Sony ULT Field 5

Sony ULT Field 5 (model SRS-ULT50) is a portable Bluetooth speaker from Sony’s ULT POWER SOUND series, released around 2025. It’s designed for bass-heavy playback, outdoor durability, and party vibes, positioning it as a mid-sized option between the smaller ULT Field 3 and larger models.

Key Features and Specs

• Sound: Features a 2-way stereo setup with two tweeters (approx. 46mm) and one X-Balanced woofer (approx. 79mm x 107mm), plus passive radiators for enhanced low-end. The dedicated ULT button offers two modes: ULT1 for deeper bass emphasis and ULT2 for more powerful, punchy overall sound. Supports high-res audio via LDAC codec (plus AAC/SBC), and the Sony | Sound Connect app provides a 10-band EQ, sound field optimization, and custom tuning. Reviews highlight surprisingly strong, immersive bass for its size, clear mids/highs at moderate volumes, and good clarity without much distortion—though some note it shines best at 30-70% volume, with highs occasionally feeling less refined at max.
• Battery Life: Up to 25 hours (varies with volume, ULT mode, and lighting). Quick charge: 10 minutes gives about 2 hours of playtime.
• Durability: IP67 waterproof, dustproof, and rustproof rating—fully submersible (up to 1m for 30 minutes), floats, and handles harsh outdoor conditions like pools, beaches, parks, or dusty areas.
• Party Features: 360° ambient/party lighting that syncs/pulses with music, customizable via app (colors, patterns, flash modes). Includes stereo pairing for multi-speaker setups, party connect mode, and a detachable shoulder strap for easy carrying.
• Connectivity & Extras: Bluetooth, 3.5mm aux input, USB-C charging (can charge other devices in some modes), app control for EQ/lighting/battery care (limits to 90% for longevity).
• Design & Size: Cylindrical “loaf-of-bread” shape, weighs about 3.3 kg (around 7.3 lbs), available in black or off-white. Rugged fabric grille, rubber feet, and protected ports under a flap.

rtings.com

Reviews and Reception

It receives strong praise (often 4–4.5+ stars, e.g., from RTINGS, PCMag, Tech Guide) as a bass-focused portable with great features like LDAC, customizable LEDs, and rugged build—ideal for parties, outdoor gatherings, or bass lovers. Users and testers call it a “bass monster” for its size, with wide soundstage and fun, energetic playback.