Sony ULT Field 5

Name: Sony ULT Field 5
Brand: Sony
SKU: 6738

Manufacturer: Sony

The Sony ULT Field 5 is a large-format portable speaker built for extended outdoor use, combining solid weather protection with a broad feature set. Weighing 3,300 g and measuring 320 mm wide, it is clearly designed for stationary setups rather than on-the-go carrying. One of its more practical additions is that it functions as a power bank, allowing users to charge external devices directly from the speaker. RGB lighting and a control panel mounted on the unit round out the physical feature set.

On the connectivity side, the ULT Field 5 runs Bluetooth 5.3 with a maximum wireless range of 10 m and supports LDAC for higher-quality audio transmission. An AUX input provides a wired alternative, and a USB Type-C port handles charging duties. The speaker carries an IP66 rating, meaning it is protected against dust ingress and strong water jets. Battery life is rated at 25 hours, with a built-in indicator to track remaining charge. It also supports stereo pairing with a compatible second unit and includes a sleep timer among its onboard features.

Pros

IP66 rating provides full dust protection and resistance to strong water jets, making it suitable for outdoor use in demanding conditions
25-hour battery life allows for extended use between charges, with an indicator to monitor remaining power
Doubles as a power bank, enabling users to charge other devices directly from the speaker
LDAC support enables higher-quality audio transmission over Bluetooth compared to standard codecs
Stereo pairing lets two units be linked for a dedicated two-channel stereo setup
AUX input offers a wired audio source alternative when Bluetooth is not preferred

Cons

Bluetooth range is limited to 10 m, which may restrict placement flexibility in larger spaces
At 3,300 g, the unit is quite heavy, making it less practical to carry frequently or over long distances
No wireless charging support means the speaker must always be tethered for recharging
No travel bag is included despite the unit's size, leaving users to source their own carrying solution
Fast pairing is not available, which can slow down the initial connection process
No 3.5 mm headphone jack socket, limiting direct wired connection options to AUX input only

Who is this for?

This speaker is well-suited to users who prioritize outdoor durability, given its IP66 rating that handles dust and strong water jets without issue. With a 25-hour battery life and the ability to function as a power bank, it works well for all-day outdoor gatherings, camping trips, or events where access to power is limited. Users who want higher-quality wireless audio transmission will also appreciate the inclusion of LDAC, and those with a second compatible unit can take advantage of stereo pairing for a wider soundstage.

Who is this NOT for?

At 3,300 g and with no included travel bag, this speaker is poorly suited to users who need something easy to carry on the move, such as hikers or commuters. The Bluetooth range capped at 10 m makes it a weak fit for larger venues or open spaces where the source device may be at a distance. Additionally, users who rely on a broad wireless ecosystem — including Wi-Fi streaming, AirPlay, Chromecast, or Auracast — will find the connectivity options here insufficient for those workflows.

Design:

Ingress Protection (IP) rating	IP66
volume	5760 cm³
drivers count	2
has a neodymium magnet	✕
control panel placed on a device	✓
water resistance	Water resistant
travel bag is included	✕
has a touch screen	✕
has RGB lighting	✓
has a detachable cable	✕
is a neckband speaker	✕
has a remote control	✕
weight	3300 g
height	144 mm
width	320 mm
thickness	125 mm

The Sony ULT Field 5 has a fairly substantial physical footprint, measuring 320 mm wide, 144 mm tall, and 125 mm thick, with a total volume of 5,760 cm³ and a weight of 3,300 g. It houses two drivers and carries an IP66 rating, making it fully dustproof and protected against powerful water jets — a step above basic splash resistance. The unit features RGB lighting and a control panel mounted directly on the device, giving users hands-on access to its functions without needing a separate remote, which is not included. A travel bag is also not part of the package, and the speaker does not use neodymium magnets, a touch screen, or a detachable cable in its construction.

Sound quality:

has a subwoofer	✕
highest frequency	20000 Hz
lowest frequency	20 Hz
Has a passive radiator	✓

The Sony ULT Field 5 covers a frequency range of 20 Hz to 20,000 Hz, spanning the full extent of the standard audible spectrum. It includes a passive radiator, which assists in extending low-frequency output without the need for an active subwoofer — and indeed, no dedicated subwoofer is present in this configuration.

Power:

Battery life	25 hours
has a battery level indicator	✓
has a rechargeable battery	✓
has a removable battery	✕
has wireless charging	✕

The Sony ULT Field 5 is equipped with a built-in rechargeable battery rated at 25 hours of use, providing a solid runtime for extended sessions. A battery level indicator is included, letting users keep track of remaining charge at a glance. The battery is not removable, and the speaker does not support wireless charging, so recharging must be done via a wired connection.

Connectivity:

Bluetooth version	5.3
supports Bluetooth pairing using NFC	✕
has a socket for a 3.5 mm audio jack	✕
has an AUX input	✓
has aptX Lossless	✕
has LDAC	✓
has aptX Adaptive	✕
has aptX HD	✕
has aptX	✕
has aptX Low Latency	✕
has AAC	✕
has AirPlay	✕
has Chromecast built-in	✕
has Auracast	✕
has Bluetooth LE Audio	✕
maximum Bluetooth range	10 m
supports Wi-Fi	✕
USB ports	1
Has USB Type-C	✓
has a 3.5mm male connector	✕
has an external memory slot	✕
is DLNA-certified	✕
supports Ethernet	✕
has a microphone input	✕

The Sony ULT Field 5 connects wirelessly via Bluetooth 5.3 with a maximum range of 10 m, and supports LDAC for higher-resolution audio transmission over Bluetooth — though aptX in all its variants, AAC, and LE Audio are not supported. NFC pairing is absent, and the speaker does not offer Wi-Fi, AirPlay, Chromecast, Auracast, Ethernet, or DLNA connectivity. For wired audio input, an AUX input is available, while a single USB Type-C port handles charging; there is no 3.5 mm audio jack socket, no 3.5 mm male connector, no external memory slot, and no microphone input.

Features:

Can be used wirelessly	✓
supports a remote smartphone	✓
has fast pairing	✕
has voice commands	✕
Has a radio	✕
Has voice prompts	✓
has a mute function	✕
works as a power bank	✓
has a sleep timer	✓

The Sony ULT Field 5 can be used wirelessly and supports smartphone remote control, allowing playback management from a connected device. It includes voice prompts to guide users through operations, a sleep timer for automatic shutoff, and notably functions as a power bank to charge external devices. Fast pairing is not available, and the speaker does not offer voice commands, a built-in radio, or a mute function.

Miscellaneous:

supports pairing for stereo sound	✓

The Sony ULT Field 5 supports stereo pairing, allowing two compatible units to be linked together for a dedicated left and right channel stereo setup.

Final Verdict

The Sony ULT Field 5 is a rugged, high-capacity portable speaker built around endurance and outdoor resilience. Its IP66 rating combined with a 25-hour battery life makes it a dependable option for extended outdoor use, and practical additions like power bank functionality and LDAC support add genuine everyday utility. That said, its considerable weight and limited Bluetooth range mean it suits stationary outdoor setups far better than on-the-go use. For users who need a durable, feature-equipped speaker for outdoor gatherings and do not require broad wireless ecosystem support, the ULT Field 5 delivers a coherent and well-specified package.