Short answer: both are discontinued, so this only matters if you are buying used. Used, the Soundcore Motion Boom is the better pick: it ranks #14 of 105 large speakers by sound quality (rated 4.5/5), against #67 (rated 3.3/5) for the Harman Kardon Onyx Studio 4. If you want one new, the Soundcore Boom 2 replaces the Soundcore Motion Boom and is rated 4.5/5 at $99.99.
The Soundcore Motion Boom is the better-sounding, longer-running option. 30W loud bass-heavy sound, excellent budget-friendly value. It is rated for 24 hours of battery against 8 for the Harman Kardon Onyx Studio 4. At 3.3 lbs (1.5 kg) it weighs noticeably less than the Harman Kardon Onyx Studio 4 at 4.5 lbs (2.06 kg). It is rated IPX7, while the Harman Kardon Onyx Studio 4 has no water resistance. Watch for: Not as neutral or detailed as other top ranked speakers.
The case for the Harman Kardon Onyx Studio 4: Balanced sound quality with deep resonant bass and crisp treble, large dynamic range. It keeps a wired aux input, which the Soundcore Motion Boom lacks. It links with other speakers (Connect+ up to 100 speakers), which the Soundcore Motion Boom cannot. The catch: 8 hour battery at medium volume.
Buy the Soundcore Motion Boom only if you find one used in good condition; both are discontinued, and it is the better rated of the two. For a new speaker, buy the Soundcore Boom 2, which replaces the Soundcore Motion Boom.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Specifications Side By Side
| Soundcore Motion Boom | Harman Kardon Onyx Studio 4 | |
|---|---|---|
| Price | $109.99 Discontinued | $100 Discontinued |
| Ranked | #14 of 105 in Large Size Portable Bluetooth Speakers | #67 of 105 in Large Size Portable Bluetooth Speakers |
| App | Yes | Yes (HK Connect) |
| Aux Input | No | Yes |
| Bass Extension (-10dB) | 53Hz | - |
| Battery Life | 24 hours (Manufacturer specified) | 8 hours (Manufacturer specified) |
| EQ | Yes | No |
| IP Rating | IPX7 | None |
| Bluetooth Latency | 170ms | - |
| Maximum SPL | 106dB (measured by Alan Ross Reviews) | - |
| Party Mode | No | Yes (Connect+ up to 100 speakers) |
| Power Bank | Yes (USB-A) | No |
| Power Input | USB-C | DC Barrel Connector (19V/2.1A) |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 3.3 lbs (1.5 kg) | 4.5 lbs (2.06 kg) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| Built-in Microphone | Yes | Yes |
| Bluetooth Version | 5.0 | 4.2 |
| Dimensions | 13.6” x 7.9” x 5.8” (346 x 200 x 148 mm) | 11.4” x 11.4” x 5.1” (290 x 290 x 130 mm) |
| Drivers | 2x 63.5mm titanium fullrange drivers + 2x passive radiators | 2x 75mm woofers + 2x 20mm tweeters + 1x passive radiator |
| Amplifier Power | 30W | 60W |
| Digital Aux Input | No | No |
| Frequency Response | - | 50Hz - 20kHz (Manufacturer specified) |
| Strap | - | No |
Related Speaker Comparisons
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- Soundcore Motion Boom vs Vifa Helsinki
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- Soundcore Motion Boom vs Brane X
- Soundcore Motion Boom vs Minirig 4 with subwoofer
Prices on this page were last checked October 12, 2026 at 4:13 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
Soundcore Motion Boom: $109.99 Discontinued Amazon $109.99 eBay
Newer model: the Soundcore Boom 2, ranked higher, rated 4.5/5, released Mar 2024. It adds party mode, but drops the built-in mic. See every Soundcore Boom generation.
Pros: 30W loud bass-heavy sound, excellent budget-friendly value. 10,000mAh battery for 24 hours claimed (15-18 hours with BassUp engaged at high volume). Waterproof, buoyant design, convenient carry handle. PowerIQ USB port charges devices. BassUp feature works well with clear mids/highs. Measured bass extension of 53Hz (-10dB).
Cons: Not as neutral or detailed as other top ranked speakers. Discontinued.
Full Soundcore Motion Boom review and specifications →
| Released | Dec 2020 (5 years ago) |
|---|---|
| Amplifier Power | 30W |
| App | Yes |
| Aux Input | No |
| Bass Extension (-10dB) | 53Hz |
| Battery Life | 24 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| Bluetooth Latency | 170ms |
| Bluetooth Version | 5.0 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 13.6” x 7.9” x 5.8” (346 x 200 x 148 mm) |
| Drivers | 2x 63.5mm titanium fullrange drivers + 2x passive radiators |
| EQ | Yes |
| IP Rating | IPX7 |
| Maximum SPL | 106dB (measured by Alan Ross Reviews) |
| Omnidirectional | No |
| Party Mode | No |
| Power Bank | Yes (USB-A) |
| Power Input | USB-C |
| Stereo | Yes |
| TWS | Yes |
| Weight | 3.3 lbs (1.5 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Alan Ross Reviews: This is shocking! They broke the world pound for pound champ! 😢 More from alanrossreviews →
- Alan Ross Reviews: Mifa Wildbox vs Soundcore Motion Boom Review! its a close one! 💯
- Alan Ross Reviews: Minirig mk3 2.2 (2x subwoofers) vs 2x Soundcore Motion Booms 🤑
- Alan Ross Reviews: W-King X10 (70w) vs Soundcore Motion Boom (30w) - value for money? 🤑
- Alan Ross Reviews: Ultimate Soundcore Boom 2 Review - Is It Worth The Hype?
