Overview

The Sony ULT Field 1 is a rugged, go-anywhere Bluetooth speaker engineered with a single goal: delivering massive bass in a compact package. As the entry point to Sony's ULT Power Sound series, it features a 2-way driver system—a high-output rectangular woofer and a dedicated tweeter—complemented by dual passive radiators on each side. This configuration provides significantly more low-end weight than traditional ultra-compact speakers, while the dedicated ULT button on the chassis allows you to push that bass even further without ever opening an app.

Simcoe Audio Video Insight

The ULT Field 1 is built for real-world adventure. While many speakers claim to be "tough," Sony has pushed the Field 1 through rigorous shock testing and added specialized rustproofing to its IP67 rating. This makes it one of the few portables we recommend for coastal use or salt-air environments where standard outdoor speakers often fail. It’s a "performance-first" portable that prioritizes a fun, energetic sound signature that doesn't get lost in open outdoor spaces.

Best for the Sony ULT Field 1: keep the ULT mode engaged when listening outdoors or in large rooms. While turning it off provides a leaner, "flatter" response for quiet indoor listening, the ULT mode is specifically tuned to round out the speaker's character, providing the necessary muscle to compete with wind and ambient background noise.

More Details

Why It Wins

• On-Demand Bass: The physical ULT button provides an instant boost to low-end frequencies, making it easy to adjust the vibe on the fly.
• Extreme Durability: Beyond being waterproof and dustproof, it is officially shockproof and rustproof, designed to survive drops and harsh environments.
• 2-Way Sound: Unlike most single-driver competitors, the dedicated tweeter ensures that high-frequency details remain crisp and clear even when the bass is cranked.

What Makes It Different

The Field 1 stands out for its clever "Usability First" design. The multi-way strap is detachable and can be used to hang the speaker from a backpack, a tree branch, or a patio umbrella. It also features Echo Cancelling technology for its built-in microphone, allowing for surprisingly clear hands-free calls—a feature often skipped by competitors like the JBL Flip series. Its rectangular woofer design maximizes diaphragm area compared to traditional circular drivers, resulting in higher sound pressure and less distortion.

Technical Highlights

• 12-Hour Battery Life: Provides a full day of casual listening (measured at volume level 25 with ULT on); note that max volume playback with ULT engaged will reduce runtime to approximately 3 hours.
• Modern Connectivity: Bluetooth 5.3 with Google Fast Pair for near-instant connection to Android devices.
• Stereo Pairing: Wirelessly link two ULT Field 1 speakers to create a wider, more immersive stereo soundstage.
• Sony Music Center Support: Use the app to access a 3-band equalizer and customize your sound profile.

Buyers Guide

Who This Is For

• The Active Adventurer: Hikers, campers, and beach-goers who need a speaker that can genuinely take a beating and keep playing.
• The Bass Enthusiast: Listeners who want an energetic, punchy sound without having to navigate EQ menus in an app.
• The Value Hunter: Anyone looking for a rugged step-up from ultra-portable "clip" speakers who isn't ready to jump to flagship pricing.

Ideal Use Case

• Beach and Coastal Trips: The rustproof coating ensures the speaker survives salt air and sand better than standard portables.
• The Home Workshop: Tough enough to handle dust and occasional drops while providing enough volume to be heard over tools.
• Backpack Carry: The lightweight 650g frame and multi-way strap make it an effortless addition to any day bag.

What To Pair It With

• Expansion: Purchase a second ULT Field 1 to unlock the Stereo Pair function for a dedicated Left/Right audio experience.
• Charging: Use a 3.0A or 1.5A USB-C wall adapter to ensure the fastest possible recharge times.
• Software: Download the Sony Sound Connect app (formerly Music Center) to manage firmware updates and fine-tune the 3-band EQ.

Alternative Options

The ULT Field 1 is optimized for bass and durability. If you prioritize absolute maximum volume and a wider soundstage with USB-C audio input, the JBL Flip 7 is a worthy step up. If you need a speaker that can double as a power bank for your phone or you need to fill a much larger party space, we recommend moving up to the Sony ULT Field 7. For those who want the longest possible battery life in a tiny form factor, the Sony SRS-XB100 offers up to 16 hours of runtime.