Short answer: the Sony ULT Field 3. It is IP67 rated with a 24-hour battery and an app with a 10-band EQ at $208, though it sounds a bit hollow with boosted treble and turning on ULT disables that EQ. The JBL Flip 4 has less bass than a Flip 5 and peaky lower treble, and battery failures are common.
Buy the Sony ULT Field 3. It is rated higher for sound quality; the JBL Flip 4 is no longer sold new.
If battery life is a priority, the Sony ULT Field 3 is rated for 24 hours versus 12 hours for the JBL Flip 4.
Want more options? Browse the full Portable Bluetooth rankings.
Specifications Side By Side
| Sony ULT Field 3 | JBL Flip 4 | |
|---|---|---|
| Price | $208.00 | $70 Discontinued |
| Ranked | #68 of 157 in Medium Size Portable Bluetooth Speakers | #76 of 157 in Medium Size Portable Bluetooth Speakers |
| App | Yes | Yes |
| Aux Input | No | Yes |
| Battery Life | 24 hours (Manufacturer specified) | 12 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC, AAC, LDAC | SBC |
| Bluetooth Version | 5.2 | 4.2 |
| Built-in Microphone | Yes | - |
| Dimensions | 10.1” x 4.4” x 3.1” (256 x 113 x 79 mm) | 6.9” x 2.8” x 2.6” (175 x 70 x 65 mm) |
| Drivers | 1x 20mm tweeter + 1x 86mm x 46mm woofer | 2x 40mm fullrange |
| EQ | Yes (App + ULT button) | No |
| IP Rating | IP67 | IPX7 |
| Party Mode | Yes (Party Connect up to 100 speakers) | Yes (Connect+ up to 100 speakers) |
| Power Bank | Yes (USB-C, 5V/1.5A) | - |
| Power Input | USB-C | Micro USB |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| TWS | Yes | No |
| Weight | 2.6 lbs (1.2 kg) | 1.1 lbs (510 g) |
| Amplifier Power | 27W | 16W RMS |
| Digital Aux Input | No | No |
| Strap | Yes (detachable shoulder strap) | Yes (lanyard) |
| Bass Extension (-10dB) | - | 66Hz |
| Bluetooth Latency | - | 300ms |
| Frequency Response | - | 70Hz - 20kHz (Manufacturer specified) |
| Maximum SPL | - | 92dB (Manufacturer specified) |
Related Speaker Comparisons
How Sony ULT Field 3 compares with other leading options:
- Sony ULT Field 3 vs Earfun Uboom L
- Soundcore Motion 300 vs Sony ULT Field 3
- Soundcore Motion+ vs Sony ULT Field 3
- Soundcore Boost “upgraded” 2021 vs Sony ULT Field 3
- Sony ULT Field 3 vs Minirig 4
Prices on this page were last checked October 3, 2026 at 10:26 PM UTC. Product prices and availability are accurate as of that date/time 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.
As an eBay Partner, we may be compensated if you make a purchase.
The Two Speakers In Full
Sony ULT Field 3: $208.00 Amazon eBay
Older models: the Sony XB33 (ranked lower, rated 3.4/5), the Sony SRS-XE300 (ranked lower, rated 2.8/5) and the Sony SRS-XB30 (ranked lower, rated 2.6/5).
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. Custom EQ and the ULT bass-boost button can’t be used together: turning on ULT disables the EQ. Bass is very weak with ULT off. Lost to the JBL Charge 6 in a side-by-side comparison despite being the larger speaker.
Full Sony ULT Field 3 review and specifications →
| Amplifier Power | 27W |
|---|---|
| App | Yes |
| Aux Input | No |
| Battery Life | 24 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC, AAC, LDAC |
| Bluetooth Version | 5.2 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 10.1” x 4.4” 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 |
| Omnidirectional | No |
| Party Mode | Yes (Party Connect up to 100 speakers) |
| Power Bank | Yes (USB-C, 5V/1.5A) |
| Power Input | USB-C |
| Stereo | Yes |
| Strap | Yes (detachable shoulder strap) |
| TWS | Yes |
| Weight | 2.6 lbs (1.2 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Sony ULT Field 3 vs Bose Soundlink Mini
- Sony ULT Field 3 vs Xiaomi Mi Portable
- Sony ULT Field 3 vs Sony XB33
- Sony ULT Field 3 vs Bose Soundlink Mini 2
- Sony ULT Field 3 vs Bose Portable Smart Speaker
- Sony ULT Field 3 vs Beats Pill 2024
- Sony ULT Field 3 vs Soundcore 3
- Sony ULT Field 3 vs JBL Flip 5
- See all 138 comparisons
JBL Flip 4: $70 Discontinued Amazon eBay
Newer model: the JBL Flip 7, ranked higher, rated 4.2/5.
Pros: At 510 g, JBL Flip 4 combines 2x 40mm fullrange with Bluetooth and aux. Claimed 12 hours (manufacturer specified) battery life, ipx7 protection, up to 92db and single-box playback make its feature set practical for its intended room or portable use. Measured bass extension of 66Hz (-10dB).
Cons: Bass is limited by its 66Hz specification. There is no companion app. No EQ adjustment. Battery failures are common. Discontinued.
Full JBL Flip 4 review and specifications →
| Amplifier Power | 16W RMS |
|---|---|
| App | Yes |
| Aux Input | Yes |
| Bass Extension (-10dB) | 66Hz |
| Battery Life | 12 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| Bluetooth Latency | 300ms |
| Bluetooth Version | 4.2 |
| Digital Aux Input | No |
| Dimensions | 6.9” x 2.8” x 2.6” (175 x 70 x 65 mm) |
| Drivers | 2x 40mm fullrange |
| EQ | No |
| Frequency Response | 70Hz - 20kHz (Manufacturer specified) |
| IP Rating | IPX7 |
| Maximum SPL | 92dB (Manufacturer specified) |
| Omnidirectional | No |
| Party Mode | Yes (Connect+ up to 100 speakers) |
| Power Input | Micro USB |
| Stereo | Yes |
| Strap | Yes (lanyard) |
| TWS | No |
| Weight | 1.1 lbs (510 g) |
- Links
- Reviews, Comparisons and Sound Samples
- DLX Willington: JBL Flip 5 vs Flip 4 :Sound Battle: Almost to the size of the JBL Charge 3? More from DLXWillington →
- GYMCADDY: Best $100 Speaker? JBL Flip 4 Vs Sony XB20 Vs UE WONDERBOOM Vs Altec Mini Lifejacket 2 More from GYMCADDY →
- GYMCADDY: Best $100 Speaker? JBL Flip 4 Vs Sony XB20 Vs UE WONDERBOOM Vs Altec Mini Lifejacket 2
- Head-to-Head Comparisons