparison between the two devices is the most practically useful one for anyone in that position. The UTWS5 uses a Qualcomm QCC3040 processor with Bluetooth 5.2, supports LDAC and aptX but not aptX Lossless, draws its amplification from a single-DAC design rather than a dual-mono configuration, and charges its hooks through physical pin contacts on the case rather than contactlessly. At $119, it sits $100 below the UTWS17, which makes the feature gap between the two directly relevant to whether the upgrade is worth pursuing.

In the bass, the UTWS17’s dual AK4333 circuit produces a more composed, cleaner low end than the UTWS5’s single-DAC design, with better channel separation and a slightly tighter transient character that is most audible on bass-heavy electronic material where the two channels interact at low frequencies. The UTWS5 is not a poor performer in the bass, but the UTWS17’s cleaner channel isolation keeps individual bass notes from accumulating the slight mutual interference that can appear in a shared-DAC design under complex signal conditions.

The midrange is where the codec difference between the two devices is most directly audible. The UTWS5’s LDAC connection at 990Kbps is a high-quality lossy transmission rather than a lossless one, and on midrange-forward IEMs with fine vocal detail, the difference between the UTWS17’s aptX Lossless and the UTWS5’s LDAC shows up as a small but consistently audible increase in vocal texture and fine detail resolution. The UTWS17’s midrange also benefits from the dual-AK4333’s lower noise floor, keeping background detail in quieter passages from being raised above the channel noise.

Treble is similarly affected by the codec difference, with the UTWS17’s lossless connection preserving more of the fine transient detail in cymbal decay and upper harmonic content that LDAC’s compression algorithm occasionally smooths at the bit-rate ceiling. The UTWS5 is already a capable treble performer for a Bluetooth adapter, but the UTWS17 extends that capability further by removing the codec as a limiting factor entirely for compatible sources.

Practically, the three quality-of-life improvements the UTWS17 delivers beyond the audio performance upgrades are worth factoring into the comparison equally with the sonic ones. Wireless charging on the hooks eliminates the pin oxidation and contact debris issue that was the most frequently reported long-term reliability complaint about the UTWS5 and UTWS3. The included connector sets in both MMCX and 0.78mm 2-pin remove the single-standard limitation of the UTWS5’s package. And the case display replaces the LED-only battery indication system of the UTWS5 with a properly readable readout. For existing UTWS5 owners with a Snapdragon Sound compatible smartphone, the UTWS17 is a meaningful step forward in both audio quality and usability; for owners of a source device that does not support aptX Lossless, the gap narrows considerably and the $100 price difference deserves more careful consideration.

 

FiiO UTWS17 vs. iFi Audio GO Pod:

The iFi Audio GO Pod approaches the same device category from a different technical direction: rather than building around a Qualcomm processor and aptX codec ecosystem the way FiiO has done throughout the UTWS series, iFi uses a Cambridge Silicon Radio chip with LDAC and aptX HD support, a dual ESS ES9219C DAC configuration, and iFi’s own XSpace and XBass II signal processing modes that can be toggled from the device. The GO Pod is priced at approximately the same level as the UTWS17, making the comparison a direct one between two distinct philosophical approaches to wireless HiFi.

In the bass, the ESS ES9219C and the AK4333 differ in a way that is directly audible in this comparison. The GO Pod’s ESS-based circuit produces a leaner, faster, more analytically controlled low end, while the UTWS17’s AK4333 circuit adds a small but noticeable amount of warmth and density to the bass region. Listeners who want maximum bass precision and the tightest possible transient presentation will prefer the GO Pod’s bottom end; listeners who want more physical presence and warmth in the low frequencies will find the UTWS17 the more satisfying pairing, particularly with IEMs that already trend toward a lean or balanced bass character.

The midrange comparison is less one-sided. The GO Pod’s ESS circuit produces a slightly colder, more neutral midrange without the AK4333’s warmth, which reads as more analytically transparent on well-recorded material but less forgiving on brighter or more compressed recordings. The UTWS17’s AK4333 midrange adds a layer of smoothness and body to vocals that some listeners will find more natural and engaging, while others will consider it a small coloration sitting between them and the source material. The GO Pod’s XSpace processing mode can add a degree of artificial soundstage widening that the UTWS17 does not attempt, though whether that processing is welcome depends entirely on the listener’s preference for accurate versus spatially enhanced presentation.

Treble is the comparison’s most significant technical differentiator. The UTWS17’s aptX Lossless codec support gives it a fundamental advantage on compatible sources that the GO Pod’s LDAC ceiling cannot match, and that advantage shows up as better preserved fine treble detail and more accurate upper-register texture. On a non-aptX Lossless source where both devices are limited to LDAC, the gap closes considerably and the GO Pod’s ESS circuit competes more directly with the UTWS17’s AK4333 on outright treble resolution.

The usability comparison favors the UTWS17 on several practical points. The GO Pod does not include both connector types in the box, requiring a separate purchase for whichever connector standard an IEM uses that the included one does not cover. The UTWS17’s wireless hook charging eliminates the contact-degradation concern that physical pin charging on the GO Pod retains. And the UTWS17’s FiiO Control app integration offers more comprehensive control over EQ, codec selection, and button customization than the GO Pod’s button-limited on-device interface. The GO Pod has the advantage of XBass II and XSpace processing for listeners who specifically want those modes, and its ESS-based character suits listeners who specifically prefer the ESS house sound over AKM’s warmer presentation.

 

Conclusion:

The FiiO UTWS17 is the most complete wireless IEM adapter FiiO has produced, and it arrives having addressed the three most significant user requests that accumulated across the UTWS series: aptX Lossless codec support for lossless wireless transmission, contactless charging on the ear hooks themselves rather than through oxidation-prone physical pins, and both connector types included in the box rather than requiring a separate purchase to cover the full IEM market. These are not incremental improvements to a product that was already close to finished; they are the resolutions to specific, recurring practical limitations of the category.

The dual AK4333 DAC configuration delivers the cleanest, most channel-separated amplification the UTWS line has yet offered, and the sound quality on a compatible aptX Lossless source is close enough to a wired reference to make the wireless compromise notably difficult to hear rather than merely tolerable. For a listener whose IEM collection spans both MMCX and 0.78mm 2-pin standards, and who has a Snapdragon Sound compatible source device, the UTWS17 is the most capable solution currently available in the wireless ear hook adapter category.

 

Pros & Cons:

• + Rich Sonic Tuning that offers a smooth, musical sound with warm, natural vocals, deep controlled bass, and an fatigue free, extended treble response.
• + aptX Lossless at 1.2Mbps provides genuine CD quality sound, outperforming LDAC on
• + Dual AK4333 DACs deliver exceptional channel separation, a lower noise floor, precise imaging, and improved spatial depth.
• + Keeps fast bass decay crisp and preserves subtle vocal textures and upper harmonic decay in complex acoustic tracks
• + Eliminates physical metal pins on the ear hooks to completely prevent oxidation and debris wear over time.
• + Includes both MMCX and 0.78mm 2 pin connectors, Bluetooth 6.0, multipoint, 10 band PEQ, and an informative case screen.

 

• – Smooth AKM tuning adds a touch of warmth that may not suit listeners looking for an ultra neutral or bright sound.
• – 85mW output per channel is adequate for sensitive IEMs but may not fully satisfy the potential of harder-to-drive balanced armature arrays at reference listening levels
• – aptX Lossless requires Snapdragon Sound certified sources; falling back to LDAC reduces the performance leap over earlier models

 

Thank you for the Read!