Short answer: the JBL Xtreme 5. It ranks #2 of 97 large speakers by sound quality, rated 4.6/5, at $399.95. The Marshall Kilburn III ranks #41, rated 3.8/5, at $379.99, $19.96 cheaper, which does not close the gap in sound quality.
The JBL Xtreme 5 is the better-sounding, tougher pick. Removable battery. It is rated IP68 against IP54 for the Marshall Kilburn III. The tradeoff: High priced.
The Marshall Kilburn III is the longer-running choice. Spacious soundstage with broad stereo dispersion from Marshall’s True Stereophonic multi-driver layout, delivering warm, room-filling sound with 45Hz bass extension. It is rated for 50 hours of battery against 28 for the JBL Xtreme 5. It keeps a wired aux input, which the JBL Xtreme 5 lacks. The catch: Noticeable dips in the midrange compromise frequency response neutrality, making vocals and acoustic instruments sound somewhat recessed or muffled compared to more linear competitors like the JBL Xtreme 4 unless the bass dial is dialed back.
Buy the JBL Xtreme 5. It is rated higher for sound quality, and saving $19.96 with the Marshall Kilburn III does not make up for the sound-quality gap.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Specifications Side By Side
| JBL Xtreme 5 | Marshall Kilburn III | |
|---|---|---|
| Price | $399.95 | $379.99 |
| Ranked | #2 of 97 in Large Size Portable Bluetooth Speakers | #41 of 97 in Large Size Portable Bluetooth Speakers |
| App | Yes | Yes |
| Aux Input | No | Yes |
| Battery Life | 28 hours (Manufacturer specified) | 50 hours (Manufacturer specified) |
| EQ | Yes (7 band) | Yes |
| IP Rating | IP68 | IP54 |
| Maximum SPL | 110dB (measured by Alan Ross Reviews) | 91dB |
| Party Mode | Yes (Auracast) | Yes (Auracast) |
| Power Bank | Yes (USB-C, 5V/3A) | Yes |
| Power Input | USB-C | USB-C |
| Removable Battery | Yes | - |
| TWS | Yes | Yes |
| Weight | 6.4 lbs (2.9 kg) | 6.3 lbs (2.85 kg) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC, AAC, LC3 | SBC, AAC |
| Built-in Microphone | No | No |
| Stereo | Partially (1 woofer) | Yes |
| Omnidirectional | No | No |
| Bluetooth Version | 6.0 | 5.3 |
| Dimensions | 13.6” x 6.5” x 6.1” (346 x 165 x 155 mm) | 10.7” x 5.9” x 6.7” (272 x 150 x 170 mm) |
| Drivers | 98x145mm woofer, 2x 20mm tweeters + 2x passive radiators | 1x 4” woofer + 2x 2” full-range drivers |
| Frequency Response | 40Hz - 20kHz (Manufacturer specified) | 45Hz - 20kHz |
| Amplifier Power | 1 x 90W RMS Woofer + 2 x 20W RMS Tweeter (AC power mode) 1 x 60W RMS Woofer + 2 x 15W RMS Tweeter (Battery mode) | 50W |
| Digital Aux Input | Yes (USB-C) | No |
| Strap | Yes (detachable shoulder strap) | Yes (built-in strap) |
| Bass Extension (-10dB) | - | 45Hz |
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- JBL Xtreme 5 vs Minirig 3 with subwoofer
Prices on this page were last checked October 2, 2026 at 10:18 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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The Two Speakers In Full
JBL Xtreme 5: $399.95 Amazon B&H Photo Video eBay
Older models: the JBL Xtreme 3 (ranked lower, rated 4.3/5), the JBL Xtreme 4 (ranked lower, rated 3.8/5), the JBL Xtreme 2 (ranked lower, rated 3.4/5) and the JBL Xtreme (ranked lower, rated 3.2/5).
Pros: Removable battery. Quite deep bass, reaching well below 40Hz. A fantastic sounding speaker with excellent off-axis dispersion, a big step up from older JBL portables. Beats the Soundcore Boom 2 and Tribit Stormbox Blast on bass depth and clarity. Plays clean at volume, unlike the JBL Boombox 4.
Cons: High priced. Some bass boost. A hole in the mid-upper bass which can’t be EQ’d out. Default EQ presets are weak (Signature is boring, Chill and Vocal are close to unusable): needs the custom EQ to sound its best. Bigger and heavier than the Xtreme 4.
