Sony ULT Field 5 Wireless Portable Bluetooth Speaker, IP67 Waterproof, Dustproof, and Rustproof with Enhanced Bass, 25 Hour Battery, 360° Party Light, and Shoulder Strap (SRSULT50B), Black
Condition: Used - Like New
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Availability:
In Stock.
Arrives
Thursday, May 14
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Style: ULT Field 5
Color: Black
Features
- BEST MIDRANGE BLUETOOTH SPEAKER: CNET Best of 2025. If you dont take our word for it, trust the experts.
- ULT BUTTON: Press to boost the bass for a deeper, richer sound.
- SHOULDER STRAP: Designed for easy portability, making it simple to carry your speaker wherever you go.
- PARTY CONNECT BUTTON: Link multiple speakers together to create an immersive sound experience across larger areas.
- IP67 WATERPROOF AND DUSTPROOF: Built to withstand harsh conditions with rugged durability for ultimate protection.
- UP TO 25 HOURS OF BATTERY LIFE WITH QUICK CHARGING: Enjoy long-lasting playtime with a battery that can keep up with your music sessions. A 10-minute charge gives you up to 2 hrs of playtime, perfect for when you're in a rush.
- 10-BAND EQUALIZER: Customize your audio experience with the 10-band EQ, allowing you to fine-tune sound for optimal clarity, depth, and balance.
- AMBIENT LIGHTING: The light perfectly matches the vibe of your music, enhancing the atmosphere with vibrant colors.
- ENHANCED POWER & SOUND PRESSURE: Delivers powerful, immersive bass and sound pressure for a premium audio experience.
- 2-WAY ACTIVE DESIGN: Features a dedicated woofer and tweeter for high-quality sound across all frequencies.
Description
Experience superior sound with powerful boosted audio, deep bass, and vibrant 360° Party Lights. Designed for portability, this speaker is easy to carry, so your music and party vibes can go wherever you do. Perfect for any setting, it delivers immersive sound and lighting to elevate every moment.
Brand: Sony
Frequency Response: 2.4 GHz
Connectivity Technology: Bluetooth
Audio Output Mode: Stereo
Input Voltage: 9 Volts
Audio Output Mode: Stereo
Mounting Type: Free standing
Enclosure Material: Plastic, Mesh fabric
Speaker Type: Portable Speaker
Additional Features: Bass Boost, Built In Microphone, Dustproof, LED Light, Lightweight, Portable, USB Port, Waterproof
Antenna Location: For Music Players, For Smartphones or Tablets
Color: Black
Is Waterproof: True
Warranty Type: Limited
Maximum Range: 5 Meters
Control Method: Touch
Speaker Size: 46 Millimeters
Water Resistance Level: Water Resistant
EU Spare Part Availability Duration: 7 Years
Bluetooth Range: 30 Meters
Specific Uses For Product: Party, Travel
Battery Average Life: 25 Hours
Total USB 2.0 Ports: 1
Connectivity Technology: Bluetooth
Wireless Technology: Bluetooth
Connectivity Protocol: Bluetooth
Power Source: Battery Powered
Number of Batteries: 1 9V batteries required.
Audio Driver Type: Dynamic Driver
Brand: Sony
Model Number: SRSULT50B.UC
Model Name: ULT FIELD 5
Built-In Media: Speaker, Strap belt, USB Type-C® Cable
Warranty Description: 1 year
Number of Items: 1
UPC: 027242931947
Manufacturer: Sony
Input Voltage: 9 Volts
Frequency Response: 2.4 GHz
Number of Audio Channels: 2.0
Unit Count: 1.0 Count
Item Dimensions D x W x H: 5"D x 12.6"W x 5.7"H
Item Weight: 7.31 Pounds
Compatible Devices: MP3 Player, Smartphone
Battery Charge Time: 10 minutes
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Thursday, May 14
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Similar Products
Top Amazon Reviews
Style: ULT Field 5
Color: Black
I was pleasantly surprised by this speaker. The sound quality is real good for a portable speaker. I’m going to consider it portable because it has a well thought out strap and you can take it places with you. It is kind of heavy and large, but the dimensions are in the product description so nothing that I didn’t already know. The build quality of this speaker is top notch. When you hold it in your hand you feel like you got something for your money. The materials look and feel good, and the bass speakers in the end are well protected and punchy. I use this on a sailboat, pontoon boat, camping trips, and in the backyard. It just works and sounds great everywhere. I have gotten it wet and used it in very dusty environments with no issues. As far as sound goes, I’m not sure you could beat it with a speaker the same size or price. It is crisp and bass sounds good. At 100% volume it gets a little out of control but that is almost every speaker on the market. The battery life is all day with no issues. It has never died and I have used it for 10+ hours straight.
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Reviewed in the United States on March 29, 2026 by Amazon Customer
Style: ULT Field 5
Color: Black
This is a super amazing portable, mid-range bluetooth speaker. It sounds crisp and offers features such as the ULT sound boosting software, water resistance, while also boasting 68H of use using Stamina mode, which turns off ULT modes, EQ effects, and lighting to maximize longevity. Definitely give this speaker a try at your next gathering in a public park or patio with your friends and family -end. Overall a well-rounded speaker for the price range.
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Reviewed in the United States on April 16, 2026 by Brayak A.
Style: ULT Field 5
Color: Black
This is an amazing speaker, truly top notch in sound and build quality. It feels heavy, connects quickly as most SONY products do, there's no detail forgotten when it comes to features, yet its simplistic enough to not be overwhelming with options, and the straps to carry around the speaker are not an after thought. All around, a solid speaker that I feel is worth the price I paid (at the time $198, maybe not $350 but definitely $198) With that being said, it is NOT portable, at least for me. It gets heavy pretty quickly if you lug it around, even with the crossbody strap. If you're ok with being unable to grab the speaker and shove it into a bag or suitcase then I would opt for the smaller options for sure. If you frequent outdoor events enough to want a speaker of this physical caliber, or plan on using it as TV sound bar or static speaker system, then I would highly recommend. Over all, solid speaker, emphasis on the SOLID part of the speaker, it feels high quality and over engineered for heavy duty adventure and performance, it is just a big ass speaker that I personally wasn't ready for. I will unfortunately and begrudgingly have to return it, but if I could keep it I would.
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Reviewed in the United States on July 9, 2025 by Abby
Style: ULT Field 5
Color: Black
The media could not be loaded. I wanted powerful sound that was also portable. "Partyboxes" are too big for portability, so it was between the JBL Xtreme 4 and the Sony ULT Field 5 and I can confidently say Sony come out way in front. The sound this speaker produces is very good, especially using ULT 2 preset, providing clear highs with great mids and bass. The problem I have always had with Bluetooth speakers is they all sound muffled, but this one does not have that problem. To add to that, the lighting is a surprise hit! It really responds well to the music that is playing, but isn't too bright and distracting. Really like when it strobes when the music is really hitting hard. The build quality is solid and premium feeling. The added strap is a nice addition, and it integrates into the speaker very well and doesn't feel like an afterthought once you attach the straps and seat the rubber connectors back into the unit, giving it a clean look. I was also really happy to se an aux in on the back, so I can connect it to a record player.
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Reviewed in the United States on July 2, 2025 by Schuyler R.
Style: ULT Field 5
Color: Black
Review – Sony ULT Field 5 (2 Months of Use) First Impressions & Context For its price and size, the sound performance (power and overall quality) is above what I initially expected. However, it weighs close to 8 pounds. Carrying it short distances is fine, but for longer walks or if you’re already carrying other items, the weight becomes noticeable. My first impression was actually underwhelming, but that was influenced by context. I tested it in the same small room where I use a 5.1 home theater system (Sony STR-K5 750W 5.1 Home Theater System with a large subwoofer). I am used to that level of low-end presence in a confined space, so my expectations were biased. Real-World Use Case My goal was simple: energize a 10–15 m² indoor space with around 6 people. For that purpose, it performs well. Indoors, once you push it past 50% volume, it feels powerful and engaging. Below 30–40%, it does not feel particularly strong. It needs some volume to “wake up.” Outdoors is a different story. Sound disperses quickly without walls to reflect it, and the perceived impact drops significantly. While it still works for a table or small group setup, it does not project that “wow” presence from a distance. At around 20 meters, you won’t feel much presence. If your goal is to impress people in an open area, this may fall short. Sound Performance ULT Mode: I mostly use ULT 2 because it delivers the extra punch I was looking for. ULT 1 feels more controlled, but ULT 2 brings the energy. Bass: For its size and price, bass performance is strong—especially in ULT 2. In small rooms, it can be surprisingly impactful. In open spaces up to around 10 meters, it still performs decently, but beyond that, the impact fades. Highs: Sony has improved here. Highs and lows blend well, and the sound does not feel muddy or overly bass-heavy. The tuning is balanced, though there is still room for refinement at higher volumes. I have not pushed it to 100% volume yet, but based on other user feedback, distortion seems well controlled. Battery Battery life meets expectations. I use the 90% charge protection feature and typically listen around 60% volume. With that setup, it easily lasts through a full day outing. No complaints here. Portability & Build Build quality feels solid and premium. The weight suggests there is serious hardware inside. Materials and assembly feel compact and well put together. That said, portability is relative. The shoulder strap helps, but at nearly 8 pounds, it’s not something you casually carry long distances without noticing. App & Connectivity The Sony app is simple, clean, and functional. It does what it needs to do without unnecessary complexity. Pairing was slightly confusing at first. I initially paired it under a Google account with multiple devices, and later had trouble connecting a different device. I ended up doing a factory reset, which solved the issue. This may have been user error rather than a speaker problem. Latency has not been noticeable when watching videos, so synchronization seems solid. Lights In a dark room, the 360° party lights do add some atmosphere and can enhance the overall experience. They are not overly aggressive and complement the music nicely. That said, I personally do not use them often, mainly to preserve battery life. They are a nice feature to have, but not essential for my typical use. Amazon Delivery & Packaging The delivery experience was excellent. The unit arrived in perfect condition, very well packaged, with no dents or visible damage to the box. Everything was intact and properly protected. Overall, the shipping and handling were exactly what you would expect from Amazon—smooth and reliable. Final Thoughts I chose this over the JBL Xtreme 4, and for my specific indoor use case, it has been a good choice. However, if your main goal is strong outdoor projection and noticeable presence at a distance, you may want to consider something larger. Indoors, it performs confidently. Outdoors, it becomes more modest—more of a “table speaker” than a crowd-puller. Overall, I would describe my experience as positive but situational. It delivers strong performance for its size, but expectations need to match realistic acoustic limitations.
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Reviewed in the United States on February 13, 2026 by Freddy Cruz