Short answer: the Harman Kardon Go + Play 3. It ranks #3 of 98 boombox speakers by sound quality, rated 4.4/5, at $385. The Zealot S89 ranks #19, rated 4.0/5, at $246.99, $138.01 cheaper, a saving that is not big enough to make up the sound-quality gap.
The Harman Kardon Go + Play 3 is the better-sounding, lighter choice. Warm sound with boosted bass. At 10.4 lbs (4.7 kg) it weighs noticeably less than the Zealot S89 at 16.1 lbs (7.3 kg). It supports AAC Bluetooth, which the Zealot S89 lacks. Watch for: Just a little over half as loud as the higher rated boomboxes.
The Zealot S89 is the longer-running, tougher choice. A 16.1 lbs (7.3 kg) boombox with a claimed 36Hz bass extension, 40-hour battery life, IPX6 protection, USB-C charging, aux, USB and microSD playback, TWS and multi-speaker PartyAdd. It is rated for 40 hours of battery against 8 for the Harman Kardon Go + Play 3. It is rated IPX6, while the Harman Kardon Go + Play 3 has no water resistance. It links with other speakers (PartyAdd up to 100 speakers), which the Harman Kardon Go + Play 3 cannot. The catch: At high volume, listener reports describe the bass as loose or muddy and the overall balance as less clear than better boombox speakers.
Buy the Harman Kardon Go + Play 3. It is rated higher for sound quality, and the $138.01 saving on the Zealot S89 is not enough to make up the difference.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Specifications Side By Side
| Harman Kardon Go + Play 3 | Zealot S89 | |
|---|---|---|
| Price | $385 | $246.99 |
| Ranked | #3 of 98 in Boombox Size Portable Bluetooth Speakers | #19 of 98 in Boombox Size Portable Bluetooth Speakers |
| App | Yes (Harman Kardon One app) | No |
| Aux Latency | 112ms | - |
| Bass Extension (-10dB) | 35Hz | 36Hz |
| Battery Life | 8 hours (Manufacturer specified) | 40 hours (Manufacturer specified) |
| Built-in Microphone | Yes | No |
| EQ | Yes (App EQ) | Yes (multiple modes) |
| IP Rating | None | IPX6 |
| Bluetooth Latency | 120ms | - |
| Maximum SPL | 103dB (measured by Alan Ross Reviews) | - |
| Power Input | AC Power brick | USB-C |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 10.4 lbs (4.7 kg) | 16.1 lbs (7.3 kg) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC, AAC | SBC |
| Power Bank | Yes | Yes (USB-A + USB-C) |
| Party Mode | No | Yes (PartyAdd up to 100 speakers) |
| USB Playback | No | Yes |
| Bluetooth Version | 5.2 | 5.3 |
| Amplifier Power | 160W RMS | 250W |
| Dimensions | 17.3” x 9.4” x 7.6” (439 x 240 x 192 mm) | 21.2” x 10.4” x 9.4” (538 x 265 x 240 mm) |
| Aux Input | Yes | Yes |
| Drivers | 1x 130mm (5”) subwoofer + 2x 70mm midrange drivers + 2x 20mm tweeters | 130W subwoofer + 2x 40mm drivers + 2x tweeters |
| Digital Aux Input | No | No |
| Strap | No | No |
| MicroSD Playback | - | Yes |
Related Speaker Comparisons
More top alternatives to Harman Kardon Go + Play 3:
- EarFun Uboom X vs Harman Kardon Go + Play 3
- Harman Kardon Go + Play 3 vs Tribit Stormbox Blast
- Harman Kardon Go + Play 3 vs JBL Partybox Encore 2
- Harman Kardon Go + Play 3 vs JBL Partybox Encore Essential 2
- Harman Kardon Go + Play 3 vs JBL Partybox Encore
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
Harman Kardon Go + Play 3: $385 Amazon $385 eBay
Older model: the Harman Kardon Go + Play 2 (ranked lower, rated 3.9/5). See every Harman Kardon Go + Play generation.
Pros: Warm sound with boosted bass. Deepest bass out of any speaker in this size. Sound is more natural than the Harman Kardon Go + Play 2. An aux input, a built-in microphone, a power bank function, stereo pairing and hidden button combinations for adjusting bass and treble. Measured bass extension of 35Hz (-10dB).
