Short answer: the Yeahbox Sonic Boom Ultra for better sound quality, the JBL Partybox On the Go for the lower price. The Yeahbox Sonic Boom Ultra ranks #10 of 75 boombox speakers at $349.20. The JBL Partybox On the Go ranks #46 at $300, $49.20 cheaper.
What the JBL Partybox On the Go offers: JBL Partybox On the Go uses 5.1” woofer + tweeters. Its 7.5 kg, claimed 6 hours (Manufacturer specified) battery life, IPX4 protection, aux input, up to 94dB and limited-stereo playback make it a practical option for its intended room or portable use. Watch for: Bass is limited by its 49Hz specification. No EQ adjustment.
What the Yeahbox Sonic Boom Ultra offers: 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. Watch for: 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.
Buy the JBL Partybox On the Go when the price outweighs sound quality for you, and the Yeahbox Sonic Boom Ultra when sound quality outweighs the price instead.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Specifications Side By Side
| JBL Partybox On the Go | Yeahbox Sonic Boom Ultra | |
|---|---|---|
| Price | $300 | $349.20 |
| Ranked | #46 of 75 in Boombox Size Portable Bluetooth Speakers | #10 of 75 in Boombox Size Portable Bluetooth Speakers |
| Aux Input | Yes | Yes |
| Bass Extension (-10dB) | 49Hz | - |
| Battery Life | 6 hours (Manufacturer specified) | - |
| IP Rating | IPX4 | IPX6 |
| Power Bank | Yes (USB-A, 5V/2.1A) | - |
| Stereo | Partially | Yes |
| Omnidirectional | No | No |
| USB Playback | Yes | Yes |
| Weight | 16.5 lbs (7.5 kg) | 24.3 lbs (11 kg) |
| Bluetooth Codecs | SBC | SBC (inferred; additional codecs unverified) |
| App | Yes (JBL PartyBox app) | Yes |
| EQ | No | Yes (Country, Classic, and custom app EQ; custom settings don't persist after the app closes) |
| TWS | Yes | Yes |
| Party Mode | No | No (TWS stereo pairing of 2 units only, no Auracast) |
| Built-in Microphone | No | - |
| Power Input | USB-C | USB-C (60W fast charging) |
| Bluetooth Version | 4.2 | 6.0 |
| Amplifier Power | 100W | 320W RMS / 500W Peak |
| Dimensions | 19.3" x 8.8" x 9.6" (489 x 224 x 244.5 mm) | 23.4" x 9.8" x 12.3" (595 x 248 x 313 mm) |
| Drivers | 5.1" woofer + tweeters | 6x9in racetrack woofer (200W) + 2x 4.5in midrange (40W each) + 2x tweeters (20W each), true 3-way |
| Maximum SPL | 94dB (Manufacturer specified) | - |
| Digital Aux Input | No | 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 |
| Lights | - | Yes |
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Prices on this page were last checked September 16, 2026 at 12:41 AM 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: $300 Amazon eBay
Pros: JBL Partybox On the Go uses 5.1” woofer + tweeters. Its 7.5 kg, claimed 6 hours (Manufacturer specified) battery life, IPX4 protection, aux input, up to 94dB and limited-stereo playback make it a practical option for its intended room or portable use. Measured bass extension of 49Hz (-10dB).
Cons: Bass is limited by its 49Hz specification. No EQ adjustment.
Full JBL Partybox On the Go review and specifications →
| Amplifier Power | 100W |
|---|---|
| App | Yes (JBL PartyBox app) |
| Aux Input | Yes |
| Bass Extension (-10dB) | 49Hz |
| Battery Life | 6 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 4.2 |
| Built-in Microphone | No |
| Digital Aux Input | No |
| Dimensions | 19.3" x 8.8" x 9.6" (489 x 224 x 244.5 mm) |
| Drivers | 5.1" woofer + tweeters |
| EQ | No |
| IP Rating | IPX4 |
| Maximum SPL | 94dB (Manufacturer specified) |
| Omnidirectional | No |
| Party Mode | No |
| Power Bank | Yes (USB-A, 5V/2.1A) |
| Power Input | USB-C |
| Stereo | Partially |
| TWS | Yes |
| USB Playback | Yes |
| Weight | 16.5 lbs (7.5 kg) |
- Links
- Reviews, Comparisons and Sound Samples
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Yeahbox Sonic Boom Ultra: $349.20 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) |
| 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 |
| 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 →
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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
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