Sony’s ULT FIELD 3 offers a useful middle ground between a tiny travel speaker and a heavier party model. A supplied shoulder strap, speakerphone and USB-C phone charging make it practical for a day out, while the ULT button gives quick access to its bass-focused tuning.
The main buying question is whether that tuning suits you. SoundGuys found the ULT mode engaging, but its character could not be preserved while adjusting the separate custom EQ. 1 That makes personal preference more important than simply counting the available EQ bands.
Sound
- Woofer and tweeter
- ULT mode
- Seven-band custom EQ
The FIELD 3 uses a woofer, separate tweeter and passive-radiator enclosure. One speaker plays in mono, while a second FIELD 3 enables stereo. For a moving listener outdoors that can be a sensible arrangement, since a tightly defined stereo seat is unlikely to remain fixed.
SoundGuys praised the low-end impact with ULT enabled but found the seven-band custom mode less satisfying when trying to recreate it. 1 The practical implication is to audition both modes if possible. An EQ menu is only useful if its starting sound and adjustment range suit the changes you want to make.
Connectivity
- Bluetooth
- Stereo Pair
- Party Connect
Stereo Pair and Party Connect address different needs. Two FIELD 3 units can make a left/right system, while Party Connect extends playback across compatible Sony speakers. Check the supported protocol before adding another generation, particularly as Sony’s newer tower range uses a different Party Chain system.
The microphone is a useful extra for calls when the phone is elsewhere on a table or in a bag. The USB-C connection serves charging and power output, so its presence should not be treated as proof of wired USB audio. Buyers who need an analog input have a clearer route in the larger FIELD 5.
Battery & charging
- 24 hours at volume 22
- 5 hours at maximum volume
- USB-C PD
Sony’s guide makes the volume tradeoff unusually clear. With ULT active and Battery Care disabled, it rates about 24 hours at volume 22 and five hours at the maximum level of 50. Those are manufacturer tests using its chosen material, but they demonstrate why a full-volume outing needs a different charging plan from background listening.
A full charge takes about three and a half hours with a suitable 9 V, 3 A USB PD adapter while the speaker is off. Battery Care limits charging to roughly 90% to reduce prolonged full-charge exposure, at the cost of runtime. The USB-C output can charge a phone at up to 5 V, 1.5 A, sharing the speaker’s reserve.
Design
The strap makes the 1.2 kg enclosure easier to carry between locations. It is still a deliberate addition to a walking bag, so a smaller speaker may be preferable if music is only an occasional part of the trip. The rectangular shape also deserves a quick check against the bag or storage space you intend to use.
IP67 covers dust and temporary immersion, with the port cover properly secured. Charging accessories and the exposed port have different limits from the closed speaker. Keeping the cable connection dry is the simple operational tradeoff for taking a rechargeable speaker near water.
Alternatives
The FIELD 5 adds stereo playback from one enclosure and a 3.5 mm input, with a substantial increase in size and weight. Choose the FIELD 3 when carrying ease and calls are more useful. Someone who already likes their current speaker’s tuning should not upgrade solely to obtain the ULT name.
Verdict
The FIELD 3 is a practical outdoor companion with useful ownership details and a clear bass-first option. It is best for a listener who enjoys ULT as supplied and wants the strap, calls and phone-charging conveniences. A buyer seeking fine control over that exact bass character should compare the sound modes carefully.