Short answer: the Bose Soundlink Flex 2nd gen. It ranks #33 of 134 medium speakers at $129; the Sony ULT Field 3 ranks #57 and costs $148, so there is not much of a tradeoff to weigh.
The case for the Bose Soundlink Flex 2nd gen: Pretty much identical sounding to the 1st gen. The tradeoff: Not stereo.
What the Sony ULT Field 3 gets right: IP67 rated, dustproof and water resistant. Set against that: Sounds a bit hollow, a bit boosted in the treble.
Buy the Bose Soundlink Flex 2nd gen if the ranking matters more than the price. Buy the Sony ULT Field 3 if the price matters more than the ranking.
Specifications Side By Side
| Bose Soundlink Flex 2nd gen | Sony ULT Field 3 | |
|---|---|---|
| Price | $129.00 | $148 |
| Ranked | #33 of 134 in Medium Size Portable Bluetooth Speakers | #57 of 134 in Medium Size Portable Bluetooth Speakers |
| App | Yes | Yes |
| Battery Life | 12 hours (Manufacturer specified) | 24 hours (Manufacturer specified) |
| Built in Microphone | Yes | Yes |
| EQ | Yes (3 band) | Yes (App + ULT button) |
| IP Rating | IP67 | IP67 |
| Party Mode | Yes (Bose Party mode) | Yes (Party Connect up to 100 speakers) |
| Power Input | USB-C | USB-C |
| Stereo | No | Yes |
| TWS | Yes | Yes |
| Weight | 1.3 lbs / 586 g | 2.6 lbs / 1.2 kg |
| Bluetooth Version | 5.3 | 5.2 |
| Dimensions | 7.9" x 3.6" x 2.1" (201 x 90 x 52 mm) | 10.1" x 4.5" x 3.1" (256 x 113 x 79 mm) |
| Aux Input | No | No |
| Drivers | 60mm full-range driver with passive radiators | 1x 20mm tweeter + 1x 86mm x 46mm woofer |
| Bluetooth Codecs | SBC, AAC, aptX Adaptive | SBC, AAC, LDAC |
| Power Bank | - | Yes |
| Output Power | - | 27W |
The Two Speakers In Full
Bose Soundlink Flex 2nd gen: $129.00 Amazon
Pros: Pretty much identical sounding to the 1st gen
Cons: Not stereo. Warm sounding with overly boosted bass which drowns out midrange detail. Self drains the battery about 10% a week.
| App | Yes |
|---|---|
| Aux Input | No |
| Battery Life | 12 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC, AAC, aptX Adaptive |
| Bluetooth Version | 5.3 |
| Built in Microphone | Yes |
| Dimensions | 7.9" x 3.6" x 2.1" (201 x 90 x 52 mm) |
| Drivers | 60mm full-range driver with passive radiators |
| EQ | Yes (3 band) |
| IP Rating | IP67 |
| Party Mode | Yes (Bose Party mode) |
| Power Input | USB-C |
| Stereo | No |
| TWS | Yes |
| Weight | 1.3 lbs / 586 g |
- Reviews, Comparisons and Sound Samples
- Joy & Oluv’Sone: Bose Soundlink Flex 2nd gen vs Flex
- Oluv Patreon: Bose Soundlink Flex 2nd gen - sound demo
- Tô Thái Trí Hùng: Unbox & Sound Test - Bose Soundlink Flex 2
- Joy & Oluv’Sone: Bose Soundlink Flex 2nd gen & Soundcore Motion 300 sound test
- Alan Ross: Hall of Fame classic vs latest Bose tech!
- CEONTHEMAKING: Bose Soundlink Flex 2nd Gen VS Marshall Emberton III - What’s NEW??
- Alan Ross - The Anti Shill!: Small speaker, mighty sound, The Flex gen 2 shatters physics!
- Head-to-Head Comparisons
- Links
Sony ULT Field 3: $148 Amazon
Pros: IP67 rated, dustproof and water resistant. 24 hour battery life. App with 10-band EQ. Party Connect with up to 100 speakers. USB-C in/out for charging your phone.
Cons: Sounds a bit hollow, a bit boosted in the treble.
| App | Yes |
|---|---|
| Aux Input | No |
| Battery Life | 24 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC, AAC, LDAC |
| Bluetooth Version | 5.2 |
| Built in Microphone | Yes |
| Dimensions | 10.1" x 4.5" x 3.1" (256 x 113 x 79 mm) |
| Drivers | 1x 20mm tweeter + 1x 86mm x 46mm woofer |
| EQ | Yes (App + ULT button) |
| IP Rating | IP67 |
| Output Power | 27W |
| Party Mode | Yes (Party Connect up to 100 speakers) |
| Power Bank | Yes |
| Power Input | USB-C |
| Stereo | Yes |
| TWS | Yes |
| Weight | 2.6 lbs / 1.2 kg |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Sony ULT Field 3 vs JBL Charge 6
- Sony ULT Field 3 vs Sony ULT Field 1
- Sony ULT Field 3 vs KEF Muo gen2
- Sony ULT Field 3 vs Marshall Emberton II
- Sony ULT Field 3 vs Minirig 2
- Sony ULT Field 3 vs Minirig 3
- Sony ULT Field 3 vs Sony SRS-XE300
- Sony ULT Field 3 vs Tribit Stormbox Mini+
- Sony ULT Field 3 vs Turtlebox Ranger
- Sony ULT Field 3 vs Yamaha True X Speaker 1A
- Sony ULT Field 3 vs JBL Charge Essential 2
- Sony ULT Field 3 vs JBL Flip 7
- Sony ULT Field 3 vs JBL Flip Essential
- Sony ULT Field 3 vs Marshall Emberton III
- Sony ULT Field 3 vs Ultimate Ears Megaboom 3
- Sony ULT Field 3 vs Xiaomi Sound Party
- Sony ULT Field 3 vs Harman Kardon Luna
- Sony ULT Field 3 vs Huawei Sound Joy
- Sony ULT Field 3 vs JBL Charge 5
- Sony ULT Field 3 vs JBL Flip 6
- Sony ULT Field 3 vs Sonos Roam
- Sony ULT Field 3 vs Sonos Roam 2
- Sony ULT Field 3 vs Sony SRS-XB20
- Sony ULT Field 3 vs Sony XB33
- Sony ULT Field 3 vs Soundcore Boom 3i
- Sony ULT Field 3 vs Ultimate Ears Boom 3
- Links
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Product prices and availability were last checked August 9, 2026 at 6:57 AM UTC and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.