Short answer: the Marshall Kilburn II for the higher ranking, the Sony ULT Field 5 for the lower price. The Marshall Kilburn II ranks #35 of 75 large speakers at $279. The Sony ULT Field 5 ranks #40 at $198, $81 cheaper.
The case for the Marshall Kilburn II: 20W Class D amp + dual 8W tweeters. The tradeoff: Boosted upper bass, not very detailed, not as deep bass as competitors, upper mids peak.
What the Sony ULT Field 5 gets right: IP67 rated, dustproof and water resistant. The catch: Bass not as deep as others in the category, and sound quality overall is just okay.
Buy the Marshall Kilburn II if the ranking matters more than the price. Buy the Sony ULT Field 5 if the price matters more than the ranking.
Specifications Side By Side
| Marshall Kilburn II | Sony ULT Field 5 | |
|---|---|---|
| Price | $279.00 | $198 |
| Ranked | #35 of 75 in Large Size Portable Bluetooth Speakers | #40 of 75 in Large Size Portable Bluetooth Speakers |
| Aux Input | Yes | Yes |
| Bass Extension (-10dB) | ~58Hz | - |
| Battery Life | 20 hours (Manufacturer specified) | 25 hours (Manufacturer specified) |
| IP Rating | IPX2 | IP67 |
| Weight | 5.5 lbs / 2.49 kg | 7.3 lbs / 3.3 kg |
| App | No | Yes |
| Bluetooth Codecs | SBC | SBC, AAC, LDAC |
| Built in Microphone | Yes | Yes |
| EQ | No | Yes (App + ULT button) |
| Party Mode | No | Yes (Party Connect up to 100 speakers) |
| Power Bank | No | Yes |
| Power Input | USB-C | USB-C |
| Stereo | Yes | Yes |
| TWS | Yes | Yes |
| Output Power | 36W | 27W |
| Dimensions | 243mm x 162mm x 140mm | 12.6" x 5.67" x 4.92" (320 x 144 x 125 mm) |
| Drivers | 1x 4" (102mm) woofer + 2x 20mm dome tweeters | 2x 46mm tweeters + 1x 79mm x 107mm woofer |
| Max Volume | 102dB | - |
| Bluetooth Version | - | 5.3 |
The Two Speakers In Full
Marshall Kilburn II: $279.00 Amazon
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
| App | No |
|---|---|
| Aux Input | Yes |
| Bass Extension (-10dB) | ~58Hz |
| Battery Life | 20 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Built in Microphone | Yes |
| Dimensions | 243mm x 162mm x 140mm |
| Drivers | 1x 4" (102mm) woofer + 2x 20mm dome tweeters |
| EQ | No |
| IP Rating | IPX2 |
| Max Volume | 102dB |
| 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
- Links
Sony ULT Field 5: $198 Amazon
Pros: IP67 rated, dustproof and water resistant. 25 hour battery life. App with 10-band EQ. Party Connect with up to 100 speakers. USB-C in/out for charging your phone.
Cons: Bass not as deep as others in the category, and sound quality overall is just okay. ULT button makes a really loud tone when pressed. Just an okay speaker.
| App | Yes |
|---|---|
| Aux Input | Yes |
| Battery Life | 25 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC, AAC, LDAC |
| Bluetooth Version | 5.3 |
| Built in Microphone | Yes |
| Dimensions | 12.6" x 5.67" x 4.92" (320 x 144 x 125 mm) |
| Drivers | 2x 46mm tweeters + 1x 79mm x 107mm woofer |
| EQ | Yes (App + ULT button) |
| IP Rating | IP67 |
| Output Power | 27W |
| Party Mode | Yes (Party Connect up to 100 speakers) |
| Power Bank | Yes |
| Power Input | USB-C |
| Stereo | Yes |
| TWS | Yes |
| Weight | 7.3 lbs / 3.3 kg |
- Reviews, Comparisons and Sound Samples
- Danny Pops: Don’t TOUCH that ULT Button! Sony ULT Field 5 Review
- Mark Ellis Reviews: Sony just changed summer sound 🤨 | Sony ULT Field 5 & 3 Review
- Dominik Reviews: Sony ULT Field 5 vs JBL Xtreme 4 - Outdoor Sound Test - Sony shines or not?
- Joy & Oluv’Sone: Sony ULT Field 5 vs Anker SoundCore Boom 2 - listening test
- Head-to-Head Comparisons
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- Links
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Product prices and availability were last checked August 9, 2026 at 6:57 AM UTC 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.