Short answer: the Sony ULT Field 5 for weatherproofing, the Stockwell II for sound. The ULT Field 5 is IP67 rated against dust and water, but its bass is not as deep as others in the category and its sound is just okay. The Stockwell II may be the most natural sounding Marshall speaker, though it is not stereo.
Buy the Marshall Stockwell II. It is rated higher for sound quality than the Sony ULT Field 5 and costs less, so it is the default pick unless a specific strength of the other one matters more to you.
If water resistance matters to you, the Sony ULT Field 5 at IP67 (brief submersion) holds up far better than the Marshall Stockwell II at IPX4 (splashing).
Want more options? Browse the full 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.
As an eBay Partner, we may be compensated if you make a purchase.
Specifications Side By Side
| Marshall Stockwell II | Sony ULT Field 5 | |
|---|---|---|
| Price | $229.99 | $348.00 |
| Ranked | #11 of 120 in Large Size Portable Bluetooth Speakers | #59 of 120 in Large Size Portable Bluetooth Speakers |
| Aux Input | Yes | Yes |
| Bass Extension (-10dB) | 44Hz | - |
| Battery Life | 20 hours (Manufacturer specified) | 25 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC, AAC, LDAC |
| IP Rating | IPX4 | IP67 |
| Bluetooth Latency | 50ms | - |
| Maximum SPL | 96dB (measured by Alan Ross Reviews) | - |
| Party Mode | No | Yes (Party Connect up to 100 speakers) |
| Power Input | USB-C | USB-C |
| Stereo | No | Yes |
| Omnidirectional | Yes | No |
| TWS | No | Yes |
| Weight | 3.1 lbs (1.4 kg) | 7.3 lbs (3.3 kg) |
| App | No | Yes |
| Built-in Microphone | Yes | Yes |
| EQ | No | Yes (App + ULT button) |
| Power Bank | No | Yes (USB-C) |
| Bluetooth Version | 5.0 | 5.3 |
| Dimensions | 7.1” x 6.3” x 2.8” (180 x 161 x 70 mm) | 12.6” x 5.7” x 4.9” (320 x 144 x 125 mm) |
| Drivers | 3” woofer, 2x 2” fullrange tweeters | 2x 46mm tweeters + 1x 79mm x 107mm woofer |
| Frequency Response | 60Hz - 20kHz (Manufacturer specified) | - |
| Amplifier Power | 20W | 27W |
| Digital Aux Input | No | No |
| Strap | Yes (built-in strap) | Yes (detachable shoulder strap) |
Related Speaker Comparisons
How Marshall Stockwell II compares with other leading options: