Short answer: both are discontinued, so this only matters if you are buying used. Used, the Soundcore Select Pro is the better pick: it ranks #15 of 105 large speakers by sound quality (rated 4.4/5), against #67 (rated 3.3/5) for the Harman Kardon Onyx Studio 4. If you want one new, the Tribit Stormbox Lava ranks #3 at $119.99. The Harman Kardon Onyx Studio 4 has been replaced by the Harman Kardon Onyx Studio 9.
The Soundcore Select Pro is the better-sounding, longer-running option. A tough 3.3 lbs (1.5 kg) speaker with IPX7 protection, app EQ, a claimed 16-hour battery life, USB-C charging, power-bank output and PartyCast for linking up to 100 compatible speakers. It is rated for 16 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. The tradeoff: Independent lab listening finds only fair music fidelity: bass is somewhat boomy and lacks deep extension, mids can sound nasal and congested, and treble becomes smeared or sizzly.
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 Select Pro lacks. The catch: 8 hour battery at medium volume.
Buy the Soundcore Select Pro 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, start with the Tribit Stormbox Lava instead.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Specifications Side By Side
| Soundcore Select Pro | Harman Kardon Onyx Studio 4 | |
|---|---|---|
| Price | $80 Discontinued | $100 Discontinued |
| Ranked | #15 of 105 in Large Size Portable Bluetooth Speakers | #67 of 105 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 | Yes | Yes |
| 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 + 1x passive radiator |
| Amplifier Power | 30W | 60W |
| Maximum SPL | 106dB (measured by Alan Ross Reviews) | - |
| Digital Aux Input | No | No |
| Frequency Response | - | 50Hz - 20kHz (Manufacturer specified) |
| Strap | - | No |
Related Speaker Comparisons
More worthwhile head-to-heads for Soundcore Select Pro:
- JBL Xtreme 5 vs Soundcore Select Pro
- Tribit Stormbox Lava vs Soundcore Select Pro
- Soundcore Boom 2 vs Soundcore Select Pro
- Marshall Stockwell II vs Soundcore Select Pro
- Harman Kardon Citation 200 vs Soundcore Select Pro
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 Select Pro: $80 Discontinued eBay
Pros: A tough 1.5kg speaker with IPX7 protection, app EQ, a claimed 16-hour battery life, USB-C charging, power-bank output and PartyCast for linking up to 100 compatible speakers. It reaches a useful 106dB maximum level and offers a lively, bass-forward sound for casual outdoor use.
Cons: Independent lab listening finds only fair music fidelity: bass is somewhat boomy and lacks deep extension, mids can sound nasal and congested, and treble becomes smeared or sizzly. It strains at high volume, lacks an aux input and is discontinued, so it is best chosen for features and durability rather than detail or neutral sound.
Full Soundcore Select Pro review and specifications →
| Released | May 2021 (5 years ago) |
|---|---|
| Amplifier Power | 30W |
| App | Yes (Users say it works) |
| Aux Input | No |
| Battery Life | 16 hours (Manufacturer specified) |
| Bluetooth | Yes |
| 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) |
| Drivers | 2x 2.75” fullrange + 2x 2.5” passive radiators |
| EQ | Yes |
| IP Rating | IPX7 |
| Maximum SPL | 106dB (measured by Alan Ross Reviews) |
| Omnidirectional | No |
| 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
- Alan Ross Reviews: This is shocking! They broke the world pound for pound champ! 😢 More from alanrossreviews →
- Jay’s Straight Up Reviews & More: On a Ledge 🪟 Zealot S67 🆚 Soundcore Select Pro - Bluetooth Speaker Comparison More from JaysStraightUpReviews →
- Chowa: Soundcore Select Pro (Review)
- 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 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 II
- Soundcore Select Pro vs Soundcore Boom 2
- See all 38 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