Different classes, so treat this as a step-up-or-not question rather than a head-to-head. The JBL Partybox 330 ranks #2 of 53 party speakers by sound quality at $629.95; the Yeahbox Sonic Boom Ultra ranks #11 of 113 boombox speakers by sound quality at $388.
Different sizes. The PartyBox 330 is a 37.7 lbs (17.1 kg) party speaker on wheels with 280W. The Sonic Boom Ultra is an 24.3 lbs (11 kg) boombox with a 6x9 inch racetrack woofer. Each is rated within its own class.
The Sonic Boom Ultra is built for loudness and TV. It was the loudest boombox in comparison tests, reaches audible bass near 30Hz on its Country preset, and has HDMI ARC so it can double as a soundbar. It gets noisy above about 80 to 90% volume, its custom EQ reduces bass and does not persist, and it has no Auracast or removable battery.
The PartyBox 330 is the complete package: removable battery with a claimed 18 hours, wheels, a light show, Auracast, USB-C lossless and optical inputs, and dual mic and guitar inputs. It dropped the dedicated mic gain knobs of older PartyBoxes.
Buy the JBL Partybox 330 at $629.95 if you want a party speaker. Buy the Yeahbox Sonic Boom Ultra at $388 if you want 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 330 | Yeahbox Sonic Boom Ultra | |
|---|---|---|
| Price | $629.95 | $388.00 |
| Ranked | #2 of 53 in Party Size Portable Bluetooth Speakers | #11 of 113 in Boombox Size Portable Bluetooth Speakers |
| App | Yes | Yes |
| Aux Input | Yes | Yes |
| Battery Life | 18 hours (Manufacturer specified) | 24 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC (inferred; additional codecs unverified) |
| Bluetooth Version | 6.0 | 6.0 |
| Charging Time | 3 hours | - |
| Drivers | 2x 6.5” (165mm) woofers + 2x 1” (25mm) PEN dome tweeters | 6x9in racetrack woofer (200W) + 2x 4.5in midrange (40W each) + 2x tweeters (20W each), true 3-way |
| EQ | Yes (Smart EQ mode) | Yes (Country, Classic, and custom app EQ; custom settings don’t persist after the app closes) |
| Guitar Input | Yes | - |
| IP Rating | IPX4 | IPX6 |
| Microphone Input | Yes (Karaoke mode with echo effect) | - |
| Inputs | Optical | HDMI ARC (in/out, usable as a TV soundbar), AUX in/out, USB drive, microSD, optional wired mic |
| Party Mode | Yes (Auracast) | No (TWS stereo pairing of 2 units only, no Auracast) |
| Power Bank | Yes (USB-C, 5V/1A) | - |
| Power Input | AC Power cord | USB-C (60W fast charging) |
| Removable Battery | Yes | - |
| Stereo | Partially | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| USB Playback | Yes | Yes |
| Weight | 37.7 lbs (17.1 kg) | 24.3 lbs (11 kg) |
| Amplifier Power | 280W | 320W RMS / 500W Peak |
| Digital Aux Input | No | No |
| Lights | Yes | Yes |
| Wheels | Yes | - |
| Dimensions | 26.1”H x 13.1”W x 14.8”D (662.5 x 334 x 375 mm) | 23.4” x 9.8” x 12.3” (595 x 248 x 313 mm) |
| Strap | No | No |
| Battery Capacity | - | 45000mAh (Reviewer estimated) |
| MicroSD Playback | - | Yes |
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