Short answer: the Treblab HD77. Both are rated 3.1/5 for sound quality (#100 and #99 of 179 medium speakers), and the Treblab HD77 costs $69.97 against $138 for the Sony ULT Field 1, so with nothing between them on sound quality, price settles it.
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. It has an adjustable EQ, which the Treblab HD77 lacks. The catch: Upper midrange peak, rolled off treble.
The Treblab HD77 is the longer-running choice. An affordable speaker with an aux input, long battery life, a speakerphone mic and pairing with a second unit. It is rated for 20 hours of battery against 12 for the Sony ULT Field 1. It keeps a wired aux input, which the Sony ULT Field 1 lacks. The tradeoff: Lacking quite a bit of bass compared to higher ranked speakers.
Buy the Treblab HD77. Both are rated the same for sound quality, and it costs $68.03 less than the Sony ULT Field 1.
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.
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Specifications Side By Side
| Sony ULT Field 1 | Treblab HD77 | |
|---|---|---|
| Price | $138.00 | $69.97 |
| Ranked | #99 of 179 in Medium Size Portable Bluetooth Speakers | #100 of 179 in Medium Size Portable Bluetooth Speakers |
| App | Yes | No |
| Aux Input | No | Yes |
| Battery Life | 12 hours (Manufacturer specified) | 20 hours (Manufacturer specified) |
| Built-in Microphone | Yes | Yes |
| EQ | Yes | No |
| IP Rating | IP67 | IPX7 |
| Party Mode | Yes (Party Connect up to 100 speakers) | - |
| Power Bank | No | - |
| Power Input | USB-C | USB-C |
| Stereo | No | No (front/rear drivers) |
| Omnidirectional | No | Yes |
| TWS | Yes | Yes |
| Weight | 1.4 lbs (650 g) | 1.4 lbs (637 g) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | AAC, SBC | SBC (additional codecs unverified) |
| Bluetooth Version | 5.3 | 5.0 |
| Dimensions | 8.1” x 3” x 3” (206 x 77 x 76 mm) | 7.4” x 3” x 3” (187 x 76 x 76 mm) |
| Drivers | 83mm x 42mm woofer, 16mm tweeter + passive radiator | 2x 48mm fullrange |
| Digital Aux Input | No | No |
| Strap | Yes (detachable strap) | - |
| Bass Extension (-10dB) | - | ~66Hz |
| Wi-Fi | - | No |
| Frequency Response | - | 50Hz - 20kHz (Manufacturer specified) |
| Amplifier Power | - | 25W RMS |
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