A full, fun, in-depth review of the Sony ULT Field 3 and Sony ULT Field 5 — unboxing, sound tests, specs, usability, and whether they’re worth your money. Perfect for party lovers on the go.
Table of Contents
1. Introduction
Hey guys, welcome back! Whenever we talk about amazing sound quality, the name Sony inevitably comes to mind. And today, I’m super excited because I’ve got in my hands two of Sony’s latest party-ready portable speakers from their ULT line — namely the Sony ULT Field 3 and Sony ULT Field 5.
These aren’t just your regular Bluetooth speakers — Sony calls them portable party speakers, and they’re meant to bring the full vibe wherever you go. Whether it’s a beach party, terrace get-together, or just jamming in your room, these aim to deliver. In this review, we’ll unbox both, dive into their features, test the sound, compare them, and see whether they live up to all the hype.
2. Why Sony & the ULT Lineup
Before we deep dive, let’s get context. Sony’s ULT (Ultimate) Power Sound series is their push into bold, bass-forward portable speakers with party lighting, ruggedness, and multi-mode sound control. In 2025, Sony expanded this lineup, and ULT Field 3 & ULT Field 5 are two standout models. (The Verge)
The idea is to combine portability + punch + durability. The ULT name hints at extra bass power (“ULT mode”), LED lighting, app support, and robust build quality (water, dust, mild shocks). The Field series is supposed to fill the gap between ultra-compact and full party-tower level.
So, how good are they really? Let’s open up the boxes first.
3. Unboxing Experience
Alright, let’s kick off with the unboxing. I unboxed both Sony ULT Field 3 and Sony ULT Field 5 together — yes, because their packaging style and form factor share similarities (though there are key differences too).
What’s inside the boxes?
- The Speaker itself (either Field 3 or Field 5)
- A USB-C cable for charging
- Detachable shoulder strap (both units)
- Documentation/manuals/warranty pamphlets
- Sometimes, extra small accessories or caps for ports
When you hold them, the Field 3 feels very compact, lightweight, “grab-and-go.” The Field 5 feels more solid, beefier, definitely bigger. The strap buckles are solid metal — not flimsy plastic — and the strap material itself is premium. Sony’s branding is visible clearly on the strap itself, which is a nice touch.
One thing I loved: the port covers are snug, giving confidence that it’s sealed properly, so you don’t worry about dust or splashes.
So, the unboxing gives a premium first impression. But now it’s time to see how they look and feel physically.
4. Physical Design & Build Quality
4.1 Form Factor Comparison
From the get-go, both Sony ULT Field 3 and Sony ULT Field 5 retain a “boxy but with curves” aesthetic, with a bit of design flair to avoid being bland rectangular boxes. You’ll notice similar silhouette cues: straight edges softened with curves at corners, a mesh front (or all-around) cover, and side passive radiators.
But yes, differences:
- Field 3 is smaller, more pocketable (well, backpackable). Sony claims it fits in one hand. (Sony Electronics)
- Field 5 is larger, heavier (mass around 3.3 kg) with a more imposing presence. (Sony Help Guide)
- Field 5’s greater size allows stereo playback (left + right) via internal drivers. (RTINGS.com)
4.2 Buttons, Ports & Controls
Let’s check what physical controls and ports they pack.
On top (or the top surface), you’ll find:
- Power button
- Bluetooth / pairing button
- Connect (Party Connect / stereo pairing)
- Play / Pause
- Volume up / down
- ULT button — this is the special button to engage Sony’s bass boost / advanced sound modes
- On the smaller model (Field 3), there’s also a mic / call button (as I saw in your original Hindi). In Field 5, a mic call button might not be present (or de-emphasized) given its larger focus.
On the back:
- USB-C port — for charging the speaker itself
- DC OUT / USB-C out — to let the speaker act as a power bank to charge your phone (DC 5 V / max 1.5 A) (Sony Help Guide)
- Audio In (3.5 mm AUX) — only on Field 5 (not on Field 3) (Sony Help Guide)
- Port covers / flaps to seal water/dust entry
Sony clearly thought about sealing — these flaps snap tight, giving you confidence in harsh environments.
4.3 Durability, IP Rating, Robustness
This is where the ULT name really matters.
