Short answer: both are discontinued, so this only matters if you are buying used. Used, the Harman Kardon Go + Play 2 is the better pick: it ranks #23 of 113 boombox speakers by sound quality (rated 3.9/5), against #72 (rated 2.9/5) for the Soundcore Motion Boom+. If you want one new, the Harman Kardon Go + Play 3 replaces the Harman Kardon Go + Play 2 and is rated 4.4/5 at $385.
The Harman Kardon Go + Play 2 is the better-sounding, deeper-bass option. A stylish, light stereo speaker with good sound for moving from room to room. Its bass reaches about 40Hz before falling 10dB, against 52Hz for the Soundcore Motion Boom+. Watch for: Not as loud as others.
The Soundcore Motion Boom+ is the louder, longer-running choice. A rugged, waterproof stereo speaker that floats, with a 20 hour battery and app EQ. Alan Ross Reviews measured it at 108dB at full volume, against 99dB for the Harman Kardon Go + Play 2. It is rated for 20 hours of battery against 8 for the Harman Kardon Go + Play 2. It is rated IP67, while the Harman Kardon Go + Play 2 has no water resistance. Watch for: Default presets are all warm sounding with rolled off treble.
Buy the Harman Kardon Go + Play 2 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 Harman Kardon Go + Play 3, which replaces the Harman Kardon Go + Play 2.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Measured Differences
- Output: the Soundcore Motion Boom+ was measured at 108 dB maximum against 99 dB for the Harman Kardon Go + Play 2, so it gets clearly louder before it runs out of headroom.
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Specifications Side By Side
| Harman Kardon Go + Play 2 | Soundcore Motion Boom+ | |
|---|---|---|
| Price | $350 Discontinued | $122.42 after $40 coupon, Discontinued |
| Ranked | #23 of 113 in Boombox Size Portable Bluetooth Speakers | #72 of 113 in Boombox Size Portable Bluetooth Speakers |
| Aux Latency | 0ms | 17ms |
| Bass Extension (-10dB) | 40Hz | 52Hz |
| Battery Life | 8 hours (Manufacturer specified) | 20 hours (Manufacturer specified) |
| IP Rating | None | IP67 |
| Bluetooth Latency | 33ms | 33ms |
| Maximum SPL | 99dB (measured by Alan Ross Reviews) | 108dB (measured by Alan Ross Reviews) |
| Party Mode | Yes (Wireless Dual Sound) | Yes (PartyCast up to 100 speakers) |
| Power Input | AC Power brick | USB-C |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| App | No | Yes (Soundcore app) |
| EQ | No | Yes (App EQ) |
| TWS | No | Yes |
| Power Bank | No | Yes (USB-A, 5V/2.1A) |
| USB Playback | No | No |
| Built-in Microphone | Yes | No |
| Amplifier Power | 100W AC / 30W battery | 80W |
| Dimensions | 20” x 9” x 9.5” (508 x 228.6 x 241.3 mm) | 15.1” x 5.1” x 7.7” (384 x 130 x 196 mm) |
| Drivers | 2x 90mm (3.5”) woofers (front and rear firing) + 2x 20mm tweeters | 30W: Dual drivers |
| Weight | 5.3 lbs (2.4 kg) | 5.3 lbs (2.4 kg) |
| Digital Aux Input | No | No |
| Aux Input | Yes | Yes |
| Bluetooth Version | 4.1 | 5.3 |
| Strap | No | Yes (detachable strap) |
Watch Them Compared
Videos and reviews that test both speakers side by side.
Where the Ratings Come From
- Harman Kardon Go + Play 2: reviews by Alan Ross.
- Soundcore Motion Boom+: reviews by Joy & Oluv’Sone, Alan Ross and DLX Willington.
This comparison is generated from the ratings, specifications and measurements on each product’s own page, and it updates when that data changes. How we rank explains how each rating is decided.
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