Short answer: the Kilburn II, since the Everboom’s data is still limited. The Everboom’s ranking may shift as more sound samples come in, and it has an upper bass boost with warm, rolled-off treble. The Kilburn II packs a 20W Class D amp with dual 8W tweeters, over 20 hours of battery, a 20 minute quick-charge worth 3 hours and a rugged leather-handled build, but it boosts upper bass, peaks in the upper mids and charges over AC.
In favor of the Ultimate Ears Everboom: There’s limited data so far, with its ranking possibly shifting as more sound samples come in. The downside: it has an upper bass boost, a warm tuning with rolled off treble, and bass that doesn’t go very deep.
Buy the Ultimate Ears Everboom. It is rated higher for sound quality than the Marshall Kilburn II and costs less, so it is the default pick unless a specific strength of the other one matters more to you.
If water resistance matters to you, the Ultimate Ears Everboom at IP67 (brief submersion) holds up far better than the Marshall Kilburn II at IPX2 (light drips).
Want more options? Browse the full Portable Bluetooth rankings.
Specifications Side By Side
| Marshall Kilburn II | Ultimate Ears Everboom | |
|---|---|---|
| Price | $279.00 | $117.17 |
| Ranked | #39 of 83 in Large Size Portable Bluetooth Speakers | #35 of 83 in Large Size Portable Bluetooth Speakers |
| Aux Input | Yes | Yes |
| Bass Extension (-10dB) | ~58Hz | - |
| Battery Life | 20 hours (Manufacturer specified) | 20 hours (Manufacturer specified) |
| IP Rating | IPX2 | IP67 |
| Weight | 5.5 lbs (2.49 kg) | 2.1 lbs (949 g) |
| App | No | Yes |
| Bluetooth Codecs | SBC | SBC |
| Built-in Microphone | Yes | Yes |
| EQ | No | Yes |
| Party Mode | No | Yes (PartyUp up to 50 speakers) |
| Power Bank | No | No |
| Power Input | USB-C | USB-C |
| Stereo | Yes | No |
| Omnidirectional | No | Yes |
| TWS | Yes | No |
| Amplifier Power | 36W | 14W |
| Dimensions | 9.6” x 6.4” x 5.5” (243 x 162 x 140 mm) | 8.1” x 3.3” x 4.3” (205 x 85 x 110 mm) |
| Drivers | 1x 4” (102mm) woofer + 2x 20mm dome tweeters | 2x 56.6mm x 56.2mm fullrange transducers + 2x passive radiators |
| Maximum SPL | 102dB (Manufacturer specified) | - |
| Digital Aux Input | No | No |
| Bluetooth Version | 5.0 | 5.1 |
| Strap | Yes (built-in strap) | Yes (built-in loop) |
Related Speaker Comparisons
How Ultimate Ears Everboom compares with other leading options:
- Ultimate Ears Everboom vs Vifa Helsinki
- JBL Xtreme 5 vs Ultimate Ears Everboom
- Tribit Stormbox Lava vs Ultimate Ears Everboom
- Ultimate Ears Everboom vs Brane X
- Minirig 4 with subwoofer vs Ultimate Ears Everboom
Prices on this page were last checked September 26, 2026 at 11:14 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.
As an eBay Partner, we may be compensated if you make a purchase.
The Two Speakers In Full
Marshall Kilburn II: $279.00 Amazon eBay
Pros: 20W Class D amp + dual 8W tweeters. 20+ hour battery with quick-charge (20 min charges 3 hours of play). Rugged design with leather handle and reinforced corners, IPX2 rated. Thrives with rock music. Bluetooth 5.0 with 30ft range. Measured bass extension of ~58Hz (-10dB).
Cons: Boosted upper bass, not very detailed, not as deep bass as competitors, upper mids peak. Very low IPX2 water rating. AC charging
Full Marshall Kilburn II review and specifications →
| Amplifier Power | 36W |
|---|---|
| App | No |
| Aux Input | Yes |
| Bass Extension (-10dB) | ~58Hz |
| Battery Life | 20 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.0 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 9.6” x 6.4” x 5.5” (243 x 162 x 140 mm) |
| Drivers | 1x 4” (102mm) woofer + 2x 20mm dome tweeters |
| EQ | No |
| IP Rating | IPX2 |
| Maximum SPL | 102dB (Manufacturer specified) |
| Omnidirectional | No |
| Party Mode | No |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | Yes |
| Strap | Yes (built-in strap) |
| TWS | Yes |
| Weight | 5.5 lbs (2.49 kg) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Marshall Kilburn II vs Xdobo Bucket /BMTL Bucket / Zicoroop Ts
- Marshall Kilburn II vs JBL Xtreme 4
- Marshall Kilburn II vs W-King T9
- Marshall Kilburn II vs Marshall Middleton
- Marshall Kilburn II vs Devialet Mania
- Marshall Kilburn II vs Sony ULT Field 5
- Marshall Kilburn II vs LG Xboom Bounce
- Marshall Kilburn II vs Sony SRS-XB43
- See all 59 comparisons
Ultimate Ears Everboom: $117.17 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 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
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Ultimate Ears Everboom vs Marshall Middleton
- Ultimate Ears Everboom vs LG Xboom Bounce
- Ultimate Ears Everboom vs Marshall Middleton II
- Ultimate Ears Everboom vs Sonos Move
- Ultimate Ears Everboom vs JBL Xtreme 4
- Ultimate Ears Everboom vs Sonos Move 2
- Ultimate Ears Everboom vs W-King T9
- Ultimate Ears Everboom vs Soundcore Motion X500
- See all 47 comparisons