PORTABLE SPEAKERS / SIDE-BY-SIDE

Bose SoundLink Flex (2nd Gen) vs Sony ULT FIELD 1

Both makers list an IP67 rating and up to 12 hours of playback. The practical differences in these records are Bose's utility loop and Sony's multi-way strap and bass-emphasis button.

US edition · Sources reviewed September 27, 2026 and September 27, 2026

THE DECISION

What matters for this pair

Start with the carrying method you prefer and whether a dedicated bass control is useful. If audio quality is decisive, listen to both or consult transparent independent measurements.

BEFORE BUYING

Check this carefully

The matching 12-hour headlines use each maker's own conditions and do not guarantee identical runtime at your volume.

A CLOSER LOOK

Compare the details.

2 products in this comparison

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Product comparison: Bose SoundLink Flex (2nd Gen) and Sony ULT FIELD 1
YOUR SHORTLIST2 products4 specifications	Bose SoundLink Flex (2nd Gen) Full details	Sony ULT FIELD 1 Full details
01 / Everyday fit
Who it may suit	Consider it if you want a compact speaker to move between a room, a bag and an outdoor setting.	Consider it if you want a carrying strap and a direct control for changing bass emphasis.
Worth checking	Check the second-generation model specifically. Water resistance has conditions and does not mean the speaker can be charged while wet.	A bass button is a feature, not a measured sound-quality advantage. Volume and usage affect battery life; follow Sony's guidance for closing the protective cap around water.
02 / Specifications
Connection	Bluetooth	Bluetooth
Battery claim	Up to 12 hoursmanufacturer test conditions apply	Up to 12 hoursvaries with use
Ingress rating	IP67manufacturer's conditions apply	IP67manufacturer's conditions apply
Carrying	Nylon utility loop	Multi-way strap
03 / Sources & freshness
Source & review dateManufacturer information	Bose US · SoundLink Flex Portable Speaker (2nd Gen) (opens a new tab) Reviewed Sep 27, 2026	Sony US · ULT FIELD 1 (opens a new tab) Reviewed Sep 27, 2026

Based on manufacturer information, not hands-on tests. The differences filter compares listed wording; similar wording can describe different test conditions. “Not verified” means a detail is missing from our research, not that a feature is absent.

READY TO NARROW IT DOWN?

Check the option that fits your priorities.

Our comparison is a starting point. Confirm the exact model and current purchase terms before you leave.

Bose SoundLink Flex (2nd Gen)

Consider it if you want a compact speaker to move between a room, a bag and an outdoor setting.

Before deciding: Check the second-generation model specifically. Water resistance has conditions and does not mean the speaker can be charged while wet.

See the evidence and source

Sony ULT FIELD 1

Consider it if you want a carrying strap and a direct control for changing bass emphasis.

Before deciding: A bass button is a feature, not a measured sound-quality advantage. Volume and usage affect battery life; follow Sony's guidance for closing the protective cap around water.

See the evidence and source

Check the original sources

Product specifications, availability and terms can change. Follow each manufacturer's current information before deciding.

Bose US · SoundLink Flex Portable Speaker (2nd Gen) (opens a new tab) · reviewed September 27, 2026
Sony US · ULT FIELD 1 (opens a new tab) · reviewed September 27, 2026

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PUBLISHED COMPARISONS

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These pages put two products side by side with source links and a specific decision point for each pair.