Short answer: the Soundcore Select Pro. It ranks #15 of 77 large speakers by sound quality at $80; the Harman Kardon Onyx Studio 4 ranks #47 and costs $100, so there is not much of a tradeoff to weigh.
What the Soundcore Select Pro offers: Sounds almost exactly like the Motion Boom Watch for: Boosted bass, rolled off treble. 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 Select Pro. It ranks higher for sound quality than the Harman Kardon Onyx Studio 4 and costs less, which settles it without a real tradeoff to make.
There is a real battery-life gap here: the Soundcore Select Pro is rated for 16 hours, the Harman Kardon Onyx Studio 4 only 8 hours.
Water resistance is not close: the Soundcore Select Pro is rated at IPX7 (brief submersion), well ahead of the Harman Kardon Onyx Studio 4 at no water resistance.
Specifications Side By Side
| Soundcore Select Pro | Harman Kardon Onyx Studio 4 | |
|---|---|---|
| Price | $80 Discontinued | $100 Discontinued |
| Ranked | #15 of 77 in Large Size Portable Bluetooth Speakers | #47 of 77 in Large Size Portable Bluetooth Speakers |
| App | Yes (Users say it works) | Yes (HK Connect) |
| Aux Input | No | Yes |
| Battery Life | 16 hours (Manufacturer specified) | 8 hours (Manufacturer specified) |
| EQ | Yes | No |
| IP Rating | IPX7 | None |
| Party Mode | Yes (PartyCast up to 100 speakers) | Yes (Connect+ up to 100 speakers) |
| Power Bank | Yes | No |
| Power Input | USB-C | DC Barrel Connector (19V/2.1A) |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| TWS | No | 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 5.8" x 7.9" (346 x 148 x 200 mm) | 11.4" x 11.4" x 5.1" (290 x 290 x 130 mm) |
| Drivers | 2x 2.75" fullrange + 2x 2.5" passive radiators | 2x 75mm woofers, 2x 20mm tweeters |
| Output Power | 30W | 60W |
| Max Volume | 106dB | - |
| Digital Aux Input | No | No |
| Discontinued | Yes | Yes |
| Frequency Response | - | 50Hz - 20kHz (Manufacturer specified) |
Related Speaker Comparisons
Other pairings from the same speaker class worth checking:
- Soundcore Motion Boom vs W-King D9
- Soundcore Motion Boom vs Zealot S97
- Soundcore Rave Neo 2 vs Zealot S97
- Tribit Stormbox Lava vs Soundcore Select Pro
- Harman Kardon Onyx Studio 4 vs Soundcore Rave Neo
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 Select Pro: $80 Discontinued Amazon eBay
Pros: Sounds almost exactly like the Motion Boom
Cons: Boosted bass, rolled off treble. Not as neutral or detailed as other top ranked speakers. Discontinued.
Full Soundcore Select Pro review and specifications →
| App | Yes (Users say it works) |
|---|---|
| Aux Input | No |
| Battery Life | 16 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.0 |
| Built in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 13.6" x 5.8" x 7.9" (346 x 148 x 200 mm) |
| Discontinued | Yes |
| Drivers | 2x 2.75" fullrange + 2x 2.5" passive radiators |
| EQ | Yes |
| IP Rating | IPX7 |
| Max Volume | 106dB |
| Omnidirectional | No |
| Output Power | 30W |
| Party Mode | Yes (PartyCast up to 100 speakers) |
| Power Bank | Yes |
| Power Input | USB-C |
| Stereo | Yes |
| TWS | No |
| Weight | 3.3 lbs / 1.5 kg |
- Links
- Reviews, Comparisons and Sound Samples
- Snow Queen’s Tech: ANKER SOUNDCORE SELECT PRO VS MOTION BOOM - DO THEY SOUND THE SAME? SOUND TEST ( PLEASE WEAR 🎧)
- Chowa: Soundcore Select Pro (Review)
- Jay’s Straight Up Reviews & More: On a Ledge 🪟 Zealot S67 🆚 Soundcore Select Pro - Bluetooth Speaker Comparison More from JaysStraightUpReviews →
- Reddit Search for Soundcore Select Pro Review
- Head-to-Head Comparisons
- Soundcore Select Pro vs B&O Beoplay A2 active
- Soundcore Select Pro vs Soundcore Motion Boom
- Soundcore Select Pro vs Harman Kardon Citation 200
- Soundcore Select Pro vs Bose SoundLink Max
- Soundcore Select Pro vs JBL Xtreme 3
- Soundcore Select Pro vs Soundcore Motion X600
- Soundcore Select Pro vs Marshall Stockwell 2
- Soundcore Select Pro vs Soundcore Boom 2
- See all 37 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