Sony Ult Field 1

The Sony ULT FIELD 1 (SRS-ULT10) is the most compact portable Bluetooth 5.3 speaker in Sony's ULT POWER SOUND series, replacing the SRS-XE200 and SRS-XB23 tier with a true 2-way acoustic layout (83 × 42 mm woofer + 16 mm tweeter), dual side-firing passive radiators, a physical ULT bass boost button, and an IP67 waterproof, dustproof, saltwater-rustproof, and MIL-STD-810H shockproof chassis weighing 650 grams.

2-way woofer and tweeter architecture with ULT POWER SOUND

Whereas many compact cylindrical Bluetooth speakers rely on full-range drivers alone, the ULT FIELD 1 separates frequencies across a dedicated 83 × 42 mm racetrack mid-bass woofer and a discrete 16 mm high-frequency dome tweeter, flanked on both ends by side-mounted passive radiators. Pressing the backlit ULT hardware button on the top control strip activates ULT POWER SOUND, deepening low-frequency extension and boosting overall sound pressure for open-air listening, while Sony's Sound Diffusion Processor spreads audio across the space. When paired with the Sony Music Center app, listeners can also switch ULT mode off and dial in a custom 3-band equalizer (Bass, Mid, Treble), or link two ULT FIELD 1 speakers wirelessly via Stereo Pair for dedicated left/right stereo imaging.

IP67 waterproof/dustproof/rustproof and MIL-STD-810H shockproof build

Engineered for beaches, trekking, and monsoon travel, the 206 × 77 × 76 mm fabric-wrapped housing carries a full IP67 rating (dust-tight and immersible in up to 1 meter of water for 30 minutes when the rear USB-C flap is closed) plus saltwater rustproof treatment. In addition, the rubberized end bumpers and internal chassis have passed MIL-STD-810H Method 516.8 Shock testing, surviving drops from 1.22 meters onto 5 cm thick plywood. The speaker is balanced to sit horizontally on a table, stand vertically in tight counter spaces, or hang from a backpack, tree branch, or shower rail via its detachable multi-way woven carry strap.

12-hour battery, USB-C charging, and Echo Cancelling speakerphone

The internal lithium-ion battery delivers up to 12 hours of continuous wireless playback and recharges via USB Type-C (5V 1.5A DC). Wireless connectivity uses Bluetooth 5.3 (SBC and AAC codecs; A2DP, AVRCP, HFP, HSP, and SPP profiles) with Google Fast Pair support on Android devices. For hands-free phone calls and video meetings, a built-in omnidirectional microphone with Echo Cancelling prevents feedback and allows natural two-way conversation.

Bangladesh buyer checklist

Before ordering the Sony ULT FIELD 1 (SRS-ULT10) from any seller in the BiponiBD catalog, confirm the exact color variant (Black, Off-White, Forest Gray, or Orange), verify that the USB Type-C charging cable and detachable multi-way strap are sealed inside the box, and check seller warranty terms.

Official references: Sony Official ULT FIELD 1 (SRS-ULT10) Wireless Speaker Specifications.