Short answer: the Harman Kardon Onyx Studio 9 for the higher ranking, the Gemini GRV-650L for the lower price. The Harman Kardon Onyx Studio 9 ranks #13 of 70 boombox speakers at $186.99. The Gemini GRV-650L ranks #35 at $149.95, $37.04 cheaper.
On the Gemini GRV-650L side: Pretty amazing value for the money. The catch: Not quite as deep bass as the top ranked speakers.
The case for the Harman Kardon Onyx Studio 9: Auracast multi-speaker connection alongside classic stereo pairing. The catch: Slight recessed mids, boost in the upper mids, rolled off upper treble.
Buy the Gemini GRV-650L if the price matters more than the ranking. Buy the Harman Kardon Onyx Studio 9 if the ranking matters more than the price.
Specifications Side By Side
| Gemini GRV-650L | Harman Kardon Onyx Studio 9 | |
|---|---|---|
| Price | $149.95 | $186.99 |
| Ranked | #35 of 70 in Boombox Size Portable Bluetooth Speakers | #13 of 70 in Boombox Size Portable Bluetooth Speakers |
| Aux Input | Yes | - |
| Bass Extension (-10dB) | ~47Hz | 41Hz |
| Battery Life | 9 hours (Manufacturer specified) | 8 hours (Manufacturer specified) |
| MicroSD Playback | Yes | - |
| Power Bank | Yes | - |
| Stereo | Partially (1 woofer) | Yes |
| USB Playback | Yes | No |
| Weight | 15.7 lbs / 7.1 kg | 9.3 lbs / 4.2 kg |
| Bluetooth Codecs | SBC | SBC |
| App | No | Yes (Harman Kardon One app) |
| EQ | No | Yes (App EQ) |
| TWS | Yes | Yes |
| Party Mode | No | Yes (Auracast) |
| Built in Microphone | No | - |
| Power Input | USB-C | USB-C |
| FM Tuner | Yes | - |
| Output Power | 320W | 50W RMS |
| Dimensions | 10.91" x 10.24" x 14.41" (277 x 260 x 366 mm) | 11.39" x 11.32" x 5.12" (289.2 x 287.5 x 130 mm) |
| Drivers | 6.5" woofer + tweeter | 120mm woofer + 3x 20mm tweeters |
| IP Rating | IPX5 | None |
| Max Volume | 104dB | 101dB |
| Bluetooth Version | - | 5.3 |
The Two Speakers In Full
Gemini GRV-650L: $149.95 Amazon
Pros: Pretty amazing value for the money. Decently deep bass, not quite as good as top ranked speakers. Included wireless microphone and remote control
Cons: Not quite as deep bass as the top ranked speakers.
| App | No |
|---|---|
| Aux Input | Yes |
| Bass Extension (-10dB) | ~47Hz |
| Battery Life | 9 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Built in Microphone | No |
| Dimensions | 10.91" x 10.24" x 14.41" (277 x 260 x 366 mm) |
| Drivers | 6.5" woofer + tweeter |
| EQ | No |
| FM Tuner | Yes |
| IP Rating | IPX5 |
| Max Volume | 104dB |
| MicroSD Playback | Yes |
| Output Power | 320W |
| Party Mode | No |
| Power Bank | Yes |
| Power Input | USB-C |
| Stereo | Partially (1 woofer) |
| TWS | Yes |
| USB Playback | Yes |
| Weight | 15.7 lbs / 7.1 kg |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Links
Harman Kardon Onyx Studio 9: $186.99 Amazon
Pros: Auracast multi-speaker connection alongside classic stereo pairing. Harman Kardon One app with EQ. USB-C charging, up from the previous generation’s AC power brick.
Cons: Slight recessed mids, boost in the upper mids, rolled off upper treble. Not as deep bass as previous Onyx Studio speakers.
| App | Yes (Harman Kardon One app) |
|---|---|
| Bass Extension (-10dB) | 41Hz |
| Battery Life | 8 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.3 |
| Dimensions | 11.39" x 11.32" x 5.12" (289.2 x 287.5 x 130 mm) |
| Drivers | 120mm woofer + 3x 20mm tweeters |
| EQ | Yes (App EQ) |
| IP Rating | None |
| Max Volume | 101dB |
| Output Power | 50W RMS |
| Party Mode | Yes (Auracast) |
| Power Input | USB-C |
| Stereo | Yes |
| TWS | Yes |
| USB Playback | No |
| Weight | 9.3 lbs / 4.2 kg |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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- Links
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Product prices and availability were last checked August 9, 2026 at 6:57 AM UTC 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.