Compare Marshall Kilburn III Portable Bluetooth Speaker vs Sony ULT Field 5 Speaker

The Marshall app is generally viewed as useful for EQ, placement compensation, and battery features, but there are reports of occasional pairing/setup friction and some early-stage quirks around broadcast features.

One review found the app mostly well-designed, while another found the setup and update flow frustrating.

Party Connect compatibility extends to older Sony portable speakers, making expansion inside Sony’s ecosystem easier.

Battery life is consistently described as class-leading around 50 hours, with several reviewers noting it lasts days to over a week in normal use and dramatically outclasses many rivals in this size.

Reviews repeatedly cite roughly 25 hours in lighter-use conditions, with shorter runtime implied once output and extras increase.

Codec support is repeatedly called basic, commonly described as SBC/AAC (and LC3 in some coverage), with reviewers noting the absence of higher-end options like LDAC or aptX Adaptive.

Bluetooth support for SBC, AAC, and LDAC is consistently called out across reviews.

Bluetooth stability is largely reported as solid and reliable, with few dropouts mentioned during typical use, though broadcast-style features are not always seamless depending on devices.

The speaker emphasizes stable Bluetooth behavior, with a stability-first mode and positive comments about reliable connection behavior.

Reported range aligns with typical expectations for the class, with at least one review noting it can exceed the stated 10m in real home use.

Range is generally described as good, though one reviewer warns LDAC does not carry as far as AAC/SBC.

Charging is often cited as around three hours with an appropriate USB-C PD charger and includes quick-charge style benefits, but several notes warn slower chargers can dramatically extend charge time.

Quick charging is a real strength, with reviewers repeatedly citing about 100 minutes of playback from a 10-minute charge.

Overall presentation is consistently described as cohesive and engaging, with strong room-filling character and a tuning that works across many genres without falling apart at higher volumes.

One review describes the overall sound as consistent and cohesive even if it is not the most resolving.

Button and control responsiveness is consistently described as satisfying and tactile, with several reviews calling out the premium feel of toggles, knobs, and playback controls.

Controls cover the basics well, but the dedicated ULT button feels better than the softer rubberized keys.

Nearly every review highlights the signature Marshall amp-inspired look, premium materials, and tactile hardware controls as a major reason to buy, often calling it a statement piece for the home.

The design is rugged and clean but visually plain to some reviewers, with finish and lighting doing much of the personality work.

Detail is widely considered strong for a portable speaker, with good separation and clarity across genres, though some commentary suggests top-end nuance and precision can trail the very best competitors in ideal listening positions.

Fine detail is not a strength here, and upper-register elements can get lost in the mix.

Reviews frequently praise how well it controls distortion at higher volumes, with dynamic loudness and tuning keeping the sound from getting harsh or breaking up when pushed.

Reviews generally say it stays controlled at high output, with little obvious distortion even when bass boost is active.

Build is often described as tank-like and sturdy, with reviewers suggesting it should handle everyday knocks and occasional falls better than many plastic-bodied competitors.

One reviewer explicitly says the speaker still looked good after bumps and knocks, reinforcing the rugged-build theme.

Dust resistance is tied to the IP54 rating and is framed as adequate for everyday outdoor use (patios, parks), but not a fully rugged, sand-and-submersion type rating.

Dust resistance is a clear strength, with direct IP67-style outdoor protection references.

Dynamic headroom is repeatedly credited for keeping the sound energetic and controlled as volume changes, helping preserve detail and balance at both moderate and loud listening levels.

It gets loud, but review evidence also points to compression and reduced openness once volume is pushed harder.

One detailed review highlights major efficiency gains enabling very long playtime from only modest battery capacity growth, suggesting strong power management for the class.

One reviewer specifically criticized the party lighting for poor power efficiency.

EQ flexibility is frequently praised: users can tweak bass/treble with physical knobs and use app-based presets plus a multi-band EQ, with shortcuts like an M button for quick switching.

The app provides a 10-band EQ, though reviewers note it cannot fully replace or match the built-in ULT presets.

Review evidence frames the speaker as practical for regular indoor/outdoor use, not just occasional parties.

Most coverage describes a lively, warm-leaning balance with strong bass and clear mids, though a few notes mention it can sound a bit bass-forward or have occasional mid/treble character that some listeners may want to EQ.

The tuning is engaging but not neutral, with bass emphasis often overshadowing mids and highs even though some heard a fairly balanced baseline.

Google Fast Pair support is explicitly mentioned.

The carry strap/handle is frequently praised for comfort and security, making the speaker easier to move around than some similarly heavy rivals.

The included strap is useful and solid, but attachment convenience is mixed depending on the reviewer.

Stereo pairing and large-scale Party Connect support are recurring strengths for bigger setups.

LED effects are bright and customizable, adding obvious party appeal.

The lighting is designed to pulse with the music and reinforce the speaker’s party identity.

The Kilburn III is repeatedly described as very loud for its class and capable of powering outdoor hangs or parties, with enough headroom to feel big in larger rooms.

High output is one of the clearest strengths, with multiple reviewers emphasizing how loud and party-ready it gets.

Low-volume listening is reported to stay rich and satisfying, helped by dynamic loudness behavior that avoids losing bass and body when playing quietly.

At low listening levels, one reviewer still found the sound full and satisfying at close range.

The speaker includes microphones for calls, but the reviews do not go deep on call quality.

A frequent downside is the lack of native stereo pairing or a built-in multi-speaker ecosystem; Auracast is discussed as a workaround, but it depends on compatible sources and is not universally smooth yet.

One reviewer explicitly describes Party Connect as more stable and easier to use than a competing multi-speaker system.

Multipoint capability is referenced as available in some coverage, supporting quick switching or pairing to two devices, though it is not the primary focus of most reviews.

Two-device multipoint pairing is repeatedly called out across reviews.

Multiple reviewers confirm the 360-style presentation works well, maintaining a full sound as you move around the speaker, though a few describe it as not perfectly wraparound like some cylindrical rivals.

One reviewer specifically notes that this is not a 360-degree or omnidirectional speaker.

On-device controls are repeatedly praised as a major strength: tactile knobs, dedicated playback control, and shortcut buttons reduce reliance on the app and are easy for anyone to use.

The on-speaker controls cover the main actions clearly and are easy to access.

Power bank use is a highlighted perk, letting you charge a phone from the speaker, with at least one review noting you should pay attention to charge direction behavior depending on speaker power state.

The USB-C port can charge external devices, and multiple reviews present that as a meaningful convenience feature.

Direct value comments are favorable, describing the speaker as well-priced or affordable for what it offers.

One reviewer specifically praised the lack of smart-speaker creep from a privacy/security angle.

Setup is typically described as straightforward with fast pairing behavior, and most reviewers report stable day-to-day use once connected.

Basic pairing is described as quick and uncomplicated.

One reviewer explicitly says it is not a smart speaker, so assistant integration is essentially absent.

Smart features are intentionally limited: reviews repeatedly note no Wi-Fi streaming and no voice assistant, with the app focused on sound shaping, placement compensation, and battery management.

Lighting control, EQ, DJ tools, and sound field optimization give it a robust feature set for a portable speaker.

Several reviews explicitly note the lack of a built-in microphone, meaning it is not a good choice if you want speakerphone or hands-free calling features.

Status feedback is frequently described as strong, including battery indication and LED/indicator behavior around physical knobs that makes quick adjustments easy without looking at a phone.

The speaker provides direct battery-status feedback, which adds convenience in daily use.

Reviews commonly note it is stereo only in a technical sense; the footprint feels wide, but true left-right separation and pinpoint imaging are limited compared to dedicated stereo pairs.

It offers some stereo capability, but several reviewers say separation and stereo effect remain limited.

No summary yet.

Replaceable battery access and longevity features are repeatedly framed as a sustainability win, helping extend the usable life of the speaker compared to sealed-battery designs.

USB-C charging is broadly praised as convenient and modern, with some reviews noting the lack of an included high-wattage adapter as a small annoyance.

USB-C charging is explicitly mentioned for recharging the speaker.

Value is generally considered good for buyers prioritizing design, battery, and big sound, but some reviewers still flag the price as premium given the lack of Wi-Fi, voice features, and stereo pairing.

Value looks more mixed at varying street prices, with one review calling it overpriced and another calling it not too expensive.

Vocal clarity is serviceable but inconsistent, with some reviewers hearing good cut-through and others hearing roughness or masked mids.

IP54 protection is generally seen as a welcome upgrade that handles splashes and light rain, but many reviewers still call it less rugged than IP67-style competitors for serious outdoor abuse.

Water resistance is a core strength, with repeated IP67 or IP66/IP67-style mentions for outdoor use.

Multiple reviews call it heavy for true travel or backpack use, though the strap helps and most position it as portable around home, yard, or short trips rather than hiking gear.

Multiple reviews flag the weight as noticeable, bulky, or less bag-friendly than smaller portable speakers.

Reviews commonly note the presence of a 3.5mm AUX input as a useful fallback for wired listening and for sources that can benefit from a cable connection. Wired AUX use is generally described as a good alternative path for quality listening, with at least one review noting the signal still goes through internal processing rather than staying purely analog end-to-end.

A 3.5 mm analog/AUX input is repeatedly cited as a useful advantage.