Different classes, so treat this as a step-up-or-not question rather than a head-to-head. The JBL Go 4 ranks #30 of 62 small speakers by sound quality at $49.95; the Sony ULT Field 1 ranks #99 of 179 medium speakers by sound quality at $138.
The JBL Go 4 is the lighter option. A pocket sized waterproof mini speaker with a loop for hanging and app EQ. At 0.4 lbs (190 g) it weighs much less than the Sony ULT Field 1 at 1.4 lbs (650 g). Watch for: Not much bass at all, especially with electronic/bass-heavy tracks pushed past ~50% volume.
The Sony ULT Field 1 is the longer-running pick. A tough, waterproof small speaker that survives drops, with long real world battery life and stereo pairing. It is rated for 12 hours of battery against 7 for the JBL Go 4. It supports AAC Bluetooth, which the JBL Go 4 lacks. Watch for: Upper midrange peak, rolled off treble.
Buy the JBL Go 4 ($49.95) for a small speaker; the Sony ULT Field 1 ($138) suits 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
| JBL Go 4 | Sony ULT Field 1 | |
|---|---|---|
| Price | $49.95 | $138.00 |
| Ranked | #30 of 62 in Small Size Portable Bluetooth Speakers | #99 of 179 in Medium Size Portable Bluetooth Speakers |
| App | Yes | Yes |
| Bass Extension (-10dB) | ~82Hz | - |
| Battery Life | 7 hours (Manufacturer specified) | 12 hours (Manufacturer specified) |
| EQ | Yes | Yes |
| IP Rating | IP67 | IP67 |
| Party Mode | Yes (Auracast) | Yes (Party Connect up to 100 speakers) |
| Power Bank | No | No |
| Power Input | USB-C | USB-C |
| Stereo | No | No |
| Omnidirectional | Pointing up | No |
| TWS | Yes | Yes |
| Weight | 0.4 lbs (190 g) | 1.4 lbs (650 g) |
| Aux Input | No | No |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | AAC, SBC |
| Built-in Microphone | Yes | Yes |
| Bluetooth Version | 5.3 | 5.3 |
| Frequency Response | 90Hz - 20kHz (Manufacturer specified) | - |
| Dimensions | 3.7” x 3” x 1.7” (94.3 x 75.7 x 42.2 mm) | 8.1” x 3” x 3” (206 x 77 x 76 mm) |
| Charging Time | 3 hours | - |
| Drivers | 45mm | 83mm x 42mm woofer, 16mm tweeter + passive radiator |
| Amplifier Power | 4.2W | - |
| Digital Aux Input | No | No |
| Strap | Yes (built-in loop) | Yes (detachable strap) |
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