Setup: Try this Oluv EQ for the most neutral sound
Full JBL Xtreme 5 review and specifications →
| Amplifier Power | 1 x 90W RMS Woofer + 2 x 20W RMS Tweeter (AC power mode) 1 x 60W RMS Woofer + 2 x 15W RMS Tweeter (Battery mode) |
|---|---|
| App | Yes |
| Aux Input | No |
| Battery Life | 28 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC, AAC, LC3 |
| Bluetooth Version | 6.0 |
| Built-in Microphone | No |
| Digital Aux Input | Yes (USB-C) |
| Dimensions | 13.6” x 6.5” x 6.1” (346 x 165 x 155 mm) |
| Drivers | 98x145mm woofer, 2x 20mm tweeters + 2x passive radiators |
| EQ | Yes (7 band) |
| Frequency Response | 40Hz - 20kHz (Manufacturer specified) |
| IP Rating | IP68 |
| Maximum SPL | 110dB (measured by Alan Ross Reviews) |
| Omnidirectional | No |
| Party Mode | Yes (Auracast) |
| Power Bank | Yes (USB-C, 5V/3A) |
| Power Input | USB-C |
| Removable Battery | Yes |
| Stereo | Partially (1 woofer) |
| Strap | Yes (detachable shoulder strap) |
| TWS | Yes |
| Weight | 6.4 lbs (2.9 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Joy & Oluv’Sone🔈3DAudio🎧& Music: JBL Xtreme 5 - universal EQ for best sound overall More from Oluv’Sone →
- Joy & Oluv’Sone🔈3DAudio🎧& Music: JBL Xtreme 5 - Best Bluetooth Speaker 2026 award
- Joy & Oluv’Sone🔈3DAudio🎧& Music: JBL Xtreme 5 vs Studio Monitors: too V-shaped or not to V-shaped, that’s the question!
- Joy & Oluv’Sone🔈3DAudio🎧& Music: JBL Xtreme 5 - outdoor test
- Joy & Oluv’Sone🔈3DAudio🎧& Music: Minirigs 4 with Sub 4 vs JBL Xtreme 5 - 1st impressions
- Oluv Patreon: VIFA Helsinki & JBL Xtreme 5 - listening test
- Oluv Patreon: JBL Xtreme 5 - 1st detailed impression with custom EQs
- Oluv Patreon: JBL Xtreme 5 - outdoor test
- Alan Ross Reviews: Brane X vs JBL Xtreme 5: Maximum Bass, No Mercy More from alanrossreviews →
- Alan Ross Reviews: JBL Xtreme 5 2026, massive upgrade over JBL Xtreme 4! Full tests!
- Alan Ross Reviews: JBL Xtreme 5 vs JBL Xtreme 4 in 2026
- Alan Ross Reviews: https://www.youtube.com/watch?v=K5ImoaGw3t0
- Alan Ross Reviews: JBL Xtreme 5 or the amazing Tribit Stormbox Blast? 🤔
- Head-to-Head Comparisons
Marshall Kilburn III: $379.99 Amazon eBay
Older model: the Marshall Kilburn II (ranked lower, rated 3.8/5).
Pros: Spacious soundstage with broad stereo dispersion from Marshall’s True Stereophonic multi-driver layout, delivering warm, room-filling sound with 45Hz bass extension. Independent physical bass and treble dials allow quick tonal adjustments on the fly, backed by app-based EQ and placement compensation. Battery life is outstanding at up to 50+ hours with USB-C power-bank charging, IP54 splash resistance, 3.5mm aux input, and Bluetooth 5.3 with Auracast broadcast support. Measured bass extension of 45Hz (-10dB).
Cons: Noticeable dips in the midrange compromise frequency response neutrality, making vocals and acoustic instruments sound somewhat recessed or muffled compared to more linear competitors like the JBL Xtreme 4 unless the bass dial is dialed back. Kilburn II retains slightly punchier perceived loudness at maximum volume due to a more aggressive V-shaped contour. At 2.85 kg with only IP54 splash resistance, it is heavy and cannot withstand water immersion. Lacks a built-in microphone and LDAC codec support.
Full Marshall Kilburn III review and specifications →
| Amplifier Power | 50W |
|---|---|
| App | Yes |
| Aux Input | Yes |
| Bass Extension (-10dB) | 45Hz |
| Battery Life | 50 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC, AAC |
| Bluetooth Version | 5.3 |
| Built-in Microphone | No |
| Digital Aux Input | No |
| Dimensions | 10.7” x 5.9” x 6.7” (272 x 150 x 170 mm) |
| Drivers | 1x 4” woofer + 2x 2” full-range drivers |
| EQ | Yes |
| Frequency Response | 45Hz - 20kHz |
| IP Rating | IP54 |
| Maximum SPL | 91dB |
| Omnidirectional | No |
| Party Mode | Yes (Auracast) |
| Power Bank | Yes |
| Power Input | USB-C |
| Stereo | Yes |
| Strap | Yes (built-in strap) |
| TWS | Yes |
| Weight | 6.3 lbs (2.85 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Marshall Kilburn III vs Marshall Kilburn II
- Marshall Kilburn III vs JBL Xtreme 4
- Marshall Kilburn III vs Ultimate Ears Everboom
- Marshall Kilburn III vs W-King T9
- Marshall Kilburn III vs Marshall Middleton
- Marshall Kilburn III vs Devialet Mania
- Marshall Kilburn III vs Marshall Middleton II
- Marshall Kilburn III vs Sony ULT Field 5
- See all 31 comparisons