Short answer: the X20, and the ranking gap is enormous. It ranks #28 of 71 boombox speakers at $249.99; the S78 ranks #70 at $159.68, $90 less and near the very bottom of the class.
The S78’s spec sheet reads well: 120W RMS output, a 40-hour battery, a power bank function, and IP67 waterproofing. Our notes describe real problems in practice: it gets distorted above 50% volume, doesn’t have much bass, and its volume level fluctuates at high output.
The X20 answers with a 7.5-inch subwoofer and 330W peak power, with its own cons limited to a rising frequency response and peaks at 700Hz and 1.2kHz, modest by comparison.
Buy the X20. The $90 premium buys a speaker that actually works reliably at volume.
Specifications Side By Side
| W-King X20 | Zealot S78 | |
|---|---|---|
| Price | $249.99 after coupon | $91.38 |
| Ranked | #28 of 70 in Boombox Size Portable Bluetooth Speakers | #70 of 70 in Boombox Size Portable Bluetooth Speakers |
| App | Yes (W-King app) | No |
| Aux Input | Yes | Yes |
| Bass Extension (-10dB) | ~42Hz | - |
| EQ | Yes (App + button modes) | Yes (multiple modes) |
| IP Rating | IPX6 | IP67 |
| Max Volume | 112dB | - |
| MicroSD Playback | Yes | Yes |
| Power Bank | Yes | Yes |
| Power Input | USB-C | USB-C |
| Stereo | Yes | Yes |
| TWS | Yes | Yes |
| USB Playback | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| Party Mode | No | No |
| Built in Microphone | No | No |
| Output Power | 330W peak / 200W RMS | 120W RMS / 150W peak |
| Dimensions | 50.6cm x 21.7cm x 27cm | 41cm x 16.7cm x 18.5cm |
| Drivers | 7.5" subwoofer + drivers | 2x ~120mm (4.72") woofers + 2x ~42mm tweeters + 2x passive radiators |
| Weight | 15.9 lbs / 7200 g | 9.7 lbs / 4.4 kg |
| Battery Life | - | 40 hours (Manufacturer specified) |
The Two Speakers In Full
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 |
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- 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
Zealot S78: $91.38 Aliexpress Amazon
Pros: 120W RMS output with 150W peak power, exceptional 40-hour battery life, power bank function, IP67 waterproof, EQ with multiple modes, dual woofers with tweeters and passive radiators, MicroSD and USB playback, AUX input, TWS stereo pairing, USB-C charging
Cons: Gets distorted above 50%. Not much bass. Volume level fluctuates at high volume.
| App | No |
|---|---|
| Aux Input | Yes |
| Battery Life | 40 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Built in Microphone | No |
| Dimensions | 41cm x 16.7cm x 18.5cm |
| Drivers | 2x ~120mm (4.72") woofers + 2x ~42mm tweeters + 2x passive radiators |
| EQ | Yes (multiple modes) |
| IP Rating | IP67 |
| MicroSD Playback | Yes |
| Output Power | 120W RMS / 150W peak |
| Party Mode | No |
| Power Bank | Yes |
| Power Input | USB-C |
| Stereo | Yes |
| TWS | Yes |
| USB Playback | Yes |
| Weight | 9.7 lbs / 4.4 kg |
- Reviews, Comparisons and Sound Samples
- 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.