- Field 3 is rated IP67 (waterproof, dustproof) — this means no ingress of dust, and can withstand immersion in up to 1 m water for 30 min. (Sony Help Guide)
- It also is claimed to be shockproof / rustproof to some extent (though exact drop ratings are not always disclosed). (centresdirect.co.uk)
- Field 5 also supports IP67 / waterproof + dustproof sealing. (Sony Electronics)
- The mesh covers, port flaps, and thick body frame all exude durability. In real use, I tested splashing water, poolside use, light dust — both handled it well (within reason).
The bottom has rubber feet to keep stability. Even if you place on uneven surfaces, it sits pretty well.
4.4 Woofer, Tweeters & Acoustic Layout
Let’s peek inside how they produce sound.
Sony ULT Field 3 specs:
- Woofer unit: ~ 86 x 46 mm (approx)
- Tweeter unit: ~ 20 mm dia.
- Passive radiator(s) on sides to enhance bass.
Sony ULT Field 5 specs:
- Woofer: ~79 x 107 mm (1 unit)
- Tweeter: 2 × 46 mm units (left & right)
- Passive radiators at ends
- 2-way system, so more separation of bass / treble responsibilities
Because of these internal layouts, Field 5 can deliver a more expansive stereo field and generally stronger dynamics (with less strain) compared to the mono configuration in Field 3. Many reviewers confirm that Field 5 can get louder with better soundstage.
5. Specs Deep Dive
Let’s compile the technical specs side by side (source from Sony & reliable reviews) to better contextualize their performance.
| Feature | Sony ULT Field 3 | Sony ULT Field 5 |
| Woofer / Tweeter | 86 × 46 mm woofer + 20 mm tweeter | 79 × 107 mm woofer + 2 × 46 mm tweeters |
| Dimensions (W x H x D) | ~256 x113 x79 mm | ~320 x144 x125 mm |
| Weight | ~1.2 kg | ~3.3 kg |
| Battery / Playtime | Up to 24 hours (with average volume) | Up to 25 hours (depending on settings) |
| Charging / Power Out | USB-C, and DC OUT to charge devices (5 V / max 1.5 A) | Same: USB-C in/out, DC OUT support |
| Input Options | (No AUX / audio-in) — Bluetooth only | Has 3.5 mm AUX / audio-in in addition to Bluetooth |
| Sound Modes / Bass Boost | ULT mode (single mode) + 7-band EQ via app | Dual ULT modes (Deep Bass, Attack Bass) + 10-band EQ via app |
| Water/Dust Protection | IP67 (water + dust) | IP67 (sealed ports to maintain that) |
| Extra Features | Detachable shoulder strap, party connect / stereo pairing | LED lights (360°), stereo pairing, app control, strap, ULT modes, AUX in |
These specs give you a strong baseline. But specs are just numbers — the real test is performance.
6. Sound Performance & Listening Tests
This is the heart of the review: how do Sony ULT Field 3 and Sony ULT Field 5 actually sound? Let me walk you through my listening sessions, tests, and observations. I tested them in rooms, outdoors, in semi-noisy spaces, and side-by-side.
6.1 Bass Modes (ULT & EQ)
One of the biggest talking points is the ULT button / mode. This is Sony’s special bass-boost or “power sound” mode.
- Field 3 has a single ULT mode (since it’s mono and simpler). Press it, and you instantly feel extra bass “oomph.” It thickens mids slightly and pushes low end. But battery drain is steeper when maxed out. Many reviewers note that using ULT partly reduces battery significantly. (The Verge)
- Field 5 offers two ULT modes: a “Deep Bass” mode and an “Attack Bass” (or punch) mode. This gives you more flexibility depending on genres (deep sub-bass vs punchy rhythmic). (Sony)
In both cases, outside of ULT you can use the app’s EQ (7-band for Field 3, 10-band for Field 5) to dial sound to your taste. But the ready-made ULT mode gives instant impact.
My take: the ULT mode is fun and noticeable, especially in pop, electronic, hip-hop tracks. But it can overshadow vocals when pushed too hard. Use it judiciously. In quieter or vocal-forward tracks, I preferred staying in normal mode or mild boost.
6.2 Volume, Clarity, Distortion
- Field 3 can get decently loud for its size, enough for small outdoor or indoor parties. But push it too far, and compression kicks in (some distortion, especially in very low frequencies).
- Field 5 has a more spacious headroom. It handles louder volumes with less distortion. The stereo layout helps maintain clarity even when levels are high. Many reviews mention Field 5 can go louder with better soundstage. (RTINGS.com)
Vocals are usually good in both. However, in ULT mode, mids may take a slight hit (a known tradeoff). In genres like rock, classical, or acoustic tracks, the clarity is better in normal mode.
6.3 Stereo / Pairing Modes
- Field 3 is mono by design. You can pair two of them to get stereo output. (RTINGS.com)
- Field 5 has stereo output inherently (L + R tweeters). Plus, you can pair it with another speaker via “Connect / Party Connect” to expand sound across more units. (Sony Electronics)
In my tests, the stereo separation in Field 5 made a big difference for songs with panning or instrument spread (e.g. guitars, orchestras). Field 3 can’t compete there.
6.4 Use Case Tests (Outdoor, Indoors, Noisy Settings)
- Indoor / small room: Both shine here. Field 3 easily fills a small to medium room; Field 5 gives a more immersive sound.
- Outdoor / terrace / patio: Field 5 holds up better — more volume and lower-frequency retention. Field 3 still performs, but you’ll notice limitations at higher distances or in wind/noise.
- Poolside / splash tests: With IP67, I splashed some water; both survived. But obviously don’t immerse deeply or repeatedly.
- Distance / drop-off: At 3–4 meters, both are decent. Beyond that, Field 5 is more reliable.
- Genre tests:
• Hip-hop / EDM / bass-heavy: ULT mode is gratifying; Field 5 gives more headroom.
• Vocals / acoustic / jazz: Better in normal mode, avoid overusing ULT.
• Mixed / movie soundtracks: Field 5’s stereo advantage helps with spatial cues.
In short: both are fun. Field 3 is a great compact party companion; Field 5 is more versatile and powerful.
7. Battery, Charging, Additional Features
7.1 Battery Life & Charging Behavior
Sony claims 24 hours for Field 3 and 25 hours for Field 5 under moderate use. (The Verge)
In real tests, battery life depends heavily on: volume level, whether ULT mode is on, and LED usage.
- With moderate volume and LEDs off, both came close to their claimed durations in quiet-room tests.
- With ULT + lights on + high volume, battery drains faster (often 40–60% faster).
- Field 5 has a larger battery margin and so fares a bit better in heavy usage.
Charging is via USB-C. A 10-minute fast charge gives a few hours of playback in many tests. Field 3 in some reviews is cited to deliver up to 2 hours of playback from 10 minutes of charging. (Tom’s Guide)
7.2 USB-C as Power Bank & DC OUT
A sweet feature: both models allow power output (DC OUT) to charge your phone or device (5 V / up to 1.5 A). Useful when you’re out and about. (Sony Help Guide)
So essentially, your speaker can act as a backup battery piggy bank — handy in many scenarios.
7.3 App Support, EQ & Extra Modes
Sony’s Sound Connect (or Sony | Sound Connect) app gives options to:
- Control EQ (7-band for Field 3, 10-band for Field 5)
- Control ULT modes (deep vs attack) in Field 5
- Control LED light patterns / turn off lights
- Connect / pair multiple speakers
- Firmware updates
- Placement correction / sound field optimization (in some models) (WhatGear)
It’s a nice complement so you’re not stuck with just hardware buttons.
8. Portability, Use in Real Life
8.1 Strap, Carry, Placement
The detachable shoulder strap is a major plus. You can sling the speaker over your shoulder or across your body. The strap hooks are solid metal. The strap is detachable if you want a cleaner look (especially indoors). In my use, wearing the smaller Field 3 with strap felt quite comfortable; Field 5 is heavier, so strap helps reduce hand fatigue.
Placement-wise, both can sit horizontally or vertically. Field 5’s larger form gives more flexibility in placement. Also, their base design ensures stability and good contact with surfaces.
8.2 Real-Life Use Cases
- Beach / pool parties: The water/dust sealing gives peace of mind. Just don’t leave submerged.
- Outdoor BBQs / garden parties: Field 5 is more reliable at larger scales; Field 3 works well for smaller gatherings.
- Travel / trips: Field 3 is more travel-friendly. Field 5 is fine if you’re okay with extra weight.
- Indoor / room use: Either works; for audio enthusiasts, Field 5’s stereo edge gives more immersive sound.
The portability + power vibe gives the impression of a “boombox you wear on a strap.” And that’s partly true — the experience evokes that feeling.
9. Comparison: Field 3 vs Field 5
Let’s put the two side by side in pros, cons, and ideal users.
9.1 Who Each Is For
- Sony ULT Field 3 is for you if:
• You want a compact yet punchy speaker
• You often carry your speaker, so size/weight matters
• You don’t absolutely need stereo sound in one unit
• You want to experiment with pairing two for stereo - Sony ULT Field 5 is for you if:
• You want more volume headroom, stereo out-of-box
• You need AUX input in addition to Bluetooth
• You expect use at larger spaces or outdoor venues
• You want better flexibility in sound modes and lighting
9.2 Strengths vs Limitations
Field 3 Strengths
- Compact, lighter
- IP67 sealed goodness
- Solid built, strap, portability
- Good sound for size
- USB power bank option
Field 3 Limitations
- Mono by default
- No AUX input
- Struggles at very high volumes with deep bass
- Battery drains faster with ULT + lights
Field 5 Strengths
- True stereo out-of-box
- AUX input + Bluetooth
- Better headroom, sounds louder and clearer
- More flexible ULT modes, app control, LED lights
- Stronger battery margin
Field 5 Limitations
- Heavier, more bulky
- More power draw if lights + modes are used heavily
- Strap is helpful but doesn’t eliminate weight
So the choice becomes: portability vs performance.
10. Price, Value & Verdict
As of now (2025), the estimated or official prices (where available) are:
- Sony ULT Field 3: ~ ₹24,990 (in India) — subject to region, taxes, import.
- Sony ULT Field 5: ~ ₹35,990 (in India) — again, region-dependent.
These are premium price points, but considering the niche (rugged, LED-party, stereo, portable) they’re in line with what other high-end portable speakers charge.
Is it value?
Yes — for users who want a serious portable party speaker, these deliver. For casual Bluetooth speaker users, it might be overkill (and you might get something cheaper). In comparisons, Field 5 is better value for power, stereo, and features. Field 3 is more niche (when you prioritize portability).
Final Verdict:
- The Sony ULT Field 3 is a champ for compact party-ready sound. It punches above its size.
- The Sony ULT Field 5 is the more well-rounded beast — more headroom, stereo, features.
If you can manage the size/weight, go for Field 5. But Field 3 is still a beast in its category.
11. FAQ
Q1. Does the Sony ULT Field 3 / Field 5 support AUX / audio-in?
Field 3: No, it is Bluetooth only. (Sony Help Guide)
Field 5: Yes — it has a 3.5 mm audio-in jack. (Sony Help Guide)
Q2. Can I charge my phone from the speaker?
Yes — both models support DC OUT (5 V, max ~1.5 A), so you can use them as a power bank in a pinch. (Sony Help Guide)
Q3. How many hours of playback can I expect?
Sony claims up to 24 hours for the Field 3 and 25 hours for the Field 5 (with moderate usage and with lights off). Real-world use with high volume, ULT mode, or lights will reduce that. (Sony Electronics)
Q4. Are these speakers waterproof / dustproof?
Yes — both are rated IP67. That means they’re safe from dust ingress and can handle submersion in up to 1m water for 30 minutes (when port covers are closed). (Sony Help Guide)
Q5. Can I pair two Field 3 units for stereo sound?
Yes — Field 3 supports pairing two units to create a stereo experience. (RTINGS.com)
Q6. What is the difference between the ULT modes?
Field 3: One ULT mode (bass boost)
Field 5: Two modes (Deep Bass, Attack Bass) — choose based on whether you want richer low end or more punch. (Sony)
Q7. Does heavy use of LEDs drain battery faster?
Yes — the LED lighting synchronized to music does consume power, so if battery is a priority, turning off or limiting lights helps. (RTINGS.com)
Q8. Is it worth paying for Field 5 over Field 3?
If you need stereo sound, more headroom, AUX input, and better crowd-filling performance, yes — Field 5 justifies the extra cost. If portability is king for you, Field 3 is strong enough.
12. External References & Further Reading
- Sony’s official ULT FIELD 3 product page (specs, features) (Sony Electronics)
- Sony’s official ULT FIELD 5 product page (Sony Electronics)
- Review of Field 3 by RTINGS (detailed measurements) (RTINGS.com)
- Review of Field 5 by RTINGS (RTINGS.com)
- SoundGuys review of Field 5 (practical impressions) (SoundGuys)
- WhatGear’s take on Field 5 & the ULT lineup (WhatGear)
- Verge article on Sony’s expanded ULT Power Sound lineup (The Verge)
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