Short answer: the TOZO PA1. It ranks #60 of 179 medium speakers by sound quality, rated 3.5/5, at $39.99; the Sony ULT Field 1 ranks #99, rated 3.1/5, and costs $138, which makes this an easy call rather than a real tradeoff.
The TOZO PA1 is the better-sounding, longer-running pick. A budget water resistant speaker with very long battery life, app EQ and pairing with a second unit. It is rated for 25 hours of battery against 12 for the Sony ULT Field 1. The tradeoff: Bass is limited, fading by about 52Hz.
The case for the Sony ULT Field 1: A tough, waterproof small speaker that survives drops, with long real world battery life and stereo pairing. The tradeoff: Upper midrange peak, rolled off treble.
Buy the TOZO PA1. It is rated higher for sound quality than the Sony ULT Field 1 and costs less, so only choose the other one for a particular feature it does better.
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
| TOZO PA1 | Sony ULT Field 1 | |
|---|---|---|
| Price | $39.99 | $138.00 |
| Ranked | #60 of 179 in Medium Size Portable Bluetooth Speakers | #99 of 179 in Medium Size Portable Bluetooth Speakers |
| Bass Extension (-10dB) | 52Hz | - |
| Battery Life | 25 hours (Manufacturer specified) | 12 hours (Manufacturer specified) |
| Bluetooth Latency | 220ms | - |
| Maximum SPL | 98dB (measured by Alan Ross Reviews) | - |
| Stereo | No | No |
| Omnidirectional | No | No |
| Weight | 1.3 lbs (581 g) | 1.4 lbs (650 g) |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 5.0 | 5.3 |
| Drivers | 67mm fullrange | 83mm x 42mm woofer, 16mm tweeter + passive radiator |
| Dimensions | 8.3” x 3.6” x 2.4” (210 x 91 x 61 mm) | 8.1” x 3” x 3” (206 x 77 x 76 mm) |
| Frequency Response | 55Hz - 18kHz (Manufacturer specified) | - |
| Amplifier Power | 20W | - |
| IP Rating | IPX6 | IP67 |
| Digital Aux Input | No | No |
| Bluetooth Codecs | SBC, AAC | AAC, SBC |
| App | Yes | Yes |
| Aux Input | No | No |
| EQ | Yes | Yes |
| TWS | Yes | Yes |
| Power Input | USB-C | USB-C |
| Strap | Yes (lanyard) | Yes (detachable strap) |
| Built-in Microphone | - | Yes |
| Party Mode | - | Yes (Party Connect up to 100 speakers) |
| Power Bank | - | No |
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