Short answer: the Marshall Kilburn II for better sound quality, the Ultimate Ears Megablast for the lower price. The Marshall Kilburn II ranks #36 of 77 large speakers at $279. The Ultimate Ears Megablast ranks #61 at $240, $39 cheaper.
What the Marshall Kilburn II offers: 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. Watch for: Boosted upper bass, not very detailed, not as deep bass as competitors, upper mids peak. Very low IPX2 water rating. AC charging
What the Ultimate Ears Megablast offers: Alexa integration (Wi-Fi + Bluetooth). 93dB loudest in UE lineup, 40% louder than Megaboom. IP67 waterproof and drop-proof. 16 hour battery. Party mode connects up to 8 speakers. Can use while charging to keep Alexa on 24/7. Watch for: Bass is not very deep compared to the competition
Buy the Marshall Kilburn II if sound quality is the priority over the price, or the Ultimate Ears Megablast if the price is the priority over sound quality.
Skip the Ultimate Ears Megablast if sound quality matters to you. It ranks near the bottom of the 77 large speakers.
Water resistance is not close: the Ultimate Ears Megablast is rated at IPX7 (brief submersion), well ahead of the Marshall Kilburn II at IPX2 (light drips).
Specifications Side By Side
| Marshall Kilburn II | Ultimate Ears Megablast | |
|---|---|---|
| Price | $279.00 | $240 Discontinued |
| Ranked | #36 of 77 in Large Size Portable Bluetooth Speakers | #61 of 77 in Large Size Portable Bluetooth Speakers |
| Aux Input | Yes | Yes |
| Bass Extension (-10dB) | ~58Hz | 64Hz |
| Battery Life | 20 hours (Manufacturer specified) | 16 hours (Manufacturer specified) |
| IP Rating | IPX2 | IPX7 |
| Weight | 5.5 lbs / 2.49 kg | 2.4 lbs / 1.1 kg |
| App | No | No |
| Bluetooth Codecs | SBC | SBC |
| Built in Microphone | Yes | Yes |
| EQ | No | No |
| Party Mode | No | No |
| Power Bank | No | No |
| Power Input | USB-C | USB-C |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Output Power | 36W | Specs not published by manufacturer |
| Dimensions | 9.6" x 6.4" x 5.5" (243 x 162 x 140 mm) | 9.3" x 3.5" (236.2 x 88.9 mm) (height x diameter) |
| Drivers | 1x 4" (102mm) woofer + 2x 20mm dome tweeters | 2x 55mm fullrange, 2x 25mm tweeters |
| Max Volume | 102dB | - |
| Digital Aux Input | No | No |
| Bluetooth Version | - | 4.2 |
| Frequency Response | - | 60Hz - 20kHz (Manufacturer specified) |
| Discontinued | - | Yes |
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Prices on this page were last checked August 27, 2026 at 10:09 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
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.
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 →
| App | No |
|---|---|
| Aux Input | Yes |
| Bass Extension (-10dB) | ~58Hz |
| Battery Life | 20 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| 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 |
| Max Volume | 102dB |
| Omnidirectional | No |
| Output Power | 36W |
| Party Mode | No |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | Yes |
| 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 Ultimate Ears Everboom
- Marshall Kilburn II vs Sony ULT Field 5
- Marshall Kilburn II vs Marshall Middleton
- Marshall Kilburn II vs Sony SRS-XB43
- Marshall Kilburn II vs LG Xboom Bounce
- See all 39 comparisons
Ultimate Ears Megablast: $240 Discontinued Ultimate Ears Megablast eBay
Pros: Alexa integration (Wi-Fi + Bluetooth). 93dB loudest in UE lineup, 40% louder than Megaboom. IP67 waterproof and drop-proof. 16 hour battery. Party mode connects up to 8 speakers. Can use while charging to keep Alexa on 24/7.
Cons: Bass is not very deep compared to the competition. Discontinued.
Full Ultimate Ears Megablast review and specifications →
| App | No |
|---|---|
| Aux Input | Yes |
| Bass Extension (-10dB) | 64Hz |
| Battery Life | 16 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 4.2 |
| Built in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 9.3" x 3.5" (236.2 x 88.9 mm) (height x diameter) |
| Discontinued | Yes |
| Drivers | 2x 55mm fullrange, 2x 25mm tweeters |
| EQ | No |
| Frequency Response | 60Hz - 20kHz (Manufacturer specified) |
| IP Rating | IPX7 |
| Omnidirectional | No |
| Output Power | Specs not published by manufacturer |
| Party Mode | No |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | Yes |
| TWS | Yes |
| Weight | 2.4 lbs / 1.1 kg |
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