Short answer: the JBL PartyBox On-The-Go 2 Plus. It ranks #5 of 91 boombox speakers by sound quality, rated 4.4/5, at $349.95; the Yeahbox Sonic Boom Ultra ranks #11, rated 4.2/5, and costs $388, so there is little reason to consider the other one.
The JBL PartyBox On-The-Go 2 Plus is the lighter choice. Well balanced with strong vocals, and its front-firing bass ports give it cleaner, smoother bass than other PartyBoxes, so even the Punchy bass boost setting never overpowers the vocals. At 14.2 lbs (6.45 kg) it weighs much less than the Yeahbox Sonic Boom Ultra at 24.3 lbs (11 kg). It links with other speakers (Auracast), which the Yeahbox Sonic Boom Ultra cannot. The tradeoff: The bass has less kick and physical impact than the Encore 2 or PartyBox Club 120, and the Club 120 gets noticeably louder.
The Yeahbox Sonic Boom Ultra is the longer-running, tougher option. By far the loudest boombox tested against it, hitting 106-107dB, roughly 3-5dB louder than the JBL Boombox 4, Zealot ZE41, Tribit Stormbox Blast 2, W-King X20, and Hopestar A90/A95. It is rated for 24 hours of battery against 15 for the JBL PartyBox On-The-Go 2 Plus. It is rated IPX6 against IPX4 for the JBL PartyBox On-The-Go 2 Plus. The catch: The 500W peak-power rating doesn’t fully hold up: it gets noisy above roughly 80-90% volume, and the midrange isn’t fully refined, sometimes sitting a touch too forward.
Buy the JBL PartyBox On-The-Go 2 Plus. It is rated higher for sound quality than the Yeahbox Sonic Boom Ultra and costs less, so only choose the other one for a particular feature it does better.
Want more options? Browse the full Portable Bluetooth rankings.
Specifications Side By Side
| JBL PartyBox On-The-Go 2 Plus | Yeahbox Sonic Boom Ultra | |
|---|---|---|
| Price | $349.95 | $388.00 |
| Ranked | #5 of 91 in Boombox Size Portable Bluetooth Speakers | #11 of 91 in Boombox Size Portable Bluetooth Speakers |
| App | Yes (JBL One app) | Yes |
| Aux Input | Yes | Yes |
| Battery Life | 15 hours (Manufacturer specified) | 24 hours (Manufacturer specified) |
| Built-in Microphone | No | - |
| EQ | Yes (app EQ, Deep and Punchy bass boost) | Yes (Country, Classic, and custom app EQ; custom settings don’t persist after the app closes) |
| IP Rating | IPX4 | IPX6 |
| Party Mode | Yes (Auracast) | No (TWS stereo pairing of 2 units only, no Auracast) |
| Power Bank | Yes (USB-C, 11V/2A) | - |
| 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 | 14.2 lbs (6.45 kg) | 24.3 lbs (11 kg) |
| Wireless Microphones | Yes 1 Included | - |
| Microphone Input | No (wireless only) | - |
| Guitar Input | No | - |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC, LC3 | SBC (inferred; additional codecs unverified) |
| Bluetooth Version | 5.4 | 6.0 |
| Amplifier Power | 100W RMS | 320W RMS / 500W Peak |
| Dimensions | 19.7” x 10.2” x 8.7” (501 x 258 x 221 mm) | 23.4” x 9.8” x 12.3” (595 x 248 x 313 mm) |
| Drivers | 1x 135mm (5.25”) woofer + 2x 20mm (0.75”) dome tweeters | 6x9in racetrack woofer (200W) + 2x 4.5in midrange (40W each) + 2x tweeters (20W each), true 3-way |
| Frequency Response | 40Hz - 20kHz (-6dB, Manufacturer specified) | - |
| Digital Aux Input | Yes (USB-C) | No |
| Lights | Yes | Yes |
| Strap | Yes (detachable shoulder strap) | No |
| Battery Capacity | - | 45000mAh (Reviewer estimated) |
| Inputs | - | HDMI ARC (in/out, usable as a TV soundbar), AUX in/out, USB drive, microSD, optional wired mic |
| MicroSD Playback | - | Yes |
Related Speaker Comparisons
More top alternatives to JBL PartyBox On-The-Go 2 Plus:
- Tribit Stormbox Blast vs JBL PartyBox On-The-Go 2 Plus
- JBL Partybox Encore 2 vs JBL PartyBox On-The-Go 2 Plus
- JBL PartyBox On-The-Go 2 Plus vs JBL Partybox Encore Essential 2
- JBL PartyBox On-The-Go 2 Plus vs JBL Partybox Encore
- JBL PartyBox On-The-Go 2 Plus vs JBL Partybox Encore Essential
Prices on this page were last checked October 4, 2026 at 9:58 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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The Two Speakers In Full
JBL PartyBox On-The-Go 2 Plus: $349.95 Amazon eBay
Older model: the JBL Partybox On the Go (ranked lower, rated 3/5).
Pros: Well balanced with strong vocals, and its front-firing bass ports give it cleaner, smoother bass than other PartyBoxes, so even the Punchy bass boost setting never overpowers the vocals. It gets a touch louder than the PartyBox Encore 2. EasySing AI vocal removal strips vocals from any song on the speaker itself, with 25%, 50% or 100% removal, and the included rechargeable wireless mic has a tight pickup pattern that rejects handling noise. A removable 34Wh battery shared with the Encore 2 and PartyBox 120, a claimed 15 hours, a padded shoulder strap, USB-C playback and charging, a 3.5mm aux input, Auracast and a light show.
