Short answer: the Ultimate Ears Everboom. It ranks #35 of 97 large speakers by sound quality, rated 3.9/5, at $149.99; the Marshall Kilburn III ranks #41, rated 3.8/5, and costs $379.99, which makes this an easy call rather than a real tradeoff.
The Ultimate Ears Everboom is the lighter, tougher choice. At 2.1 lbs (949 g) it weighs much less than the Marshall Kilburn III at 6.3 lbs (2.85 kg). It is rated IP67 against IP54 for the Marshall Kilburn III. Watch for: Careful placement and volume setting remain important for balanced sound.
The Marshall Kilburn III is the longer-running pick. 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 20 for the Ultimate Ears Everboom. It supports AAC Bluetooth, which the Ultimate Ears Everboom lacks. It plays in stereo from a single unit, unlike the Ultimate Ears Everboom. The tradeoff: 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 Ultimate Ears Everboom. It is rated higher for sound quality than the Marshall Kilburn III and costs less, which makes it the one to get unless you need something the other one does better.
Want more options? Browse the full Portable Bluetooth rankings.
Specifications Side By Side
| Ultimate Ears Everboom | Marshall Kilburn III | |
|---|---|---|
| Price | $149.99 | $379.99 |
| Ranked | #35 of 97 in Large Size Portable Bluetooth Speakers | #41 of 97 in Large Size Portable Bluetooth Speakers |
| App | Yes | Yes |
| Battery Life | 20 hours (Manufacturer specified) | 50 hours (Manufacturer specified) |
| EQ | Yes | Yes |
| IP Rating | IP67 | IP54 |
| Party Mode | Yes (PartyUp up to 50 speakers) | Yes (Auracast) |
| Power Bank | No | Yes |
| Power Input | USB-C | USB-C |
| Stereo | No | Yes |
| Omnidirectional | Yes | No |
| TWS | No | Yes |
| Weight | 2.1 lbs (949 g) | 6.3 lbs (2.85 kg) |
| Aux Input | Yes | Yes |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC, AAC |
| Built-in Microphone | Yes | No |
| Bluetooth Version | 5.1 | 5.3 |
| Dimensions | 8.1” x 3.3” x 4.3” (205 x 85 x 110 mm) | 10.7” x 5.9” x 6.7” (272 x 150 x 170 mm) |
| Drivers | 2x 56.6mm x 56.2mm fullrange transducers + 2x passive radiators | 1x 4” woofer + 2x 2” full-range drivers |
| Amplifier Power | 14W | 50W |
| Digital Aux Input | No | No |
| Strap | Yes (built-in loop) | Yes (built-in strap) |
| Bass Extension (-10dB) | - | 45Hz |
| Frequency Response | - | 45Hz - 20kHz |
| Maximum SPL | - | 91dB |
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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
Ultimate Ears Everboom: $149.99 Amazon eBay
Pros: Ultimate Ears Everboom uses 2x 56.6mm x 56.2mm fullrange transducers + 2x passive radiators. Its 949 g, claimed 20 hours (Manufacturer specified) battery life, IP67 protection, aux input and mono playback make it a practical option for its intended room or portable use.
Cons: Careful placement and volume setting remain important for balanced sound. Warm tuning with an upper-bass boost and rolled-off treble, and the bass does not go very deep.
Full Ultimate Ears Everboom review and specifications →
| Amplifier Power | 14W |
|---|---|
| App | Yes |
| Aux Input | Yes |
| Battery Life | 20 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.1 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 8.1” x 3.3” x 4.3” (205 x 85 x 110 mm) |
| Drivers | 2x 56.6mm x 56.2mm fullrange transducers + 2x passive radiators |
| EQ | Yes |
| IP Rating | IP67 |
| Omnidirectional | Yes |
| Party Mode | Yes (PartyUp up to 50 speakers) |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | No |
| Strap | Yes (built-in loop) |
| TWS | No |
| Weight | 2.1 lbs (949 g) |
- Links
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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
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