Portable Bluetooth Speaker Sony ULT FIELD 1 — Mono tube design, 30 W RMS (20 W woofer + 10 W tweeter), IP67, 12 hr battery, Bluetooth 30 m, black

The ULT FIELD 1 is the smallest, most portable speaker in the ULT POWER SOUND range. Despite its compact size, it delivers powerful sound from a combination of a dedicated woofer, a high-quality tweeter and two passive radiators that enhance bass response. The speaker is rated IP67 for water and dust protection, offers shock resistance, and includes an adjustable strap for easy carrying; it can be used horizontally or vertically to suit placement and listening preferences.

Advantages

Compact and lightweight design makes the ULT FIELD 1 easy to carry and fit into a bag while offering a high-output audio performance. The dedicated ULT button boosts bass and increases sound pressure for deeper low frequencies and greater perceived volume. IP67 protection and shock resistance ensure reliable use outdoors and in demanding environments. Fast Pair support and Bluetooth compatibility make connecting Android and iOS devices quick, and the speaker can be paired with a second ULT FIELD 1 for stereo playback. Built-in microphone and echo-cancelling technology enable clear hands-free calls.

Key specifications

• Speaker type: Mono portable speaker
• Model reference: ULT FIELD 1 (Tube 30 W Black)
• Transducers: Woofer and tweeter with two passive radiators
• Wireless: Bluetooth (Fast Pair compatible)
• Microphone: Built-in (echo cancelling)
• Battery: Built-in Lithium‑Ion 2900 mAh
• Battery life: Up to 12 hours
• Ingress protection: IP67 (waterproof, dustproof)
• Durability: Shockproof

How to use

Charge the speaker fully before first use. Turn on Bluetooth on your mobile device and use standard pairing or the Fast Pair feature for quick connection. Place the ULT FIELD 1 horizontally or vertically depending on available space; use the adjustable strap to carry it or attach it as needed. Press the ULT button to enable the bass boost and higher sound pressure when you want enhanced low-frequency impact. Use the built-in microphone for hands-free calls; the speaker will apply echo cancellation automatically.

Recommendations

For best results, keep the speaker firmware updated and avoid exposing charging ports to prolonged water immersion. If using two ULT FIELD 1 units for stereo playback, place them at a modest distance to achieve balanced left and right channels and fuller sound stage.