Sony SRSULT50B Black – Bass-Driven Power with Portable Freedom

The Sony SRSULT50B Black (ULT Field 5) delivers powerful, boosted audio in a portable design for music fans and party hosts alike. Built for flexibility, this mid-tier Bluetooth speaker merges ULT bass modes, immersive party lighting, and rugged durability. Those seeking bold sound, long battery life, and practical extras like USB-C device charging and multi-speaker pairing will find this model a compelling choice.

Distinctive Features That Set It Apart

Dual ULT bass boost modes distinguish the SRSULT50B: ULT1 produces deep, subwoofer-like lows, while ULT2 provides punchy, energetic sound. Add customizable 360° lighting for a visual edge, and the IP67 rating makes it suitable for the beach, poolside, or dusty settings.

Sound Experience: Engineered for Impact

Inside, Sony equips this model with a dedicated woofer, stereo tweeters, two side passive radiators, and up to 50 W maximum output. Designed for music that's felt as much as heard, the ULT1/ULT2 modes offer club-inspired bass without sacrificing clear treble. High volume performance draws praise for clarity and minimal distortion.

• Speaker Configuration: 2-way active, stereo with left/right tweeters and woofer — For true stereo imaging and impactful bass
• Maximum Output: 50 W — Delivers strong volume and dynamic headroom
• With ULT1 (deep) and ULT2 (punchy) bass modes, you can instantly adapt your listening experience to your mood or music style.

Portability & Battery: Power That Lasts

Weighing approximately 3.3 kg and featuring a detachable, soft shoulder strap, this speaker moves easily between spaces indoors and out. Enjoy up to 25 hours of playback with lights off (10 hours with lights on), stamina mode for 68 hours, and 100 minutes of music after just 10 minutes of charging.

• Battery Life: up to 25 hours — Extended playback for parties and trips
• Quick charge delivers 100 minutes of music after just 10 minutes on the charger
• USB-C Device Charging: Yes — Keeps your phone powered while you listen

Smart Features & Connectivity

Bluetooth 5.3 ensures stable wireless audio with SBC, AAC, and LDAC support. Party Connect enables syncing up to 100 compatible Sony speakers, while app-based light and DJ controls, a 10-band EQ, and dual-device pairing add further versatility. Connect via USB-C, 3.5 mm aux, or wirelessly as needed.

• Wireless Protocol: Bluetooth 5.3 — Reliable connection, dual-device pairing
• Audio Codecs: SBC, AAC, LDAC — High-quality streaming from Android or iOS
• With Party Connect, you can build a massive party soundstage by linking up to 100 compatible speakers for synchronized audio and lighting.

Who Is It For? Mid-Tier Power for Everyday and Events

SRSULT50B is a strong fit for music enthusiasts, party hosts, and anyone looking for immersive sound anywhere. Its blend of impactful bass, tough construction, and dynamic lighting suits modern life—energize a living room, soundtrack a barbecue, or bring music to the beach.