These are not really the same size class, and that is the honest framing here. The Marshall Middleton II ranks #31 of 120 large speakers by sound quality at $279.99; the Turtlebox Gen 3 ranks #105 of 113 boombox speakers by sound quality at $430.
The Marshall Middleton II is the deeper-bass, lighter choice. A waterproof stereo speaker with very deep bass for its size, a long battery, a power bank and an app EQ. Its bass reaches about 38Hz before falling 10dB, against 65Hz for the Turtlebox Gen 3. At 4 lbs (1.8 kg) it weighs much less than the Turtlebox Gen 3 at 10 lbs (4.54 kg). It has an adjustable EQ, which the Turtlebox Gen 3 lacks. Watch for: Bass boosted which drowns out the midrange.
Why pick the Turtlebox Gen 3: A loud, waterproof and crushproof outdoor speaker with a big battery, device charging and party mode linking. Watch for: Sounds basically identical to the original and the Turtlebox Gen 2: each generation mainly added features, not sound quality.
Buy the Marshall Middleton II ($279.99) for a large speaker; the Turtlebox Gen 3 ($430) suits a boombox 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 II | Turtlebox Gen 3 | |
|---|---|---|
| Price | $279.99 | $430.00 |
| Ranked | #31 of 120 in Large Size Portable Bluetooth Speakers | #105 of 113 in Boombox Size Portable Bluetooth Speakers |
| App | Yes | No |
| Aux Input | Yes | Yes |
| Bass Extension (-10dB) | 38Hz | ~65Hz |
| Battery Life | 30 hours (Manufacturer specified) | 25 hours (Manufacturer specified) |
| Built-in Microphone | Yes | No |
| EQ | Yes (5 band) | No |
| IP Rating | IP67 | IP67 |
| Party Mode | Yes (Marshall Stack) | Yes (Turtlebox Party Mode) |
| Power Bank | Yes (USB-C) | Yes (USB-C) |
| Power Input | USB-C | DC Barrel Connector (15V/3A) |
| Weight | 4 lbs (1.8 kg) | 10 lbs (4.54 kg) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Bluetooth Version | 5.3 | 5.4 |
| Dimensions | 9.1” x 3.9” x 4.3” (230 x 98 x 110 mm) | 12” x 7” x 8.7” (305 x 178 x 222 mm) |
| Drivers | 2x 75mm woofers, 2x 0.625” tweeters + 2x passive radiators | 1x 6x9” (152x228mm) woofer + 1x 1” (25mm) tweeter |
| Frequency Response | 50Hz - 20kHz (Manufacturer specified) | - |
| Amplifier Power | 80W | 50W |
| Digital Aux Input | No | No |
| Strap | Yes (detachable strap) | No |
| MicroSD Playback | - | Yes |
| USB Playback | - | No |
| Microphone Input | - | Yes (3.5mm) |
| Battery Capacity | - | 85Wh |
| Maximum SPL | - | 102dB (measured by Williston Audio Labs) |
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