Short answer: the JBL Authentics 300 for better sound quality, the Gemini GRV-650L for the lower price. The JBL Authentics 300 ranks #46 of 113 boombox speakers, rated 3.5/5, at $299.95. The Gemini GRV-650L ranks #56, rated 3.3/5, at $149.95, $150 cheaper.
The JBL Authentics 300 is the lighter pick. A retro styled smart speaker with both Alexa and Google Assistant, a leather handle and battery power. At 10.8 lbs (4.9 kg) it weighs noticeably less than the Gemini GRV-650L at 15.7 lbs (7.1 kg). It links with other speakers (Wi-Fi Multi-Room), which the Gemini GRV-650L cannot. It has an adjustable EQ, which the Gemini GRV-650L lacks. The tradeoff: Narrow sounding, bass not as deep as others.
The Gemini GRV-650L is the tougher choice. A great value party speaker with an included wireless mic, remote, FM radio and water resistance. It is rated IPX5, while the JBL Authentics 300 has no water resistance. It keeps a wired aux input, which the JBL Authentics 300 lacks. The tradeoff: Not quite as deep bass as the top ranked speakers.
Buy the JBL Authentics 300 when sound quality outweighs the price for you, and the Gemini GRV-650L when the price outweighs sound quality instead.
Want more options? Browse the full Portable Bluetooth rankings.
Prices on this page were last checked November 7, 2026 at 7:34 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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Specifications Side By Side
| JBL Authentics 300 | Gemini GRV-650L | |
|---|---|---|
| Price | $299.95 | $149.95 |
| Ranked | #46 of 113 in Boombox Size Portable Bluetooth Speakers | #56 of 113 in Boombox Size Portable Bluetooth Speakers |
| App | Yes | No |
| Bass Extension (-10dB) | 45Hz | ~47Hz |
| Battery Life | 8 hours (Manufacturer specified) | 9 hours (Manufacturer specified) |
| EQ | Yes (App EQ) | No |
| IP Rating | None | IPX5 |
| Maximum SPL | 100dB (measured by Alan Ross Reviews) | 104dB (Manufacturer specified) |
| Party Mode | Yes (Wi-Fi Multi-Room) | No |
| Power Input | AC Power cable | USB-C |
| Stereo | Partially (1 woofer) | Partially (1 woofer) |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 10.8 lbs (4.9 kg) | 15.7 lbs (7.1 kg) |
| Wi-Fi | Yes | - |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| Power Bank | No | Yes |
| USB Playback | Yes | Yes |
| Built-in Microphone | Yes | No |
| MicroSD Playback | No | Yes |
| Aux Input | No | Yes |
| Amplifier Power | 100W | 320W |
| Dimensions | 13.5” x 7.7” x 7.1” (342 x 195.6 x 180.3 mm) | 10.9” x 10.2” x 14.4” (277 x 260 x 366 mm) |
| Drivers | 1” tweeter + 4” woofer + passive radiators | 6.5” woofer + tweeter |
| Digital Aux Input | No | No |
| Bluetooth Version | 5.3 | 5.3 |
| Voice Assistants | Amazon Alexa & Google Assistant (simultaneous) | - |
| Strap | No | No |
| FM Tuner | - | Yes |
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