Short answer: the Yeahbox Sonic Boom Ultra. It ranks #11 of 76 boombox speakers by sound quality, rated 4.2/5, at $388; the Bumpboxx Flare 8 ranks #58, rated 2.6/5, and costs $400, so there is not much of a tradeoff to weigh.
Why pick the Yeahbox Sonic Boom Ultra: 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 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.
Why pick the Bumpboxx Flare 8: A retro-styled, 8.6kg party speaker with useful real-world features: IPX6 splash resistance, FM radio, USB and microSD playback, aux input, TWS pairing and a claimed 118dB maximum output. The tradeoff: Bass is thuddy rather than deep or controlled, and there is no app to improve the tuning.
Buy the Yeahbox Sonic Boom Ultra. It is rated higher for sound quality than the Bumpboxx Flare 8 and costs less, so it is the default pick unless a specific strength of the other one matters more to you.
If battery life is a priority, the Yeahbox Sonic Boom Ultra is rated for 24 hours versus 12 hours for the Bumpboxx Flare 8.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Specifications Side By Side
| Yeahbox Sonic Boom Ultra | Bumpboxx Flare 8 | |
|---|---|---|
| Price | $388.00 | $400 |
| Ranked | #11 of 76 in Boombox Size Portable Bluetooth Speakers | #58 of 76 in Boombox Size Portable Bluetooth Speakers |
| App | Yes | No |
| Aux Input | Yes | Yes |
| Battery Capacity | 45000mAh (Reviewer estimated) | - |
| Bluetooth Version | 6.0 | - |
| Dimensions | 23.4” x 9.8” x 12.3” (595 x 248 x 313 mm) | 28” x 8” x 16” (711 x 203 x 406 mm) |
| Drivers | 6x9in racetrack woofer (200W) + 2x 4.5in midrange (40W each) + 2x tweeters (20W each), true 3-way | 8” woofer + tweeters |
| EQ | Yes (Country, Classic, and custom app EQ; custom settings don’t persist after the app closes) | Yes |
| Inputs | HDMI ARC (in/out, usable as a TV soundbar), AUX in/out, USB drive, microSD, optional wired mic | - |
| IP Rating | IPX6 | IPX6 |
| MicroSD Playback | Yes | Yes |
| Amplifier Power | 320W RMS / 500W Peak | 200W |
| Party Mode | No (TWS stereo pairing of 2 units only, no Auracast) | No |
| Power Input | USB-C (60W fast charging) | USB-C |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| USB Playback | Yes | Yes |
| Weight | 24.3 lbs (11 kg) | 19 lbs (8.62 kg) |
| Digital Aux Input | No | No |
| Bluetooth Codecs | SBC (inferred; additional codecs unverified) | SBC |
| Lights | Yes | Yes |
| Battery Life | 24 hours (Manufacturer specified) | 12 hours (Manufacturer specified) |
| Strap | No | - |
| Power Bank | - | No |
| Built-in Microphone | - | No |
| FM Tuner | - | Yes |
| Maximum SPL | - | 118dB (Manufacturer specified) |
Related Speaker Comparisons
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- JBL Partybox Encore 2 vs Yeahbox Sonic Boom Ultra
- JBL Partybox Encore Essential 2 vs Yeahbox Sonic Boom Ultra
- Yeahbox Sonic Boom Ultra vs JBL Partybox Encore
- JBL Partybox Encore Essential vs Yeahbox Sonic Boom Ultra
Prices on this page were last checked September 26, 2026 at 11:14 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
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 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 🥳🥳🥳
- Jagist reviews: Yeahbox Sonic Boom Ultra Vs W-king X20!!! Old Vs New!!! 🫨🫨🫨
- Techder Audios: YEAHBOX Sonic Boom Ultra VS JBL Boombox 4 "IT BEATS THE KING!?😈😱" More from techderaudios →
- Jagist reviews: Yeahbox Sonic Boom Ultra Vs Tribit Stormbox Blast 2 Firmware 11!!! Holy Crap!!! 🤩🤩🤩
- Jagist reviews: Yeahbox Sonic Boom Ultra Vs Hopestar A95!!! Battle Of Big Boys!!!! 😘😘😘
- 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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Bumpboxx Flare 8: $400 Bumpboxx eBay
Pros: A retro-styled, 8.6kg party speaker with useful real-world features: IPX6 splash resistance, FM radio, USB and microSD playback, aux input, TWS pairing and a claimed 118dB maximum output. It can play much louder than compact Bluetooth speakers and is easy to aim at a small outdoor gathering.
Cons: Bass is thuddy rather than deep or controlled, and there is no app to improve the tuning. Owner reports also raise reliability concerns, including noisy or intermittent volume controls and sound cutting out at high volume. It is a fun-looking niche product, not a sound-quality or durability leader.
Full Bumpboxx Flare 8 review and specifications →
| Amplifier Power | 200W |
|---|---|
| App | No |
| Aux Input | Yes |
| Battery Life | 12 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Built-in Microphone | No |
| Digital Aux Input | No |
| Dimensions | 28” x 8” x 16” (711 x 203 x 406 mm) |
| Drivers | 8” woofer + tweeters |
| EQ | Yes |
| FM Tuner | Yes |
| IP Rating | IPX6 |
| Lights | Yes |
| Maximum SPL | 118dB (Manufacturer specified) |
| MicroSD Playback | Yes |
| Omnidirectional | No |
| Party Mode | No |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | Yes |
| TWS | Yes |
| USB Playback | Yes |
| Weight | 19 lbs (8.62 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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