Short answer: the JBL Partybox Encore Essential 2. It ranks #6 of 112 boombox speakers by sound quality, rated 4.3/5, at $249.95. The Zealot ZE51 ranks #16, rated 4.1/5, at $235.33, $14.62 cheaper, a saving that is not big enough to make up the sound-quality gap.
The JBL Partybox Encore Essential 2 is the longer-running, lighter option. A compact party speaker with balanced sound, punchy bass, mic and guitar inputs, and enough volume for a backyard party. It is rated for 15 hours of battery against 4 for the Zealot ZE51. At 13.7 lbs (6.2 kg) it weighs much less than the Zealot ZE51 at 26 lbs (11.81 kg). Watch for: It is front-facing, so the sound changes noticeably to the sides and behind it, and bass compression reduces kick-drum impact at maximum volume.
The case for the Zealot ZE51: A big stereo boombox with clean, wide sound and low distortion at high volume for outdoor parties. The catch: The Zealot ZE41 still wins on raw bass depth and price.
Buy the JBL Partybox Encore Essential 2. It is rated higher for sound quality, and saving $14.62 with the Zealot ZE51 does not make up for the sound-quality gap.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
A compact party speaker with balanced sound, punchy bass, mic and guitar inputs, and enough volume for a backyard party.
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 2 | Zealot ZE51 | |
|---|---|---|
| Price | $249.95 | $235.33 after coupon |
| Ranked | #6 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 |
| Battery Life | 15 hours (Manufacturer specified) | 4 hours (Manufacturer specified) |
| Built-in Microphone | No | - |
| EQ | Yes (7 band App EQ) | Yes (Hi-Res, 3D Surround, Extra Bass, Vocal and other sound modes) |
| Guitar Input | Yes | - |
| IP Rating | IPX4 | IPX5 |
| Microphone Input | Yes (Karaoke mode with echo effect) | Yes (Karaoke mode) |
| Party Mode | Yes (Auracast) | - |
| Power Bank | Yes (USB-C) | 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 | 13.7 lbs (6.2 kg) | 26 lbs (11.81 kg) |
| Wireless Microphones | No | - |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC (inferred; additional codecs unverified) |
| Bluetooth Version | 5.4 | 5.3 |
| Amplifier Power | 100W RMS | 250W |
| Dimensions | 12.6” x 13.5” x 10.3” (319.5 x 342 x 260.4 mm) | 22.1” x 9.4” x 13” (562 x 238 x 331 mm) |
| Drivers | 1x 135mm (5.25”) woofer + 2x 20mm (0.75”) dome tweeters | 1x 133mm + 2x 93mm + 2x 45mm |
| Maximum SPL | 110dB (measured by Alan Ross Reviews) | - |
| Digital Aux Input | No | No |
| Lights | Yes | - |
| Strap | No | Yes (strap) |
| Bass Extension (-10dB) | 42Hz | - |
| Battery Capacity | - | 48000mAh (12x4000mAh) |
| Frequency Response | - | 20Hz - 20kHz (Manufacturer specified) |
| MicroSD Playback | - | Yes |
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