Compare Marshall Kilburn III Portable Bluetooth Speaker vs JBL Grip Bluetooth Speaker

Power references point to a strong 50W Class D amplifier setup, repeatedly tied to the speaker's loud, forceful output.

App impressions are mixed: one reviewer could not finalize the app connection, while others found the app clean, useful, and easy for EQ and settings.

The JBL Portable app is generally treated as useful and easy to use for EQ, lighting, firmware, and battery monitoring, though one reviewer notes the app must be updated to recognize the Grip.

Audio format support is adequate but limited, with reviewers noting SBC, AAC, and LC3 while calling out the lack of higher-resolution codecs.

Auracast gives the Grip modern JBL pairing options, but reviewers repeatedly note it will not pair with older PartyBoost JBL speakers.

Battery life is one of the clearest strengths, with reviewers repeatedly citing about 50 hours or real-world multi-day use.

Battery life is usually presented as acceptable for a tiny portable speaker, but real-world estimates vary widely from around 6 hours at high volume to roughly 10.5-14 hours in lighter use.

Bluetooth codec support covers standard lossy codecs, but reviewers consistently noted the absence of hi-res options such as LDAC or aptX Adaptive.

Codec support is basic but adequate, with reviewers confirming SBC and AAC or at least SBC support.

Bluetooth connection stability tested well in direct use, with one reviewer reporting easy pairing, a solid connection, and no signal weirdness.

Direct connection evidence is positive, with one reviewer reporting stable Bluetooth use and no dropouts.

Bluetooth range is viewed positively, with reviewers citing a 10-meter range and one test exceeding that distance around the house.

Build and cabinet quality are praised as solid, premium, and durable-feeling, with sturdy materials and a serviceable battery access door.

Reviewers describe the physical build as durable, using tough grille materials or a front-firing driver with passive radiators rather than any advanced bracing discussion.

Charging is generally strong with USB-C PD and quick-charge claims, though reviewers warn that weaker chargers or playback while charging can slow things down.

The few reviews that mention charge duration report about three hours for a full charge.

The speaker presents a cohesive Marshall package, combining warm sound, loud output, physical controls, and retro styling into a unified experience.

The Grip is credited with a coherent, balanced presentation for its size, even when reviewers note limits in bass or staging.

Physical control feel is a major strength, with reviewers praising tactile switches, knobs, and playback controls.

Raised playback buttons and physical controls are described as easy to find and functional, with hands-on testing confirming the controls work.

Design is one of the most widely praised traits, with reviewers repeatedly calling out the amp-inspired retro look, premium finishes, and statement-piece character.

Most reviewers like the can-like upright design, compact shape, colors, and light strip, though one reviewer is less convinced by the upright-only form.

Detail retrieval is generally strong, especially in vocals, cymbals, bass texture, and layered tracks, though one reviewer heard some upper-mid detail loss.

Detail is better than expected for the size in several reviews, but PCMag and Gizmodo note limited midrange complexity or percussion detail.

High-volume distortion control is excellent across reviews, with repeated reports of loud playback without cracking, hissing, peaking, muddiness, or obvious distortion.

High-volume behavior is mixed: several reviewers report clean playback, while others heard clipping, vocal echo, fatigue, or compressed bass in demanding cases.

Durability is a clear strength, with reviewers citing drop-proof or shockproof construction and one video showing it surviving a drop test.

Dust resistance improved over the prior model, with reviewers consistently citing IP54 protection as useful but not fully rugged.

The Grip is consistently identified as IP68 or dust-resistant/dustproof across reviews.

Dynamic behavior is a strength, with reviewers crediting dynamic loudness and placement compensation for preserving balance and detail as volume changes.

Reviewers find the 16W output surprisingly potent for the size, enough for personal spaces, picnic tables, or small gatherings rather than full parties.

Energy efficiency is supported by the unusually long runtime from only a modest battery-capacity increase, which one reviewer attributes to major efficiency gains.

Playtime Boost is framed as an efficiency mode that can extend runtime, but it trades off some low-end sound quality.

EQ customization is broad for a Bluetooth speaker, with physical bass and treble knobs plus app presets, custom EQ, placement compensation, and M-button shortcuts.

EQ customization is a consistent strength, with reviewers citing presets plus a seven-band or custom EQ in the JBL Portable app.

Everyday usability is strong thanks to straightforward controls, easy living-room use, and the ability to move the speaker around without losing useful sound coverage.

Everyday usability is strong because the Grip is easy to carry, bag, place on a desk, or fit into cup holders and backpack pockets.

Multiple reviewers confirm the Grip is waterproof but does not float, with one water test showing it sinking.

Frequency balance is broadly praised for tight bass, clear mids, and crisp highs, though a few reviewers heard extra bass or mids in some contexts.

The Grip usually sounds good or balanced for its size, but reviewers flag limited deep bass, some high-frequency emphasis, or reduced bass in Playtime Boost.

Google support is limited to Fast Pair, which reviewers describe as a useful setup convenience rather than a full smart ecosystem feature.

The carry strap is praised for comfort, style, and usefulness, especially its velvet lining and secure feel despite the speaker's weight.

The loop is useful for clipping or hanging, but strap quality is a recurring caveat because several reviewers find it small, short, or less versatile than JBL alternatives.

Home theater integration is limited today, but one reviewer notes future Auracast surround use with Marshall soundbars as a possible path.

Inter-speaker connectivity is a weakness: reviewers repeatedly note no native stereo pairing or multi-speaker system, and one Auracast attempt was glitchy.

Auracast and JBL speaker linking are major strengths, enabling synchronized playback with newer compatible JBL speakers and multi-speaker setups.

Latency evidence is limited but positive for video watching on a phone, with one reviewer saying latency was not an issue.

