These are not really the same size class, and that is the honest framing here. The JBL Partybox 330 ranks #2 of 53 party speakers by sound quality at $629.95; the Zealot ZE51 ranks #16 of 113 boombox speakers by sound quality at $235.33.
The JBL Partybox 330 is the longer-running option. A rolling party speaker with deep bass, a removable battery, a light show and inputs for mics and a guitar. It is rated for 18 hours of battery against 4 for the Zealot ZE51. The tradeoff: It remains very large and heavy, and the sound improvement over the JBL Partybox Stage 320 is modest rather than transformational.
The Zealot ZE51 is the lighter choice. A big stereo boombox with clean, wide sound and low distortion at high volume for outdoor parties. At 26 lbs (11.81 kg) it weighs noticeably less than the JBL Partybox 330 at 37.7 lbs (17.1 kg). The tradeoff: The Zealot ZE41 still wins on raw bass depth and price.
Buy the JBL Partybox 330 at $629.95 for a party speaker, or the Zealot ZE51 at $235.33 for a boombox speaker instead.
Want more options? Browse the full 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
| JBL Partybox 330 | Zealot ZE51 | |
|---|---|---|
| Price | $629.95 | $235.33 after coupon |
| Ranked | #2 of 53 in Party Size Portable Bluetooth Speakers | #16 of 113 in Boombox Size Portable Bluetooth Speakers |
| App | Yes | Yes |
| Aux Input | Yes | Yes |
| Battery Life | 18 hours (Manufacturer specified) | 4 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC (inferred; additional codecs unverified) |
| Bluetooth Version | 6.0 | 5.3 |
| Charging Time | 3 hours | - |
| Drivers | 2x 6.5” (165mm) woofers + 2x 1” (25mm) PEN dome tweeters | 1x 133mm + 2x 93mm + 2x 45mm |
| EQ | Yes (Smart EQ mode) | 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) |
| Inputs | Optical | - |
| Party Mode | Yes (Auracast) | - |
| Power Bank | Yes (USB-C, 5V/1A) | Yes (USB-A + USB-C) |
| Power Input | AC Power cord | Type-C |
| Removable Battery | Yes | - |
| Stereo | Partially | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| USB Playback | Yes | Yes |
| Weight | 37.7 lbs (17.1 kg) | 26 lbs (11.81 kg) |
| Amplifier Power | 280W | 250W |
| Digital Aux Input | No | No |
| Lights | Yes | - |
| Wheels | Yes | - |
| Dimensions | 26.1”H x 13.1”W x 14.8”D (662.5 x 334 x 375 mm) | 22.1” x 9.4” x 13” (562 x 238 x 331 mm) |
| Strap | No | Yes (strap) |
| Battery Capacity | - | 48000mAh (12x4000mAh) |
| Frequency Response | - | 20Hz - 20kHz (Manufacturer specified) |
| MicroSD Playback | - | Yes |
Related Speaker Comparisons
More worthwhile head-to-heads for JBL Partybox 330: