Short answer: the JBL Partybox Encore Essential. It ranks #8 of 112 boombox speakers by sound quality, rated 4.2/5, at $299.95. The Zealot ZE51 ranks #16, rated 4.1/5, at $235.33, $64.62 cheaper, a saving that is not big enough to make up the sound-quality gap.
The JBL Partybox Encore Essential is the lighter option. A compact stereo party speaker with great sound, strong output, and splash resistance for backyard parties. At 13 lbs (5.9 kg) it weighs much less than the Zealot ZE51 at 26 lbs (11.81 kg).
What the Zealot ZE51 does well: A big stereo boombox with clean, wide sound and low distortion at high volume for outdoor parties. Watch for: The Zealot ZE41 still wins on raw bass depth and price.
Buy the JBL Partybox Encore Essential. It is rated higher for sound quality, and the $64.62 saving on the Zealot ZE51 is not enough to make up the difference.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
A compact stereo party speaker with great sound, strong output, and splash resistance for backyard parties.
A big stereo boombox with clean, wide sound and low distortion at high volume for outdoor parties.
Prices on this page were last checked October 31, 2026 at 7:11 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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Specifications Side By Side
| JBL Partybox Encore Essential | Zealot ZE51 | |
|---|---|---|
| Price | $299.95 | $235.33 after coupon |
| Ranked | #8 of 112 in Boombox Size Portable Bluetooth Speakers | #16 of 112 in Boombox Size Portable Bluetooth Speakers |
| App | Yes (JBL PartyBox app) | Yes |
| Aux Input | Yes | Yes |
| Aux Latency | 17ms | - |
| Bass Extension (-10dB) | 38Hz | - |
| Battery Life | 6 hours (Manufacturer specified) | 4 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC (inferred; additional codecs unverified) |
| Built-in Microphone | No | - |
| EQ | Yes (3 band App EQ) | Yes (Hi-Res, 3D Surround, Extra Bass, Vocal and other sound modes) |
| IP Rating | IPX4 | IPX5 |
| Bluetooth Latency | 100ms | - |
| Party Mode | Yes (PartyBoost up to 100 speakers) | - |
| Power Bank | Yes (USB-A, 5V/0.5A) | Yes (USB-A + USB-C) |
| Power Input | AC Power cord | Type-C |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| USB Playback | Yes | Yes |
| Weight | 13 lbs (5.9 kg) | 26 lbs (11.81 kg) |
| Bluetooth Version | 5.1 | 5.3 |
| Amplifier Power | 100W RMS | 250W |
| Dimensions | 10.9” x 12.9” x 11.5” (276 x 327 x 293 mm) | 22.1” x 9.4” x 13” (562 x 238 x 331 mm) |
| Drivers | 135mm woofer + 2x 44mm tweeters | 1x 133mm + 2x 93mm + 2x 45mm |
| Maximum SPL | 110dB (measured by Alan Ross Reviews) | - |
| Digital Aux Input | No | No |
| Strap | No | Yes (strap) |
| Battery Capacity | - | 48000mAh (12x4000mAh) |
| Frequency Response | - | 20Hz - 20kHz (Manufacturer specified) |
| Microphone Input | - | Yes (Karaoke mode) |
| MicroSD Playback | - | Yes |
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