LED lighting is present as functional knob illumination and level indication, not as decorative party lighting.

The rear LED strip is widely noted as fun and customizable, with colors, modes, and brightness controls available through the app or speaker.

Lighting is limited to useful LED indicators on the controls rather than immersive or decorative effects.

Lighting feedback is mixed-positive: reviewers like the added ambiance, but some complain it is subtle, not beat-synced, or not useful enough.

Maximum volume is a major strength, with reviewers describing serious, room-filling, or even unbelievable loudness for a single portable speaker.

The Grip gets surprisingly loud for its size and can handle casual outdoor or small-room use, but it remains below the Flip 7 or larger speakers.

Low-volume performance is specifically praised for retaining richness, separation, and bass rather than thinning out in background listening.

Limited evidence suggests low and moderate volume playback is clean and detailed, with issues emerging more at higher levels or with Playtime Boost.

The microphone category is a clear weakness because multiple reviewers state there is no built-in mic.

The Grip lacks a built-in microphone, so reviewers say it cannot handle phone calls or speakerphone use.

Multi-speaker pairing reliability is weak because reviewers say the speaker lacks true wireless stereo or native multi-speaker pairing, with one failed Auracast attempt.

Hands-on evidence for multi-speaker pairing is positive where tested, including Auracast working well and a demo where speakers connected together.

Multipoint connectivity is supported and described as letting two devices pair at the same time.

Multipoint is a documented strength in reviews that say the Grip supports two devices at once.

Omnidirectional sound is a standout feature, with reviewers repeatedly praising the 360-degree, wide, room-filling presentation and minimal dead spots.

The Grip is not truly omnidirectional; reviewers describe one-directional sound or a single driver whose orientation affects clarity.

On-device controls are a major strength, with reviewers repeatedly praising the knobs, switches, playback control, and simple no-learning-curve operation.

On-device controls are clearly present and useful, including top buttons for power/Bluetooth/Auracast and front playback and volume controls.

The power-bank function is repeatedly confirmed, letting the speaker charge phones or other devices through USB-C.

The USB-C port is only for charging the speaker, with one reviewer explicitly saying it cannot charge other devices.

Price and value are mixed-to-positive: reviewers call it pricey, but most say the sound, design, battery, and upgrades justify the cost.

Value is the biggest split: some call the $100 price persuasive, while others prefer the Flip 7, Clip 5, Motion 300, or cheaper competitors.

Setup is simple, helped by Bluetooth pairing and Google Fast Pair, with one reviewer calling the pairing process real simple.

Setup is described as easy, especially Bluetooth pairing and basic controls.

Smart assistant integration is effectively absent, with reviewers repeatedly noting no voice assistant or voice control.

Smart assistant integration is effectively absent because the speaker lacks the microphone needed to summon an assistant.

Smart features are intentionally minimal, with no Wi-Fi, voice assistant, or smart-speaker behavior despite a useful app and EQ tools.

The Grip's smart-feeling extras are app-based rather than voice-based, centered on EQ, lighting, firmware, battery monitoring, and Auracast management.

Speakerphone capability is absent because reviewers state there is no built-in microphone and that it cannot be used as a speakerphone.

Speakerphone capability is absent because reviewers say it cannot double as a speakerphone or be used for voice calls.

Status indicators are useful, with reviewers highlighting the 10-bar battery gauge and illuminated control-level LEDs.

Status indication is present through LED/battery/pairing indicators, but one reviewer wanted the light strip to work better as a battery indicator and another noted no backlit buttons.

Stereo imaging is wide and impressive, but not truly precise stereo separation; reviewers praise spaciousness while noting symmetry and separation limits.

The Grip is mono by itself, but true stereo is possible only with a second matching Grip; reviewers consider this useful but conditional.

Low-end hardware gets positive attention, with reviewers citing the built-in subwoofer or woofer as a source of strong bass.

Surround-like presentation is wide and immersive, but reviewers caution that it is not true full surround sound.

Surround-style use is only possible through multiple linked speakers, and reviewers frame it as a multi-speaker effect rather than native surround.

Sustainability is supported by the replaceable battery design and battery-preservation features that may extend useful life.

Sustainability evidence is limited but positive, with one reviewer noting recycled plastic and textile in the exterior.

USB-C charging is a clear upgrade and strength, supporting charging the speaker and external devices with modern USB-C hardware.

USB-C charging is consistently present, though several reviewers note the cable or brick is not included and one warns the exposed port must dry before charging.

Overall value for money is mostly positive, with reviewers seeing worthwhile upgrades, strong sound, premium design, and long battery life despite the price.

Overall value is mixed: fans like the size, lighting, and JBL ecosystem, while critics think rivals or the Flip 7 offer better sound or practicality.

Voice clarity is strong for music playback, with reviewers repeatedly reporting clear, forward, or crisp vocals.

Music vocal clarity is generally decent to good, with reviewers describing clear, crisp, or rich vocals despite limits in detail and balance.

Water resistance is useful but moderate: reviewers consistently cite IP54 splash protection while warning it is not full waterproofing or beach-rugged IP67.

Water resistance is one of the strongest attributes, with repeated IP68 claims, submersion language, and water-test survival.

Weight convenience is mixed: reviewers find it carryable with the strap, but repeatedly describe it as heavy, large, or better for home and gatherings than backpacking.

Weight convenience is consistently strong, with the 385g/0.8 lb body praised as light and easy to carry.

Wi-Fi streaming is a weakness because reviewers repeatedly note there is no Wi-Fi support, even at this price.

Wired input is a useful fallback, with reviewers highlighting the 3.5mm AUX port for non-Bluetooth or higher-quality listening paths.

Wired input is absent: reviewers say there is no 3.5mm aux and no wired digital/analog connection through USB-C.