Different classes, so treat this as a step-up-or-not question rather than a head-to-head. The JBL Partybox Stage 320 ranks #3 of 53 party speakers by sound quality at $569.95; the Zealot ZE51 ranks #16 of 113 boombox speakers by sound quality at $235.33.
Different sizes. The Stage 320 is a 36.4 lbs (16.5 kg) party speaker. The ZE51 is an 26 lbs (11.8 kg) boombox. Each is rated within its own class.
The ZE51 has cleaner sound and a wider soundstage than the ZE41, with less distortion at high volume. Its claimed battery is only 4 hours.
The Stage 320 keeps more bass at high volume than the PartyBox 310, with wheels, a removable battery with a claimed 18 hours, and mic and guitar inputs.
Buy the JBL Partybox Stage 320 ($569.95) for a party speaker; the Zealot ZE51 ($235.33) suits a boombox speaker instead.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
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.
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Specifications Side By Side
| JBL Partybox Stage 320 | Zealot ZE51 | |
|---|---|---|
| Price | $569.95 | $235.33 after coupon |
| Ranked | #3 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 | 5.4 | 5.3 |
| Drivers | 2x 6.5” woofers, 2x 25mm tweeters | 1x 133mm + 2x 93mm + 2x 45mm |
| EQ | Yes (5 band) | 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-A, 5V/2.1A) | 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 | 36.4 lbs (16.5 kg) | 26 lbs (11.81 kg) |
| Amplifier Power | 240W | 250W |
| Digital Aux Input | No | No |
| Lights | Yes | - |
| Wheels | Yes | - |
| Dimensions | 26.3”H x 13.2”W x 15.2”D (669 x 335 x 385 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 |
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