Compare Ultimate Ears Wonderboom 4 Speaker vs Marshall Willen II

Reviewers cite the 10W full-range driver and, in some sources, a 38W amplifier as impressive for the speaker's very small body.

App-related feedback is negative because multiple reviewers state the Wonderboom 4 lacks UE Boom/Boom app support.

The Marshall app is described as solid, though reviewers focus more on its limited feature depth than reliability problems.

Audio format support is basic, aligning with the limited Bluetooth codec evidence rather than hi-res or advanced format playback.

Audio format support is limited because reviewers note the lack of high-resolution audio support, though they do not frame it as a major issue for this size.

Backward or generation compatibility is mixed: some reviewers cite Wonderboom 3/4 pairing, while Tom’s Guide says stereo playback only works with another Wonderboom 4.

Backwards compatibility is mixed: the lack of wired audio hurts older-device use, and one reviewer notes the older Willen had stack features this version lacks.

Battery life is consistently solid around the advertised 14 hours, with one reviewer reporting about 12 to 13 hours at moderate volume and others calling it long-lasting.

Battery life is one of the clearest strengths, with reviewers repeatedly reporting about 14 to 17-plus hours depending on volume and use.

Codec support is basic, with SoundGuys calling it SBC-only and TechRadar noting no hi-res codec support.

Bluetooth stability is mixed: most reviewers found stable or drop-free connections, but Forbes reported Samsung Galaxy S25 Ultra audio cutouts.

Bluetooth stability is consistently praised, with reviewers noting stable connections, strong range, and music that does not cut out nearby.

Bluetooth range is consistently described as long for a small speaker, with claims or tests around 40 meters or 131 feet.

Range is a stated strength in the reviews that measured or cited it, ranging from 100 meters to an unusually long 240 meters.

Build quality is a major strength: reviewers repeatedly describe a robust, dense, rugged speaker with premium-feeling materials.

Charging time is acceptable but not standout, with quotes around 2.5 to 2.6 hours and one review noting no fast charging.

Charging is strong for travel use, especially the repeated claim that about 20 minutes of charging gives roughly five to five and a half hours of playback.

Cohesion is strong at normal volumes, with reviewers describing balanced sound, good separation, a clean presentation and a nicely balanced soundstage.

The Willen II is consistently described as balanced, clean, warm, and coherent rather than bass-heavy or party-focused.

Physical controls are generally considered simple and easy to press, though TechRadar notes a small learning curve due to unmarked top buttons.

Reviewers like the Marshall joystick control because it feels intuitive, solid, and easier than common multi-press button layouts.

Design feedback is consistently positive for the colorful, rugged, compact look, with reviewers calling it slick, cute, modern or well designed.

Design is one of the broadest points of agreement: reviewers praise the retro Marshall amp look, rock styling, and premium finish.

Detail retrieval is strong for the size, with reviewers hearing separation, production details, defined instruments and clarity across tracks.

Detail retrieval is repeatedly praised for the size, with clear highs, audible detail, and better instrument texture than expected from a tiny speaker.

Dialogue clarity is supported through the Voice preset, which reviewers describe as useful for podcast and audiobook dialogue.

High-volume behavior is the main sound weakness: several reviews heard harshness, strain or a quality drop near the top, while two YouTube reviews reported little distortion.

High-volume behavior is mixed: several reviewers praise clarity and low distortion, while others mention vibration, tinny sound, or limited output.

Durability scores highly because reviewers repeatedly mention drop-proofing, rugged construction and resistance to knocks, water and outdoor abuse.

Only one review directly supports drop durability, saying both tested speakers survived drops without damage.

Dust protection is also strong, with IP67 or dustproof language appearing across many reviews.

Dust resistance is consistently supported through the Willen II's IP67 dust and water resistance rating.

Dynamic headroom is mixed: some reviewers heard clear deterioration when pushed, while others found it stayed clean or controlled near high volume.

Dynamic headroom is respectable but not unlimited; reviewers praise preserved clarity at higher volumes while also noting output limits.

Energy efficiency is supported by Bluetooth 5.3 comments and its connection to longer battery life and improved connection strength.

EQ flexibility is limited and divisive: there is no app-based custom EQ, while Outdoor Boost and Podcast Mode get mixed reactions.

EQ customization is limited: reviewers repeatedly note three presets and the lack of a full custom EQ.

Everyday usability is strong thanks to simple operation, durable portability and suitability for travel, desktops, showers, parks and small gatherings.

Everyday usability is strong for portable, desk, travel, backpack, and outdoor scenarios, though not always for larger group playback.

Float capability is repeatedly confirmed and useful for pool or beach use, though one reviewer notes it can tip over in water.

Most reviews describe the tonal balance as strong for a compact speaker, with punchy bass, clear mids/highs and generally well-rounded 360-degree sound.

Frequency response balance is one of the Willen II's strongest sonic traits, with reviewers describing flat, accurate, balanced tuning.

Android Police specifically praised Google Fast Pair for making initial connection nearly instant on a Pixel phone.

The loop is useful for clipping or hanging in several reviews, but Tom’s Guide criticized the strap as not very useful.

The rear strap is usually praised as handy and discreet, though one review finds it flimsier than the rest of the build.

Inter-speaker connectivity is useful for stereo or doubled sound, though compatibility details vary by reviewer and mode.

Inter-speaker connectivity is future-looking rather than fully proven; reviews mention Auracast but also note it was not active or dependable yet.

Latency is only lightly supported, but one review credits Bluetooth 5.3 with keeping latency to a minimum.

Reviewers generally found the Wonderboom 4 loud for its size, able to fill small to medium spaces, though one comparison-focused reviewer said it is not meant for genuinely loud large groups.

Maximum loudness splits reviewers: some call it enough for small groups or hit high dB readings, while others find it quiet for the price.

Low-volume use is a niche strength, with SoundGuys finding it acceptable at quiet home levels and T3 praising how quiet it can get.

Microphone support is absent; multiple reviews say there is no built-in microphone or no microphone for calls.

The built-in microphone is a useful extra for calls, mentioned positively as a feature absent from some rivals.

Multi-speaker pairing is useful but limited: reviewers liked two-speaker stereo, while also noting party-style linking or broader Ultimate Ears compatibility limits.

Multi-speaker pairing reliability is weakly supported and negative, with one reviewer warning not to rely on the promised features.

Multipoint support is a practical strength, with multiple reviews noting simultaneous or easy two-device connections.

Multipoint support is explicitly mentioned in one overview: it can pair with up to eight devices and be used with two at a time.

Omnidirectional sound is a major strength, with reviewers consistently describing 360-degree sound that works well around groups.

Omnidirectional sound is not a strength; one review notes listening changes when moving around or positioning the speaker differently.

On-device controls are a strength because the large volume buttons and top controls are simple, visible and easy to use.

On-device controls are a highlight, especially the joystick for volume, playback, and track changes, plus clear top buttons.

The Willen II lacks a power-bank function, which reviewers mention as a missing feature compared with some rivals.

Value is positive overall at around the budget-premium line, but several reviewers note the discounted Wonderboom 3 or cheaper rivals can reduce the Wonderboom 4’s appeal.

Price reactions are mixed: some reviewers call it worth the premium, while others think it is expensive versus louder or cheaper competitors.

Remote control usability is weak because Tom’s Guide says the speaker cannot be turned on or off remotely.

Setup is a clear strength, with reviewers describing pairing as easy, simple, fast or nearly immediate.

Setup appears simple, with pairing described as quick, painless, and trouble-free in the review that directly addresses it.

Smart features are limited; Tom’s Guide notes expected features are missing due to the lack of app support and extras.

Smart-feature depth is modest: the speaker offers app presets, battery options, mic support, and promised Auracast, but not much more.

Speakerphone capability is absent because reviews note there is no microphone and it cannot function as a speakerphone.

Speakerphone support is functional rather than deeply tested, with reviews noting button call controls and phone-call use.

Status feedback is modest but useful, with reviewers citing battery level checks or indicator lights for low battery and pairing.

Status indicators are clear and useful, especially the LED battery indicators that show remaining charge directly on the speaker.

Stereo performance is a clear plus when a second compatible Wonderboom is paired, with reviewers describing true stereo, left-right channels or louder two-speaker playback.

Stereo imaging is limited by the tiny single-speaker form factor, with one review saying instrument separation is not spectacular.

Sustainability evidence is limited but positive, with reviews citing recycled plastic, recycled polyester or over 30% recycled content.

USB-C charging is one of the most welcomed upgrades, repeatedly cited as a practical improvement over microUSB.

USB-C charging is consistently confirmed through the included cable, side port, and explicit charging descriptions.

Value-for-money comments are mostly favorable, especially for sound and durability, but upgrade value is weaker when the Wonderboom 3 is heavily discounted.

Overall value is context-dependent: strong for design, build, battery, and balanced sound, weaker if buyers want maximum loudness per dollar.

Voice reproduction is helped by vocal-forward tuning or Podcast Mode in several reviews, though SoundGuys found vocals harsh once the volume passed a certain point.

Voice and vocal clarity are a repeated strength, with reviewers describing vocals as clear, crystalline, and not muddy.

Water protection is one of the strongest points, with repeated IP67, waterproof, submersion and pool/beach evidence.

Water resistance is well supported across reviews through the IP67 rating and repeated pool, beach, rain, and outdoor-use comments.

Portability is a repeated strength: reviewers cite the light sub-pound or roughly 420g build and easy bag-friendly size.

Weight is still portable, but the Willen II has noticeable heft for its size; reviewers frame that weight as manageable and premium-feeling.

Wired input is absent, with reviewers explicitly saying there is no 3.5mm aux or physical wired option.

Wired input is a clear limitation: reviews repeatedly say USB-C is not for wired audio and there is no AUX input.