These sit in different size classes, so this is not a straight ranking comparison. The Marshall Middleton ranks #33 of 120 large speakers by sound quality at $257.52; the Sony ULT Field 3 ranks #71 of 179 medium speakers by sound quality at $208.
Why pick the Marshall Middleton: A waterproof stereo speaker with very deep bass for its size, a long battery, a power bank and a detachable strap. It keeps a wired aux input, which the Sony ULT Field 3 lacks. The catch: 5db dip at 1.7kHz and 6.3kHz.
The Sony ULT Field 3 is the lighter choice. 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 at 4 lbs (1.8 kg). It supports LDAC Bluetooth, which the Marshall Middleton lacks. It has an adjustable EQ, which the Marshall Middleton lacks. The tradeoff: Sounds a bit hollow, a bit boosted in the treble.
Buy the Marshall Middleton at $257.52 for a large speaker, or the Sony ULT Field 3 at $208 for a medium speaker instead.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
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 | Sony ULT Field 3 | |
|---|---|---|
| Price | $257.52 | $208.00 |
| Ranked | #33 of 120 in Large Size Portable Bluetooth Speakers | #71 of 179 in Medium Size Portable Bluetooth Speakers |
| Aux Input | Yes | No |
| Bass Extension (-10dB) | 39Hz | - |
| Battery Life | 20 hours (Manufacturer specified) | 24 hours (Manufacturer specified) |
| Maximum SPL | 99dB (measured by Alan Ross Reviews) | - |
| Party Mode | Yes (Marshall Stack) | Yes (Party Connect up to 100 speakers) |
| Power Bank | Yes (USB-C) | Yes (USB-C, 5V/1.5A) |
| Weight | 4 lbs (1.8 kg) | 2.6 lbs (1.2 kg) |
| App | No | Yes |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC, AAC, LDAC |
| Built-in Microphone | Yes | Yes |
| EQ | No | Yes (App + ULT button) |
| IP Rating | IPX7 | IP67 |
| Power Input | USB-C | USB-C |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Bluetooth Version | 5.1 | 5.2 |
| Dimensions | 9.1” x 3.7” x 4.3” (230 x 95 x 109 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 | 50W | 27W |
| Digital Aux Input | No | No |
| Strap | Yes (detachable strap) | Yes (detachable shoulder strap) |
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