Sony SRS-ULT30 (ULT Field 3)

Sony SRS-ULT30 (ULT Field 3) – Product Overview

The Sony SRS-ULT30, also known as the ULT FIELD 3, is a portable Bluetooth speaker from Sony designed for powerful bass, outdoor durability, and long battery life as part of Sony’s “ULT Power Sound” series.

It is built for people who want a compact but loud speaker with deep bass boost modes.

Sound Performance

The ULT30 focuses heavily on bass-driven audio:

• 1 woofer + 1 tweeter system for clear stereo sound
• ULT POWER SOUND mode for extra deep bass boost
• Custom EQ support via Sony Sound Connect app
• Strong volume output for its size
• Balanced mids and highs, but bass is the main focus

Overall sound signature: powerful, bass-heavy, and party-oriented.

Bass & Sound Modes

• ULT button (bass boost mode)
• Standard listening mode (balanced sound)
• Sound field optimization (auto tuning)
• Party Connect support for linking multiple Sony speakers

Battery Life

• Up to ~24 hours playback on a full charge
• USB-C charging
• Power bank function (can charge phone)
• Efficient power use even at higher volumes

Durability & Design

• IP66 / IP67 water & dust resistant (very rugged)
• Portable cylindrical design with strap
• Built for outdoor use (beach, pool, travel)
• Weight around 1.2 kg

Connectivity & Features

• Bluetooth 5.2
• Party Connect (multi-speaker sync)
• Hands-free calling
• USB-C input/output
• Works with Sony Sound Connect app

Strengths vs Weaknesses

Strengths:

• Very strong bass (ULT boost mode)
• Excellent battery life (24h)
• Fully waterproof and dustproof
• Loud for its compact size
• Can charge your phone

Weaknesses:

• Bass can overpower mids at high volume
• Not as detailed as audiophile speakers
• Heavy compared to ultra-portables
• Best experience mainly in bass-heavy music