These are not really the same size class, and that is the honest framing here. The Ultimate Ears Epicboom ranks #56 of 75 large speakers at $239.99; the W-King X20 ranks #28 of 70 boombox speakers at $249.99.
On the Ultimate Ears Epicboom side: 17 hour battery with USB-C charging (first UE portable with USB-C). Set against that: Not very deep bass for the size.
The case for the W-King X20: 200W RMS output with 330W peak power, 112dB max volume, exceptional 24-hour battery life with power bank, IPX6 waterproof. The tradeoff: Rising frequency response but upper treble rolled off, 700hz and 1.2khz peaks.
Buy the Ultimate Ears Epicboom at $239.99 if you want a large speaker. Buy the W-King X20 at $249.99 if you want a boombox speaker instead.
Specifications Side By Side
| Ultimate Ears Epicboom | W-King X20 | |
|---|---|---|
| Price | $239.99 | $249.99 after coupon |
| Ranked | #56 of 75 in Large Size Portable Bluetooth Speakers | #28 of 70 in Boombox Size Portable Bluetooth Speakers |
| Bass Extension (-10dB) | ~55Hz | ~42Hz |
| Battery Life | 17 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 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 |
| Power Input | USB-C | USB-C |
| Stereo | Yes | Yes |
| TWS | Yes | Yes |
| Bluetooth Version | 5.2 | - |
| Drivers | 1x 120mm woofer, 2x 45mm tweeters | 7.5" subwoofer + drivers |
| Dimensions | 4.69" x 9.49" x 6.38" (119 x 241 x 162 mm) | 50.6cm x 21.7cm x 27cm |
| Frequency Response | 50Hz - 20kHz (Manufacturer specified) | - |
| Output Power | 10W RMS | 330W peak / 200W RMS |
| Max Volume | 94dB | 112dB |
| MicroSD Playback | - | Yes |
| USB Playback | - | Yes |
The Two Speakers In Full
Ultimate Ears Epicboom: $239.99 Amazon
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.
Cons: Not very deep bass for the size. Gets distorted at around 70-80% with bass thuds.
| App | No |
|---|---|
| Aux Input | Yes |
| Bass Extension (-10dB) | ~55Hz |
| Battery Life | 17 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.2 |
| Built in Microphone | Yes |
| Dimensions | 4.69" x 9.49" x 6.38" (119 x 241 x 162 mm) |
| Drivers | 1x 120mm woofer, 2x 45mm tweeters |
| EQ | No |
| Frequency Response | 50Hz - 20kHz (Manufacturer specified) |
| IP Rating | IPX7 |
| Max Volume | 94dB |
| Output Power | 10W RMS |
| Party Mode | No |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | Yes |
| TWS | Yes |
| Weight | 4.3 lbs / 1.97 kg |
- Reviews, Comparisons and Sound Samples
- Jay’s Straight Up Reviews & More: Bass Check 💣 Treblab HD-360, Ultimate Ears EpicBoom, Marshall Middleton & JBL Pulse 5. Boom or Bust?
- Jay’s Straight Up Reviews & More: $350 Ultimate Ears EpicBoom gets Epic Beat-Down 😮by $120 Soundcore Rave Neo 2. Bluetooth Speaker KO🤛
- Jay’s Straight Up Reviews & More: Bose SoundLink Max vs. Ultimate Ears EpicBoom 🤑Big Bucks No Whammies? 💣 Let’s Find Out 😧
- Head-to-Head Comparisons
- Links
W-King X20: $249.99 after coupon Amazon
Pros: 200W RMS output with 330W peak power, 112dB max volume, exceptional 24-hour battery life with power bank, IPX6 waterproof, EQ with app control and button modes, 7.5-inch subwoofer, Bluetooth 5.3, dual pairing, MicroSD and USB playback, AUX input, TWS stereo mode with 240W combined
Cons: Rising frequency response but upper treble rolled off, 700hz and 1.2khz peaks
| App | Yes (W-King app) |
|---|---|
| Aux Input | Yes |
| Bass Extension (-10dB) | ~42Hz |
| Bluetooth Codecs | SBC |
| Built in Microphone | No |
| Dimensions | 50.6cm x 21.7cm x 27cm |
| Drivers | 7.5" subwoofer + drivers |
| EQ | Yes (App + button modes) |
| IP Rating | IPX6 |
| Max Volume | 112dB |
| MicroSD Playback | Yes |
| Output Power | 330W peak / 200W RMS |
| Party Mode | No |
| Power Bank | Yes |
| Power Input | USB-C |
| Stereo | Yes |
| TWS | Yes |
| USB Playback | Yes |
| Weight | 15.9 lbs / 7200 g |
- Reviews, Comparisons and Sound Samples
- Alan Ross Reviews: Soundcore Boom 2 Plus Review - worst boombox speaker under $400?
- Alan Ross Reviews: pound for pound battle! WKing X20 D20 vs Stormbox Blast! OMG its a shocker!
- Alan Ross Reviews: W-King X20 JBL Boombox 3 killer! this should be illegal! - I was shocked!
- Jagist reviews: W-king X20 Vs Jbl Encore!!! 😁😁😁
- Jagist reviews: W-king X20 Vs Skullcandy Barrel XT!!! 🤔😋
- Mateusz Cholewa: Soundcore RAVE 3 🤗v🆚s W- KING X20🎶
- Jay’s Straight Up Reviews & More: New! W-King X20 vs JBL Boombox 3 🛜 Head to Head 🔋Battery Powered 📊Custom EQ - Links In Description
- Jay’s Straight Up Reviews & More: W-King X20 vs Tribit Stormbox Blast 🍿 Garage Battle of Boombox Speakers 🍻Custom & Standard EQ’s
- Jagist reviews: LG xboom Stage 301 Vs W-king X20!!!
- Techder Audios: W-king X20 VS Zealot S95 DEEP BASS VS DEEPER & LOUDER BASS?!
- Jagist reviews: LG xboom Stage 301 Vs W-king X20!!!
- Jagist reviews: W-king X20 Vs Gemini GRV-650L!!! 😍😍😍
- Jagist reviews: Bugani Boost Max Vs W-king X20!!! 😍😍😍
- Jay’s Straight Up Reviews & More: W-King X20 vs Zealot S78 Bluetooth Boombox Battle Outdoor Tailgater Special 🚗 Let the Whoopin’ Begin
- Head-to-Head Comparisons
- Links
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Product prices and availability were last checked August 9, 2026 at 6:57 AM UTC 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.