Cons: Just a little over half as loud as the higher rated boomboxes. Only 8 hours of battery at medium volume. No water rating.
Setup: Use the hidden EQ modes to adjust the bass up when outside and down when inside. To adjust bass, quickly press the bluetooth and volume down buttons together, the number of light flashes tell you what mode you’re in. To adjust treble, quickly press the volume up and phone buttons at the same time, the number of yellow flashes on the light tell you what mode you are in.
Full Harman Kardon Go + Play 3 review and specifications →
| Released | Jul 2023 (3 years ago) |
|---|---|
| Amplifier Power | 160W RMS |
| App | Yes (Harman Kardon One app) |
| Aux Input | Yes |
| Aux Latency | 112ms |
| Bass Extension (-10dB) | 35Hz |
| Battery Life | 8 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC, AAC |
| Bluetooth Latency | 120ms |
| Bluetooth Version | 5.2 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 17.3” x 9.4” x 7.6” (439 x 240 x 192 mm) |
| Drivers | 1x 130mm (5”) subwoofer + 2x 70mm midrange drivers + 2x 20mm tweeters |
| EQ | Yes (App EQ) |
| IP Rating | None |
| Maximum SPL | 103dB (measured by Alan Ross Reviews) |
| Omnidirectional | No |
| Party Mode | No |
| Power Bank | Yes |
| Power Input | AC Power brick |
| Stereo | Yes |
| Strap | No |
| TWS | Yes |
| USB Playback | No |
| Weight | 10.4 lbs (4.7 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Oluv Patreon: Harman Kardon go+play 3 - best sounding? More from Oluv’Sone →
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- Oluv Patreon: Harman Kardon go+play 3 vs JBL Xtreme 4 - first impressions
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- Alan Ross Reviews: Harman Kardon Go + Play 3 hidden eq modes - world has gone crazy! 🤣 More from alanrossreviews →
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- Jagist reviews: Bugani Brief Pro Vs Harmon Kardon Go Plus Play 3!!! More from Jagistreviews →
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- Head-to-Head Comparisons
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Zealot S89: $246.99 Amazon $246.99 AliExpress $193.58 eBay
Pros: A 7.3kg boombox with a claimed 36Hz bass extension, 40-hour battery life, IPX6 protection, USB-C charging, aux, USB and microSD playback, TWS and multi-speaker PartyAdd. Listener comparisons find it capable of very high output and substantial bass for outdoor use. A great value for its bass, battery life and maximum volume. Measured bass extension of 36Hz (-10dB).
Cons: At high volume, listener reports describe the bass as loose or muddy and the overall balance as less clear than better boombox speakers. The heavy cabinet and basic finish also make it less polished for daily portability, while its multiple EQ modes cannot substitute for a genuinely neutral tuning.
Full Zealot S89 review and specifications →
| Released | Mar 2025 (1 year ago) |
|---|---|
| Amplifier Power | 250W |
| App | No |
| Aux Input | Yes |
| Bass Extension (-10dB) | 36Hz |
| Battery Life | 40 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.3 |
| Built-in Microphone | No |
| Digital Aux Input | No |
| Dimensions | 21.2” x 10.4” x 9.4” (538 x 265 x 240 mm) |
| Drivers | 130W subwoofer + 2x 40mm drivers + 2x tweeters |
| EQ | Yes (multiple modes) |
| IP Rating | IPX6 |
| MicroSD Playback | Yes |
| Omnidirectional | No |
| Party Mode | Yes (PartyAdd up to 100 speakers) |
| Power Bank | Yes (USB-A + USB-C) |
| Power Input | USB-C |
| Stereo | Yes |
| Strap | No |
| TWS | Yes |
| USB Playback | Yes |
| Weight | 16.1 lbs (7.3 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Joy & Oluv’Sone: Zealot S89 vs Yeahbox Sonic Boom Max 3 - indoor listening fun More from Oluv’Sone →
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- Oluv Patreon: Zealot S89 vs Yeahbox Sonic Boom Max3 - outdoor test
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- Oluv Patreon: Zealot S89 vs Yeahbox Boom Max3 - indoor listening test
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