Short answer: the Ultimate Ears Boom 4 for better sound quality, the W-King D8 Mini for the lower price. The Ultimate Ears Boom 4 ranks #88 of 136 medium speakers at $105. The W-King D8 Mini ranks #106 at $38.93, $66.07 cheaper.
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%
What the W-King D8 Mini offers: 30W output with switchable indoor/outdoor EQ modes. IPX6 rated with a 5000mAh battery. Watch for: Recessed midrange, harsh treble. Bass doesn’t go as deep as others.
Buy the Ultimate Ears Boom 4 when sound quality outweighs the price for you, and the W-King D8 Mini when the price outweighs sound quality instead.
The W-King D8 Mini is not a sound-quality pick. It sits near the bottom of the 136 medium speakers; there are better options higher up.
If battery life is a priority, the W-King D8 Mini is rated for 24 hours versus 15 hours for the Ultimate Ears Boom 4.
Specifications Side By Side
| Ultimate Ears Boom 4 | W-King D8 Mini | |
|---|---|---|
| Price | $105 | $38.93 |
| Ranked | #88 of 136 in Medium Size Portable Bluetooth Speakers | #106 of 136 in Medium Size Portable Bluetooth Speakers |
| App | Yes | - |
| Battery Life | 15 hours (Manufacturer specified) | 24 hours (Manufacturer specified) |
| IP Rating | IP67 | IPX6 |
| Power Input | USB-C | USB-C |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| Weight | 1.4 lbs / 620 g | 2.8 lbs / 1260 g |
| Bluetooth Version | 5.1 | 5.0 |
| Dimensions | 7.2" x 2.9" x 2.9" (184 x 73 x 73 mm) | 9.9" x 3.7" x 3.7" (251 x 94 x 94 mm) |
| Drivers | 2x 1.57" (40mm) active drivers + 2x 1.81" x 2.57" (46.1 x 65.2mm) passive radiators | 2x 70mm woofers, 2x 30mm tweeters |
| TWS | Yes | No |
| EQ | Yes (via app) | - |
| Built in Microphone | No | Yes |
| Power Bank | No | - |
| Aux Input | No | Yes |
| Max Volume | 85dBC | 100dB |
| Digital Aux Input | No | No |
| Bass Extension (-10dB) | - | 63Hz |
| MicroSD Playback | - | Yes |
| Output Power | - | 30W |
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- Ultimate Ears Wonderboom vs Tribit Stormbox
- Bose SoundLink Color II vs W-King D8 Mini
- Soundcore Boom 3i vs W-King D8 Mini
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.
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The Two Speakers In Full
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
W-King D8 Mini: $38.93 Aliexpress eBay
Pros: 30W output with switchable indoor/outdoor EQ modes. IPX6 rated with a 5000mAh battery.
Cons: Recessed midrange, harsh treble. Bass doesn’t go as deep as others.
Full W-King D8 Mini review and specifications →
| Aux Input | Yes |
|---|---|
| Bass Extension (-10dB) | 63Hz |
| Battery Life | 24 hours (Manufacturer specified) |
| Bluetooth Version | 5.0 |
| Built in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 9.9" x 3.7" x 3.7" (251 x 94 x 94 mm) |
| Drivers | 2x 70mm woofers, 2x 30mm tweeters |
| IP Rating | IPX6 |
| Max Volume | 100dB |
| MicroSD Playback | Yes |
| Omnidirectional | No |
| Output Power | 30W |
| Power Input | USB-C |
| Stereo | Yes |
| TWS | No |
| Weight | 2.8 lbs / 1260 g |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- W-King D8 Mini vs Soundcore Flare 2
- W-King D8 Mini vs Sony SRS-XB30
- W-King D8 Mini vs Tribit Stormbox Mini+
- W-King D8 Mini vs Sony SRS-XE200
- W-King D8 Mini vs Marshall Emberton II
- W-King D8 Mini vs Marshall Emberton III
- W-King D8 Mini vs Bose SoundLink Color II
- W-King D8 Mini vs Tribit Stormbox Mini
- See all 71 comparisons