Short answer: the W-King X20 for output, the Ultimate Ears Epicboom for cleaner tuning. The X20 is rated 200W RMS and 330W peak with 112dB max volume, exceptional 24-hour battery life and a power bank, making it the far louder, longer-running speaker. The Epicboom answers with 17 hours and USB-C charging, and the X20’s rising response, rolled off upper treble and 700Hz and 1.2kHz peaks are real drawbacks.
Buy the Ultimate Ears Epicboom at $228.59 for a large speaker, or the W-King X20 at $229.99 for a boombox speaker instead.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Prices on this page were last checked November 7, 2026 at 7:34 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.
Specifications Side By Side
| Ultimate Ears Epicboom | W-King X20 | |
|---|---|---|
| Price | $228.59 | $229.99 after coupon |
| Ranked | #89 of 120 in Large Size Portable Bluetooth Speakers | #43 of 113 in Boombox Size Portable Bluetooth Speakers |
| Bass Extension (-10dB) | ~55Hz | ~42Hz |
| Battery Life | 17 hours (Manufacturer specified) | 24 hours (Manufacturer specified) |
| Weight | 4.3 lbs (1.97 kg) | 15.9 lbs (7200 g) |
| App | No | Yes (W-King app) |
| Aux Input | Yes | Yes |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| Built-in Microphone | Yes | No |
| EQ | No | Yes (App + button modes) |
| 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 | Yes |
| Bluetooth Version | 5.2 | 5.4 |
| Drivers | 1x 120mm woofer, 2x 45mm tweeters | 7.5” subwoofer + drivers |
| Dimensions | 4.7” x 9.5” x 6.4” (119 x 241 x 162 mm) | 19.9” x 8.5” x 10.6” (506 x 217 x 270 mm) |
| Frequency Response | 50Hz - 20kHz (Manufacturer specified) | - |
| Amplifier Power | 10W RMS | 330W peak / 200W RMS |
| Maximum SPL | 94dB (Manufacturer specified) | 112dB (measured by Alan Ross Reviews) |
| Digital Aux Input | No | No |
| Strap | Yes (built-in loop) | - |
| MicroSD Playback | - | Yes |
| USB Playback | - | Yes |
Related Speaker Comparisons
More top alternatives to W-King X20: