The Sony SRS-ULT70 is Sony's flagship ULT FIELD wireless speaker, priced at Rs. 37,900 in Mumbai. It belongs to Sony's ULT POWER SOUND range — a lineup focused on delivering powerful bass in a durable, portable form factor. If you prioritise deep low-end punch over everything else in a portable speaker, the ULT70 is built exactly for you.
Key Specifications
- Driver Configuration: Full-range driver + passive radiators with ULT bass technology
- ULT Button: Hardware button for boosted bass output on demand
- Bluetooth Version: 5.3 with SBC, AAC, and LDAC codec support
- Battery Life: Up to 30 hours at moderate volume
- Charging: USB-C
- Water and Dust Resistance: IP67 — fully dustproof and waterproof
- Weight: Approximately 3.5 kg
- Connectivity: Bluetooth, USB-A playback, 3.5mm AUX
- App Support: Sony Music Center for EQ customisation
- Speaker Add Feature: Link multiple ULT FIELD speakers wirelessly
- Hands-Free: Built-in microphone for calls
The ULT Bass Experience
The defining feature of the SRS-ULT70 is the dedicated ULT button on the unit. Press it once for ULT1 mode — a moderate bass boost that adds warmth and weight without overwhelming the mids. Press it again for ULT2 — a more aggressive bass boost that makes the low end physical and impactful. This hardware-level control is more immediate than navigating app menus, and Sony has tuned each mode well so neither setting sounds muddy or distorted.
For genres where bass is central — hip-hop, EDM, Afrobeats, Bollywood remixes — ULT2 mode transforms the listening experience. For acoustic tracks or classical music, keeping the ULT button off and using the flat EQ setting delivers a cleaner, more natural presentation.
The LDAC codec support is a meaningful differentiator at this price. When paired with an LDAC-capable Android device, the SRS-ULT70 streams at up to 990 kbps — substantially higher fidelity than standard AAC or SBC Bluetooth. On a Sony Walkman or a compatible Android phone, the difference in detail retrieval is audible on well-recorded tracks.
Build Quality and Durability
The SRS-ULT70 is built for rugged use. The outer shell uses a durable mesh and rubberised construction, and the IP67 rating means it handles full submersion — not just splashes. For Mumbai's monsoon conditions, this level of weatherproofing is practical and reassuring.
At 3.5 kg, it is lighter than the XV800 and XV500, making it more portable despite being nearly as loud. The integrated carry strap is comfortable for transport, and the flat base allows stable placement on uneven outdoor surfaces.
Battery Life
30 hours of battery life leads the segment at this price. Even at high volumes with ULT2 mode engaged, expect a real-world runtime of 18 to 22 hours — enough for a full day and evening outdoors. Sony's quick charge feature provides approximately 70 minutes of playback from a 10-minute charge, which is genuinely useful when you forget to charge the night before.
Who Should Buy the Sony SRS-ULT70
The SRS-ULT70 is the right speaker for buyers who prioritise bass performance above all other factors, want LDAC high-resolution Bluetooth audio from a compatible Android device, need IP67 full waterproofing for outdoor use in Mumbai's monsoons, and value 30 hours of battery life for extended use without charging.
If you are choosing between the ULT70 and the XV800 at similar price points, the ULT70 wins on bass depth, LDAC support, battery life, and lighter weight. The XV800 wins on LED party lighting and Party Connect for multi-speaker linking. Choose based on your priority — bass performance or party features.
Where to Buy in Mumbai
The Sony SRS-ULT70 is available at Sony Mony Electronics, an authorised Sony dealer in Mumbai. As an authorised dealer, we offer genuine warranty coverage backed by Sony India's official service network — important for a premium electronics purchase like this.
Visit sonymony.co.in to check current availability and pricing, or visit our Mumbai store for a live demo. We offer no-cost EMI on all major credit cards and bank debit cards, allowing you to take the speaker home today and pay over 3 to 12 months at zero interest.
At Rs. 37,900, the Sony SRS-ULT70 is a competitive offering in the premium portable speaker segment. For bass-focused listeners in Mumbai who want the best Sony portable speaker for music, this is the one to buy in 2026.