- Alan Ross Reviews: Dockin D Fine+ 2 vs Soundcore Motion Boom 50w vs 30w 😱
- Alan Ross Reviews: W-King T9 or Soundcore Motion Boom - King vs World Champion! 👌
- Alan Ross Reviews: Doss Soundbox xl vs Soundcore Motion boom and Plus - woopeeeee!!!!!!!!
- Alan Ross Reviews: HK Go+ Play vs Soundcore Motion Boom - biggest bass battle ever!!!!!!!!!!!!
- Alan Ross Reviews: Tribit Stormbox Blast compared to the 2022 StormBox Blast, i wasn’t expecting this!
- Alan Ross Reviews: 2x Soundcore Boost (stereo) vs Motion Boom and Motion+ - Best Soundcore speaker? 😋
- Alan Ross Reviews: Marshall Stockwell 2 vs Soundcore Motion Boom and Motion Plus! expensive is better?
- Alan Ross Reviews: Soundcore Motion Boom vs W-King D8 and D9 - boom boom! 🥳
- Alan Ross Reviews: JBL Xtreme 3 vs Soundcore Motion Boom vs Rave Neo - Boombox Battle!
- Alan Ross Reviews: Soundcore Motion Boom vs JBL Xtreme 3 LG PN7 & Minirig mk3 💯👍
- Alan Ross Reviews: Soundcore Motion x600 (best speaker ever) or two motion booms?
- Alan Ross Reviews: Longest I have ever been, and I don’t care who sees it! ❤
- Alan Ross Reviews: Tribit Stormbox Blast or two Motion Boom Pluses for best cheap boombox?
- Techder Audios: SONY XG300 VS SOUNDCORE MOTION BOOM More from techderaudios →
- Jagist reviews: Soundcore Motion Boom vs Altec Lansing Mix 2.0 More from Jagistreviews →
- CEONTHEMAKING: Soundcore Boom 2 - HANDS DOWN The Best Speaker Under $150! More from CEONTHEMAKING →
- Snow Queen’s Tech: ANKER SOUNDCORE SELECT PRO VS MOTION BOOM - DO THEY SOUND THE SAME? SOUND TEST ( PLEASE WEAR 🎧)
- Head-to-Head Comparisons
- Soundcore Motion Boom vs Harman Kardon Citation 200
- Soundcore Motion Boom vs Soundcore Select Pro
- Soundcore Motion Boom vs B&O Beoplay A2 active
- Soundcore Motion Boom vs Marshall Stockwell II
- Soundcore Motion Boom vs Bose SoundLink Max
- Soundcore Motion Boom vs JBL Xtreme 3
- Soundcore Motion Boom vs Soundcore Boom 2
- Soundcore Motion Boom vs Mifa Wildbox
- See all 56 comparisons
Harman Kardon Onyx Studio 4: $100 Discontinued eBay
Newer model: the Harman Kardon Onyx Studio 9, rated 4.1/5, released Dec 2024. See every Harman Kardon Onyx Studio generation.
Pros: Balanced sound quality with deep resonant bass and crisp treble, large dynamic range. Multi-host Bluetooth connectivity for 2 phones, daisy chaining up to 100 speakers. Elegant modern design with smooth curves and premium materials.
Cons: 8 hour battery at medium volume. Not at loud as others. Not as deep of bass as the newer Onyx. External AC power brick for charging. Discontinued.
Full Harman Kardon Onyx Studio 4 review and specifications →
| Released | Aug 2017 (9 years ago) |
|---|---|
| Amplifier Power | 60W |
| App | Yes (HK Connect) |
| Aux Input | Yes |
| Battery Life | 8 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 4.2 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 11.4” x 11.4” x 5.1” (290 x 290 x 130 mm) |
| Drivers | 2x 75mm woofers + 2x 20mm tweeters + 1x passive radiator |
| EQ | No |
| Frequency Response | 50Hz - 20kHz (Manufacturer specified) |
| IP Rating | None |
| Omnidirectional | No |
| Party Mode | Yes (Connect+ up to 100 speakers) |
| Power Bank | No |
| Power Input | DC Barrel Connector (19V/2.1A) |
| Stereo | Yes |
| Strap | No |
| TWS | Yes |
| Weight | 4.5 lbs (2.06 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Harman Kardon Onyx Studio 4 vs Tronsmart Halo 100
- Harman Kardon Onyx Studio 4 vs Zealot S97
- Harman Kardon Onyx Studio 4 vs JBL Xtreme
- Harman Kardon Onyx Studio 4 vs JBL Xtreme 2
- Harman Kardon Onyx Studio 4 vs DOSS Soundbox XL
- Harman Kardon Onyx Studio 4 vs Klipsch Detroit
- Harman Kardon Onyx Studio 4 vs Sony SRS-XG300
- Harman Kardon Onyx Studio 4 vs W-King D8
- See all 47 comparisons