Short answer: the Soundcore Motion Boom on measured sound quality, the Harman Kardon Onyx Studio 4 on price. The Soundcore Motion Boom ranks #14 of 77 large speakers at $109.99. The Harman Kardon Onyx Studio 4 ranks #47 at $100, $9.99 cheaper.
What the Soundcore Motion Boom offers: 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. Watch for: Not as neutral or detailed as other top ranked speakers
What the Harman Kardon Onyx Studio 4 offers: 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. Watch for: 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.
Buy the Soundcore Motion Boom when sound quality outweighs the price for you, and the Harman Kardon Onyx Studio 4 when the price outweighs sound quality instead.
If battery life is a priority, the Soundcore Motion Boom is rated for 24 hours versus 8 hours for the Harman Kardon Onyx Studio 4.
Water resistance is not close: the Soundcore Motion Boom is rated at IPX7 (brief submersion), well ahead of the Harman Kardon Onyx Studio 4 at no water resistance.
Specifications Side By Side
| Soundcore Motion Boom | Harman Kardon Onyx Studio 4 | |
|---|---|---|
| Price | $109.99 | $100 Discontinued |
| Ranked | #14 of 77 in Large Size Portable Bluetooth Speakers | #47 of 77 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 | - |
| Max Volume | 106dB | - |
| 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 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 |
| Output Power | 30W | 60W |
| Digital Aux Input | No | No |
| Frequency Response | - | 50Hz - 20kHz (Manufacturer specified) |
| Discontinued | - | Yes |
Related Speaker Comparisons
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- Harman Kardon Citation 200 vs Soundcore Select Pro
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- Harman Kardon Citation 200 vs Soundcore Rave Neo
- Tribit Stormbox Lava vs Soundcore Motion Boom
- Mifa Wildbox vs Soundcore Motion Boom
Prices on this page were last checked August 27, 2026 at 10:09 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 Amazon eBay
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.
Cons: Not as neutral or detailed as other top ranked speakers
Full Soundcore Motion Boom review and specifications →
| App | Yes |
|---|---|
| Aux Input | No |
| Bass Extension (-10dB) | 53Hz |
| Battery Life | 24 hours (Manufacturer specified) |
| 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 |
| Max Volume | 106dB |
| Omnidirectional | No |
| Output Power | 30W |
| 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: Soundcore Motion Boom vs JBL Xtreme 3 LG PN7 & Minirig mk3 💯👍
- 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: 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: 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: Soundcore Motion Boom vs W-King D8 and D9 - boom boom! 🥳
- Alan Ross Reviews: Doss Soundbox xl vs Soundcore Motion boom and Plus - woopeeeee!!!!!!!!
- Techder Audios: SONY XG300 VS SOUNDCORE MOTION BOOM More from techderaudios →
- Alan Ross Reviews: JBL Xtreme 3 vs Soundcore Motion Boom vs Rave Neo - Boombox Battle!
- Alan Ross Reviews: Soundcore Motion Boom vs W-King D8 and D9 - boom boom! 🥳
- Alan Ross Reviews: HK Go+ Play vs Soundcore Motion Boom - biggest bass battle ever!!!!!!!!!!!!
- Jagist reviews: Soundcore Motion Boom vs Altec Lansing Mix 2.0 More from Jagistreviews →
- Reddit Search for Soundcore Motion Boom Review
- 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 2
- 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 43 comparisons
Harman Kardon Onyx Studio 4: $100 Discontinued eBay
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 →
| App | Yes (HK Connect) |
|---|---|
| Aux Input | Yes |
| Battery Life | 8 hours (Manufacturer specified) |
| 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) |
| Discontinued | Yes |
| Drivers | 2x 75mm woofers, 2x 20mm tweeters |
| EQ | No |
| Frequency Response | 50Hz - 20kHz (Manufacturer specified) |
| IP Rating | None |
| Omnidirectional | No |
| Output Power | 60W |
| Party Mode | Yes (Connect+ up to 100 speakers) |
| Power Bank | No |
| Power Input | DC Barrel Connector (19V/2.1A) |
| Stereo | Yes |
| TWS | Yes |
| Weight | 4.5 lbs / 2.06 kg |
- Links
- Reviews, Comparisons and Sound Samples
- Geri’s Collection: Harman Kardon Onyx 7 vs Onyx 4
- OCM Reviews: Onyx Studio 4 Vs Onyx Studio 5 - Sound Quality Comparison - Bluetooth Speaker
- Alan Ross Reviews: Ultimate HK Onyx Studio speaker review and comparison! 8 speakers! More from alanrossreviews →
- Reddit Search for Harman Kardon Onyx Studio 4 Review
- Head-to-Head Comparisons
- Harman Kardon Onyx Studio 4 vs Zealot S97
- Harman Kardon Onyx Studio 4 vs JBL Xtreme 2
- Harman Kardon Onyx Studio 4 vs Tronsmart Halo 100
- Harman Kardon Onyx Studio 4 vs W-King D8
- Harman Kardon Onyx Studio 4 vs Sony SRS-XB43
- Harman Kardon Onyx Studio 4 vs JBL Xtreme
- Harman Kardon Onyx Studio 4 vs Doss Soundbox XL
- Harman Kardon Onyx Studio 4 vs Sony ULT Field 5
- See all 38 comparisons