Short answer: the Ultimate Ears Epicboom for better sound quality, the W-King D9 for the lower price, though neither ranks well in its class. The Ultimate Ears Epicboom ranks #83 of 105 large speakers, rated 2.9/5, at $228.59. The W-King D9 ranks #91, rated 2.5/5, at $71.24, $157.35 cheaper. Both are rated below 3.0/5 among the 105 large speakers, so if sound quality matters, consider the Tribit Stormbox Lava instead, ranked #3 at $119.99.
The Ultimate Ears Epicboom is the better-sounding pick. 17 hour battery with USB-C charging (first UE portable with USB-C). The tradeoff: Not very deep bass for the size.
The W-King D9 is the deeper-bass, longer-running pick. A compact 4.4 lbs (2 kg) boombox with 60W RMS output, a claimed 106dB maximum level, a measured 47Hz -10dB bass point, IPX6 protection, power-bank output, USB-C charging, aux and microSD playback. Its bass reaches about 47Hz before falling 10dB, against 55Hz for the Ultimate Ears Epicboom. It is rated for 40 hours of battery against 17 for the Ultimate Ears Epicboom. Watch for: Treble rolls off early, limiting air and fine detail, while owner reports note Bluetooth interference and some noise at maximum speaker volume.
Buy the Ultimate Ears Epicboom when sound quality outweighs the price for you, and the W-King D9 when the price outweighs sound quality instead.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Specifications Side By Side
| Ultimate Ears Epicboom | W-King D9 | |
|---|---|---|
| Price | $228.59 | $71.24 |
| Ranked | #83 of 105 in Large Size Portable Bluetooth Speakers | #91 of 105 in Large Size Portable Bluetooth Speakers |
| Bass Extension (-10dB) | ~55Hz | 47Hz |
| Battery Life | 17 hours (Manufacturer specified) | 40 hours (Manufacturer specified) |
| Weight | 4.3 lbs (1.97 kg) | 4.4 lbs (2.0 kg) |
| App | No | No |
| Aux Input | Yes | Yes |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| Built-in Microphone | Yes | Yes |
| EQ | No | No |
| IP Rating | IPX7 | IPX6 |
| Party Mode | No | No |
| Power Bank | No | Yes (USB-A) |
| Power Input | USB-C | USB-C |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| TWS | Yes | No |
| Bluetooth Version | 5.2 | 5.3 |
| Drivers | 1x 120mm woofer, 2x 45mm tweeters | 2x 40mm drivers + passive radiators |
| Dimensions | 4.7” x 9.5” x 6.4” (119 x 241 x 162 mm) | 4.7” x 12.4” x 4.7” (120 x 315 x 120 mm) |
| Frequency Response | 50Hz - 20kHz (Manufacturer specified) | 80Hz - 16kHz (Manufacturer specified) |
| Amplifier Power | 10W RMS | 60W RMS |
| Maximum SPL | 94dB (Manufacturer specified) | 106dB (measured by Alan Ross Reviews) |
| Digital Aux Input | No | No |
| Strap | Yes (built-in loop) | No |
| MicroSD Playback | - | Yes |
Related Speaker Comparisons
How Ultimate Ears Epicboom compares with other leading options:
- Ultimate Ears Epicboom vs Vifa Helsinki
- JBL Xtreme 5 vs Ultimate Ears Epicboom
- Tribit Stormbox Lava vs Ultimate Ears Epicboom
- Ultimate Ears Epicboom vs Brane X
- Minirig 4 with subwoofer vs Ultimate Ears Epicboom
Prices on this page were last checked October 12, 2026 at 4:13 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 Epicboom: $228.59 Amazon $228.59 eBay
Pros: 17 hour battery with USB-C charging (first UE portable with USB-C). IP67 rating, floats in water. Made mostly from recycled fabric and plastic. Large best-sounding UE portable that still feels portable. 180ft Bluetooth range. Measured bass extension of ~55Hz (-10dB).
Cons: Not very deep bass for the size. Gets distorted at around 70-80% with bass thuds.
Full Ultimate Ears Epicboom review and specifications →
| Released | Sep 2023 (3 years ago) |
|---|---|
| Amplifier Power | 10W RMS |
| App | No |
| Aux Input | Yes |
| Bass Extension (-10dB) | ~55Hz |
| Battery Life | 17 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.2 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 4.7” x 9.5” x 6.4” (119 x 241 x 162 mm) |
| Drivers | 1x 120mm woofer, 2x 45mm tweeters |
| EQ | No |
| Frequency Response | 50Hz - 20kHz (Manufacturer specified) |
| IP Rating | IPX7 |
| Maximum SPL | 94dB (Manufacturer specified) |
| Omnidirectional | No |
| Party Mode | No |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | Yes |
| Strap | Yes (built-in loop) |
| TWS | Yes |
| Weight | 4.3 lbs (1.97 kg) |
- Links
- Reviews, Comparisons and Sound Samples
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- Jay’s Straight Up Reviews & More: Bass Check 💣 Treblab HD-360, Ultimate Ears EpicBoom, Marshall Middleton & JBL Pulse 5. Boom or Bust?
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W-King D9: $71.24 Amazon $71.24 eBay
Pros: A compact 2kg boombox with 60W RMS output, a claimed 106dB maximum level, a measured 47Hz -10dB bass point, IPX6 protection, power-bank output, USB-C charging, aux and microSD playback. Long-term owners praise its loud, punchy character and useful indoor/outdoor voicing for casual outdoor listening. Measured bass extension of 47Hz (-10dB).
Cons: Treble rolls off early, limiting air and fine detail, while owner reports note Bluetooth interference and some noise at maximum speaker volume. There is no app or adjustable EQ, and its bass does not reach as deep as larger rivals, so it is better suited to energetic background music than neutral listening.
Full W-King D9 review and specifications →
| Released | Dec 2020 (5 years ago) |
|---|---|
| Amplifier Power | 60W RMS |
| App | No |
| Aux Input | Yes |
| Bass Extension (-10dB) | 47Hz |
| Battery Life | 40 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.3 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 4.7” x 12.4” x 4.7” (120 x 315 x 120 mm) |
| Drivers | 2x 40mm drivers + passive radiators |
| EQ | No |
| Frequency Response | 80Hz - 16kHz (Manufacturer specified) |
| IP Rating | IPX6 |
| Maximum SPL | 106dB (measured by Alan Ross Reviews) |
| MicroSD Playback | Yes |
| Omnidirectional | No |
| Party Mode | No |
| Power Bank | Yes (USB-A) |
| Power Input | USB-C |
| Stereo | Yes |
| Strap | No |
| TWS | No |
| Weight | 4.4 lbs (2.0 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons