These sit in different size classes, so this is not a straight ranking comparison. The Brane X ranks #4 of 114 large speakers by sound quality at $549; the Harman Kardon Go + Play 3 ranks #3 of 111 boombox speakers by sound quality at $385.
The Brane X is the louder, longer-running option. A portable speaker with extraordinarily deep bass for its size, plus Wi-Fi, AirPlay, Alexa and a low latency aux input. Alan Ross Reviews measured it at 106dB at full volume, against 103dB for the Harman Kardon Go + Play 3. It is rated for 12 hours of battery against 8 for the Harman Kardon Go + Play 3. At 7.7 lbs (3.5 kg) it weighs noticeably less than the Harman Kardon Go + Play 3 at 10.4 lbs (4.7 kg). Watch for: The front-facing design has only moderate dispersion, so sound changes noticeably off to the sides or behind it.
What the Harman Kardon Go + Play 3 does well: A stylish stereo boombox with very deep bass for its size and warm sound, made for indoor use. The catch: Just a little over half as loud as the higher rated boomboxes.
Buy the Brane X ($549) for a large speaker; the Harman Kardon Go + Play 3 ($385) suits a boombox speaker instead.
There is a real gap in water resistance: the Brane X at IP57 (brief submersion) against the Harman Kardon Go + Play 3, which has no water resistance.
Looking for alternatives? See the complete Portable Bluetooth rankings.
A portable speaker with extraordinarily deep bass for its size, plus Wi-Fi, AirPlay, Alexa and a low latency aux input.
A stylish stereo boombox with very deep bass for its size and warm sound, made for indoor use.
Prices on this page were last checked October 26, 2026 at 12:00 AM 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.
As an eBay Partner, we may be compensated if you make a purchase.
Specifications Side By Side
| Brane X | Harman Kardon Go + Play 3 | |
|---|---|---|
| Price | $549.00 | $385 |
| Ranked | #4 of 114 in Large Size Portable Bluetooth Speakers | #3 of 111 in Boombox Size Portable Bluetooth Speakers |
| Aux Input | Yes | Yes |
| Aux Latency | 295ms default, 33ms with aux pass-through | 112ms |
| Bass Extension (-10dB) | 31Hz | 35Hz |
| Battery Life | 12 hours (Manufacturer specified) | 8 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | aptX HD, aptX, AAC, SBC | SBC, AAC |
| IP Rating | IP57 | None |
| Bluetooth Latency | 100ms | 120ms |
| Maximum SPL | 106dB (measured by Alan Ross Reviews) | 103dB (measured by Alan Ross Reviews) |
| Party Mode | Yes (Brane app, up to 8 speakers) | No |
| Power Input | AC Power brick | AC Power brick |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 7.7 lbs (3.5 kg) | 10.4 lbs (4.7 kg) |
| Wi-Fi | Yes | - |
| App | Yes (Brane app) | Yes (Harman Kardon One app) |
| Built-in Microphone | Yes | Yes |
| Voice Assistants | Amazon Alexa | - |
| EQ | Yes (5 band) | Yes (App EQ) |
| Power Bank | No | Yes |
| Dimensions | 9.3” x 7” x 6.1” (236 x 178 x 155 mm) | 17.3” x 9.4” x 7.6” (439 x 240 x 192 mm) |
| Drivers | 2x 2.5” midrange, 2x 0.75” tweeters + 6.5”x9” subwoofer | 1x 130mm (5”) subwoofer + 2x 70mm midrange drivers + 2x 20mm tweeters |
| Frequency Response | 30Hz - 20kHz (Manufacturer specified) | - |
| Amplifier Power | 200W | 160W RMS |
| Digital Aux Input | No | No |
| Bluetooth Version | 5.1 | 5.2 |
| Strap | No | No |
| USB Playback | - | No |
Watch Them Compared
Videos and reviews that test both speakers side by side.
Related Speaker Comparisons
More top alternatives to Harman Kardon Go + Play 3: