Different classes, so treat this as a step-up-or-not question rather than a head-to-head. The Marshall Middleton II ranks #31 of 120 large speakers by sound quality at $279.99; the Sony ULT Field 3 ranks #71 of 179 medium speakers by sound quality at $208.
Why pick the Marshall Middleton II: A waterproof stereo speaker with very deep bass for its size, a long battery, a power bank and an app EQ. It keeps a wired aux input, which the Sony ULT Field 3 lacks. The tradeoff: Bass boosted which drowns out the midrange.
The Sony ULT Field 3 is the lighter pick. A rugged waterproof stereo speaker with long battery life, a detailed app EQ, a shoulder strap and a phone charging port. At 2.6 lbs (1.2 kg) it weighs noticeably less than the Marshall Middleton II at 4 lbs (1.8 kg). It supports LDAC Bluetooth, which the Marshall Middleton II lacks. The catch: Sounds a bit hollow, a bit boosted in the treble.
Buy the Marshall Middleton II at $279.99 if you want a large speaker. Buy the Sony ULT Field 3 at $208 if you want a medium speaker instead.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Prices on this page were last checked November 7, 2026 at 7:34 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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Specifications Side By Side
| Marshall Middleton II | Sony ULT Field 3 | |
|---|---|---|
| Price | $279.99 | $208.00 |
| Ranked | #31 of 120 in Large Size Portable Bluetooth Speakers | #71 of 179 in Medium Size Portable Bluetooth Speakers |
| App | Yes | Yes |
| Aux Input | Yes | No |
| Bass Extension (-10dB) | 38Hz | - |
| Battery Life | 30 hours (Manufacturer specified) | 24 hours (Manufacturer specified) |
| Built-in Microphone | Yes | Yes |
| EQ | Yes (5 band) | Yes (App + ULT button) |
| IP Rating | IP67 | IP67 |
| Party Mode | Yes (Marshall Stack) | Yes (Party Connect up to 100 speakers) |
| Power Bank | Yes (USB-C) | Yes (USB-C, 5V/1.5A) |
| Power Input | USB-C | USB-C |
| Weight | 4 lbs (1.8 kg) | 2.6 lbs (1.2 kg) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC, AAC, LDAC |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Bluetooth Version | 5.3 | 5.2 |
| Dimensions | 9.1” x 3.9” x 4.3” (230 x 98 x 110 mm) | 10.1” x 4.4” x 3.1” (256 x 113 x 79 mm) |
| Drivers | 2x 75mm woofers, 2x 0.625” tweeters + 2x passive radiators | 1x 20mm tweeter + 1x 86mm x 46mm woofer |
| Frequency Response | 50Hz - 20kHz (Manufacturer specified) | - |
| Amplifier Power | 80W | 27W |
| Digital Aux Input | No | No |
| Strap | Yes (detachable strap) | Yes (detachable shoulder strap) |
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