Cons: The bass has less kick and physical impact than the Encore 2 or PartyBox Club 120, and the Club 120 gets noticeably louder. There is no wired microphone or guitar input, so more mics means buying JBL’s EasySing mics separately, and AI vocal removal is disabled while the speaker is linked to other speakers over Auracast. Real world battery life is closer to 7 hours at 80% volume with lights and bass boost on. IPX4 only covers splashes, the grille dents easily, and the battery must be installed for it to run even when plugged in.
Full JBL PartyBox On-The-Go 2 Plus review and specifications →
| Amplifier Power | 100W RMS |
|---|---|
| App | Yes (JBL One app) |
| Aux Input | Yes |
| Battery Life | 15 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC, LC3 |
| Bluetooth Version | 5.4 |
| Built-in Microphone | No |
| Digital Aux Input | Yes (USB-C) |
| Dimensions | 19.7” x 10.2” x 8.7” (501 x 258 x 221 mm) |
| Drivers | 1x 135mm (5.25”) woofer + 2x 20mm (0.75”) dome tweeters |
| EQ | Yes (app EQ, Deep and Punchy bass boost) |
| Frequency Response | 40Hz - 20kHz (-6dB, Manufacturer specified) |
| Guitar Input | No |
| IP Rating | IPX4 |
| Lights | Yes |
| Microphone Input | No (wireless only) |
| Omnidirectional | No |
| Party Mode | Yes (Auracast) |
| Power Bank | Yes (USB-C, 11V/2A) |
| Power Input | AC Power cord |
| Removable Battery | Yes |
| Stereo | Partially |
| Strap | Yes (detachable shoulder strap) |
| TWS | Yes |
| USB Playback | Yes |
| Weight | 14.2 lbs (6.45 kg) |
| Wireless Microphones | Yes 1 Included |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- JBL PartyBox On-The-Go 2 Plus vs JBL Partybox Encore 2
- JBL PartyBox On-The-Go 2 Plus vs JBL Partybox Encore Essential 2
- JBL PartyBox On-The-Go 2 Plus vs JBL Partybox Encore
- JBL PartyBox On-The-Go 2 Plus vs JBL Partybox Encore Essential
- JBL PartyBox On-The-Go 2 Plus vs Tribit Stormbox Blast
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Yeahbox Sonic Boom Ultra: $388.00 Amazon eBay
Pros: By far the loudest boombox tested against it, hitting 106-107dB, roughly 3-5dB louder than the JBL Boombox 4, Zealot ZE41, Tribit Stormbox Blast 2, W-King X20, and Hopestar A90/A95. The massive 6x9in racetrack woofer reaches audible bass down to around 30Hz on the Country EQ preset, and a teardown confirmed genuinely robust internals: a thick vented voice coil and a dedicated crossover output per driver. HDMI ARC input/output lets it double as a TV soundbar, a feature none of its direct competitors offer.
Cons: The 500W peak-power rating doesn’t fully hold up: it gets noisy above roughly 80-90% volume, and the midrange isn’t fully refined, sometimes sitting a touch too forward. The custom EQ in the app noticeably reduces bass output compared to the factory presets and doesn’t persist after the speaker powers off. No Auracast, no removable battery, a plastic handle with some flex, and heavy at 11kg (24lb) for $388. Most of the sound-quality coverage comes from enthusiast listening-test comparisons rather than independent measurement.
Full Yeahbox Sonic Boom Ultra review and specifications →
| Amplifier Power | 320W RMS / 500W Peak |
|---|---|
| App | Yes |
| Aux Input | Yes |
| Battery Capacity | 45000mAh (Reviewer estimated) |
| Battery Life | 24 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC (inferred; additional codecs unverified) |
| Bluetooth Version | 6.0 |
| Digital Aux Input | No |
| Dimensions | 23.4” x 9.8” x 12.3” (595 x 248 x 313 mm) |
| Drivers | 6x9in racetrack woofer (200W) + 2x 4.5in midrange (40W each) + 2x tweeters (20W each), true 3-way |
| EQ | Yes (Country, Classic, and custom app EQ; custom settings don’t persist after the app closes) |
| IP Rating | IPX6 |
| Inputs | HDMI ARC (in/out, usable as a TV soundbar), AUX in/out, USB drive, microSD, optional wired mic |
| Lights | Yes |
| MicroSD Playback | Yes |
| Omnidirectional | No |
| Party Mode | No (TWS stereo pairing of 2 units only, no Auracast) |
| Power Input | USB-C (60W fast charging) |
| Stereo | Yes |
| Strap | No |
| TWS | Yes |
| USB Playback | Yes |
| Weight | 24.3 lbs (11 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Jagist reviews: Yeahbox Sonic Boom Ultra Vs Zealot Ze41!!! Battle Of Big Boys!!! 😜😜😜 More from Jagistreviews →
- Jagist reviews: Yeahbox Sonic Boom Ultra Vs Zealot Ze21!!! Battle Of The Deep Bass 🥳🥳🥳
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- Techder Audios: YEAHBOX Sonic Boom Ultra VS JBL Boombox 4 "IT BEATS THE KING!?😈😱" More from techderaudios →
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- Jagist reviews: Yeahbox Sonic Boom Ultra!!! 💥 Unboxing And Review!!! Absolutely A Beast 💯 🥵🥵🥵
- Techder Audios: YEAHBOX Sonic Boom Ultra - Soundtest "DEEP SUBWOOFER LIKE PERFORMANCE!🔥"
- Audio y Mas: El Woofer Más GRANDE en un Altavoz, Yeahbox Sonic Boom Ultra
- Jagist reviews: Yeahbox Sonic Boom Ultra Bass Test!!! What A Beast!!! 😍😍😍
- brett levesque: Yeahbox sonic boom ultra hertz test
- Jagist reviews: Yeahbox Sonic Boom Ultra Hertz Test!!! How Low Will She Go??? 😛😛😛
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