Short answer: the W-King D320. It ranks #44 of 136 medium speakers by sound quality at $69.99; the Ultimate Ears Boom 4 ranks #88 and costs $105, which makes this an easy call rather than a real tradeoff.
What the W-King D320 offers: 40W output power, IP67 waterproof, 24-hour battery life, customizable EQ app with 6 preset modes, Bluetooth 5.3, AUX and MicroSD support, dual tweeters with passive radiators, USB-C charging Watch for: Not stereo. Warm tuning. Lacking some detail. Rolled off treble
What the Ultimate Ears Boom 4 offers: IP67 rated, floats, and finally charges via USB-C instead of the older Booms’ Micro-USB. 15 hour battery. Customizable EQ and speaker-pairing via the UE app. Watch for: Not much improvement over the old ones. Weak bass extension and thuddy bass. Gets distorted above 90%
Buy the W-King D320. It ranks higher for sound quality than the Ultimate Ears Boom 4 and costs less, so there is no real case for the other one.
If battery life is a priority, the W-King D320 is rated for 24 hours versus 15 hours for the Ultimate Ears Boom 4.
Specifications Side By Side
| W-King D320 | Ultimate Ears Boom 4 | |
|---|---|---|
| Price | $69.99 | $105 |
| Ranked | #44 of 136 in Medium Size Portable Bluetooth Speakers | #88 of 136 in Medium Size Portable Bluetooth Speakers |
| App | Yes | Yes |
| Aux Input | Yes | No |
| Battery Life | 24 hours (Manufacturer specified) | 15 hours (Manufacturer specified) |
| Built in Microphone | Yes | No |
| EQ | Yes | Yes (via app) |
| IP Rating | IP67 | IP67 |
| MicroSD Playback | Yes | - |
| Stereo | No | Yes |
| Omnidirectional | No | No |
| TWS | No | Yes |
| Bluetooth Version | 5.3 | 5.1 |
| Dimensions | 3.3" x 8.4" (83 x 214 mm) (diameter x height) | 7.2" x 2.9" x 2.9" (184 x 73 x 73 mm) |
| Drivers | 52mm x 91mm woofer, 2x 25mm tweeters + 2x passive radiators | 2x 1.57" (40mm) active drivers + 2x 1.81" x 2.57" (46.1 x 65.2mm) passive radiators |
| Frequency Response | 100Hz - 18kHz (Manufacturer specified) | - |
| Power Input | USB-C | USB-C |
| Output Power | 40W | - |
| Weight | 3.1 lbs / 1.4 kg | 1.4 lbs / 620 g |
| Digital Aux Input | No | No |
| Power Bank | - | No |
| Max Volume | - | 85dBC |
Related Speaker Comparisons
More useful head-to-heads from the same speaker class:
- Soundcore Motion 100 vs Ultimate Ears Boom 3
- Sony ULT Field 1 vs Ultimate Ears Wonderboom
- Soundcore Glow vs Klipsch Nashville
- Ultimate Ears Boom 4 vs Sony SRS-XE200
- JBL Flip 4 vs Ultimate Ears Boom 4
Prices on this page were last checked August 27, 2026 at 10:09 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
W-King D320: $69.99 Amazon Aliexpress eBay
Pros: 40W output power, IP67 waterproof, 24-hour battery life, customizable EQ app with 6 preset modes, Bluetooth 5.3, AUX and MicroSD support, dual tweeters with passive radiators, USB-C charging
Cons: Not stereo. Warm tuning. Lacking some detail. Rolled off treble
Full W-King D320 review and specifications →
| App | Yes |
|---|---|
| Aux Input | Yes |
| Battery Life | 24 hours (Manufacturer specified) |
| Bluetooth Version | 5.3 |
| Built in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 3.3" x 8.4" (83 x 214 mm) (diameter x height) |
| Drivers | 52mm x 91mm woofer, 2x 25mm tweeters + 2x passive radiators |
| EQ | Yes |
| Frequency Response | 100Hz - 18kHz (Manufacturer specified) |
| IP Rating | IP67 |
| MicroSD Playback | Yes |
| Omnidirectional | No |
| Output Power | 40W |
| Power Input | USB-C |
| Stereo | No |
| TWS | No |
| Weight | 3.1 lbs / 1.4 kg |
- Links
- Reviews, Comparisons and Sound Samples
- Techder Audios: W-king D320 VS Mifa Wildrod “DUAL VS SINGLE TWEETERS!” More from techderaudios →
- Audio y Mas 🔊: Altavoces JBL Flip 6 vs W-King D320: ¿Cuál es el mejor en calidad de sonido? 🔊
- Jay’s Straight Up Reviews & More: Ultimate Ears MegaBoom 4 vs W-King D320 🔋Does Paying More Get You Less? 😧 More from JaysStraightUpReviews →
- Reddit Search for W-King D320 Review
- Head-to-Head Comparisons
- W-King D320 vs Soundcore Glow
- W-King D320 vs Bose Soundlink Revolve+ II
- W-King D320 vs JBL Pulse 5
- W-King D320 vs Bose Soundlink Revolve+
- W-King D320 vs Tribit Stormbox Pro
- W-King D320 vs Bose Soundlink Revolve
- W-King D320 vs Soundcore Motion 100
- W-King D320 vs Tribit Stormbox Flow
- See all 70 comparisons
Ultimate Ears Boom 4: $105 Amazon eBay
Pros: IP67 rated, floats, and finally charges via USB-C instead of the older Booms’ Micro-USB. 15 hour battery. Customizable EQ and speaker-pairing via the UE app.
Cons: Not much improvement over the old ones. Weak bass extension and thuddy bass. Gets distorted above 90%
Full Ultimate Ears Boom 4 review and specifications →
| App | Yes |
|---|---|
| Aux Input | No |
| Battery Life | 15 hours (Manufacturer specified) |
| Bluetooth Version | 5.1 |
| Built in Microphone | No |
| Digital Aux Input | No |
| Dimensions | 7.2" x 2.9" x 2.9" (184 x 73 x 73 mm) |
| Drivers | 2x 1.57" (40mm) active drivers + 2x 1.81" x 2.57" (46.1 x 65.2mm) passive radiators |
| EQ | Yes (via app) |
| IP Rating | IP67 |
| Max Volume | 85dBC |
| Omnidirectional | No |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | Yes |
| TWS | Yes |
| Weight | 1.4 lbs / 620 g |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Ultimate Ears Boom 4 vs Ultimate Ears Boom 3
- Ultimate Ears Boom 4 vs Ultimate Ears Wonderboom
- Ultimate Ears Boom 4 vs Klipsch Groove/Heritage Groove
- Ultimate Ears Boom 4 vs Ultimate Ears Wonderboom 2
- Ultimate Ears Boom 4 vs Ultimate Ears Wonderboom 3
- Ultimate Ears Boom 4 vs Ultimate Ears Wonderboom 4
- Ultimate Ears Boom 4 vs Sony SRS-XE300
- Ultimate Ears Boom 4 vs Tribit Stormbox
- See all 74 comparisons