Head-to-head · Best Portable Bluetooth Speakers Under $100

Sony SRS-XB100 vs Ultimate Ears WONDERBOOM 4

Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.

The short answer

Ultimate Ears WONDERBOOM 4 comes out ahead by a narrow margin (4.2 vs 4.4). The gap is mostly about Hikers, campers and poolside listeners who want the toughest, most weatherproof speaker under $100 with consistent 360-degree sound. — read the strengths below before deciding.

Ranked #4 in Best Portable Bluetooth Speakers Under $100

Sony SRS-XB100

4.2

$38.57as of Jun 7

The Sony SRS-XB100 is the best truly tiny Bluetooth speaker under $100, packing surprisingly full, bass-forward sound and a built-in mic into a body the size of a soda can. Its IP67 rating, roughly 16-hour battery and 274g weight make it a brilliant shower, hiking and travel speaker. It can't fill a big space and its app is bare-bones, but for portable, balanced sound on a budget it's a standout value.

Strengths

— Impressively full, balanced sound and bass for such a tiny speaker
— Excellent portability at just 274g, fits in a cup holder or jacket pocket
— IP67 waterproof and dustproof for shower and poolside use

Watch-outs

— Not powerful enough to fill a medium room or backyard
— Treble is slightly dampened by the speaker's upward-firing position
— Sparse features in the Sony Music Center app

$38.57 · Check Price on Amazon Full review →

Higher ratedRanked #2 in Best Portable Bluetooth Speakers Under $100

Ultimate Ears WONDERBOOM 4

4.4

$69.99as of Jun 7

The Ultimate Ears WONDERBOOM 4 is the most rugged, take-anywhere speaker under $100, combining an IP67 rating with a floating, drop-proof body and omnidirectional 360-degree sound. It's punchy for its size and now charges over USB-C, making it the ideal companion for a hike, pool or shower. The downsides are that it's only a small step up from the Wonderboom 3 and still lacks app support, but as a grab-and-go durable speaker it's hard to beat.

Strengths

— Genuinely durable: IP67 dust- and waterproof rating plus a drop-proof, floating design
— Omnidirectional 360-degree sound that stays consistent no matter how it's placed
— Surprisingly punchy bass and Outdoor Boost mode for open spaces

Watch-outs

— Only a modest upgrade over the Wonderboom 3
— Still not supported by the Ultimate Ears companion app, so no EQ
— Not powerful enough to fill a large room or big backyard

$69.99 · Check Price on Amazon Full review →

How they stack up

Sony SRS-XB100

The Sony SRS-XB100 is the smallest and cheapest of the durable picks here, more pocketable than the JBL Flip 6 and Ultimate Ears Wonderboom 4 while sharing their IP67 rating. Unlike the JBL Clip 5 it has no carabiner but adds a built-in microphone for calls, and like the Clip 5 and Anker Soundcore 2 it's a personal-listening speaker that can't match the Flip 6 or Wonderboom 4 for room-filling volume.

Ultimate Ears WONDERBOOM 4

The Ultimate Ears Wonderboom 4 is the durability champion of this group, matching the JBL Flip 6's IP67 rating but adding a floating, drop-proof design and omnidirectional 360-degree output the Flip 6's forward-firing drivers don't offer. It's more rugged and more pocketable than the Flip 6 but pushes less volume, and like the Sony SRS-XB100 and Anker Soundcore 2 it's aimed at personal and small-group listening rather than filling a space.

Specs side-by-side

Spec	Sony SRS-XB100	Ultimate Ears WONDERBOOM 4
Driver	46mm full-range + passive radiator	—
Battery Life	Up to 16 hours	Up to 14 hours
Waterproofing	IP67 (waterproof + dustproof)	IP67 (waterproof + dustproof), floats
Bluetooth	5.3	5.2
Microphone	Built-in (hands-free calls)	—
Weight	274 g	424 g
Mounting	Detachable multi-way strap	—
Charging	USB-C	USB-C
Drivers	—	Dual drivers + dual passive radiators (360-degree)
Range	—	Up to 131 ft (40 m)
Modes	—	Outdoor Boost, Podcast mode

← See the full ranking of best portable bluetooth speakers under $100