Short answer: the JBL Authentics 300. It ranks #33 of 76 boombox speakers by sound quality, rated 3.5/5, at $299.95. The Gemini GGO-650L ranks #61, rated 2.5/5, at $99.95, $200 cheaper, a saving that is not big enough to make up the sound-quality gap.
What the JBL Authentics 300 does well: Integrates both Amazon Alexa and Google Assistant simultaneously (rare for smart speakers). The catch: Narrow sounding, bass not as deep as others.
What the Gemini GGO-650L does well: At 4.2 kg, Gemini GGO-650L combines 6.5” woofer + tweeter with Bluetooth and aux. The tradeoff: Bass is limited by its ~56Hz specification.
Buy the JBL Authentics 300. It is rated higher for sound quality, and saving $200 with the Gemini GGO-650L does not make up for the sound-quality gap.
If water resistance matters to you, the Gemini GGO-650L at IPX5 (water jets) holds up far better than the JBL Authentics 300 at no water resistance.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
Specifications Side By Side
| JBL Authentics 300 | Gemini GGO-650L | |
|---|---|---|
| Price | $299.95 | $99.95 |
| Ranked | #33 of 76 in Boombox Size Portable Bluetooth Speakers | #61 of 76 in Boombox Size Portable Bluetooth Speakers |
| App | Yes | No |
| Bass Extension (-10dB) | 45Hz | ~56Hz |
| Battery Life | 8 hours (Manufacturer specified) | 10 hours (Manufacturer specified) |
| EQ | Yes (App EQ) | No |
| IP Rating | None | IPX5 |
| Maximum SPL | 100dB (measured by Alan Ross Reviews) | - |
| Party Mode | Yes (Wi-Fi Multi-Room) | No |
| Power Input | AC Power cable | USB-C |
| Stereo | Partially (1 woofer) | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 10.8 lbs (4.9 kg) | 9.3 lbs (4.2 kg) |
| Wi-Fi | Yes | - |
| Bluetooth Codecs | SBC | SBC |
| Power Bank | No | No |
| USB Playback | Yes | Yes |
| Built-in Microphone | Yes | Yes |
| MicroSD Playback | No | Yes |
| Aux Input | No | Yes |
| Amplifier Power | 100W | 100W |
| Dimensions | 13.5” x 7.7” x 7.1” (342 x 195.6 x 180.3 mm) | 11.8” x 9.1” x 15” (300 x 230 x 380 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 | - |
| FM Tuner | - | Yes |
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Prices on this page were last checked September 26, 2026 at 11:14 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
JBL Authentics 300: $299.95 Amazon eBay
Pros: Integrates both Amazon Alexa and Google Assistant simultaneously (rare for smart speakers). Retro seventies design with leather and Quadrex grille. 100-watt amp, carries well with leather-trimmed handle. Rechargeable battery rated ~8 hours. Measured bass extension of 45Hz (-10dB).
Cons: Narrow sounding, bass not as deep as others. Peaky upper mids. No TWS. No IP rating. Not as loud as others. Not much battery life.
Full JBL Authentics 300 review and specifications →
| Amplifier Power | 100W |
|---|---|
| App | Yes |
| Aux Input | No |
| Bass Extension (-10dB) | 45Hz |
| Battery Life | 8 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.3 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 13.5” x 7.7” x 7.1” (342 x 195.6 x 180.3 mm) |
| Drivers | 1” tweeter + 4” woofer + passive radiators |
| EQ | Yes (App EQ) |
| IP Rating | None |
| Maximum SPL | 100dB (measured by Alan Ross Reviews) |
| MicroSD Playback | No |
| Omnidirectional | No |
| Party Mode | Yes (Wi-Fi Multi-Room) |
| Power Bank | No |
| Power Input | AC Power cable |
| Stereo | Partially (1 woofer) |
| Strap | No |
| TWS | Yes |
| USB Playback | Yes |
| Voice Assistants | Amazon Alexa & Google Assistant (simultaneous) |
| Weight | 10.8 lbs (4.9 kg) |
| Wi-Fi | Yes |
- Links
- Reviews, Comparisons and Sound Samples
- JOY‘s 🎧3D🔈Audio-Show: JBL Authentics 300 - sound quality test More from Oluv’Sone →
- Oluv Patreon: JBL Authentics 300 - update
- Oluv Patreon: JBL Authentics 300 - listening session
- Alan Ross Reviews: Not quite! JBL Authentics 300 review and sound test vs Boombox 3, Encore and Stormbox Blast More from alanrossreviews →
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Gemini GGO-650L: $99.95 Amazon eBay
Pros: At 4.2 kg, Gemini GGO-650L combines 6.5” woofer + tweeter with Bluetooth and aux. Claimed 10 hours (manufacturer specified) battery life, ipx5 protection and stereo playback make its feature set practical for its intended room or portable use. Measured bass extension of ~56Hz (-10dB).
Cons: Bass is limited by its ~56Hz specification. There is no companion app. No EQ adjustment.
Full Gemini GGO-650L review and specifications →
| Amplifier Power | 100W |
|---|---|
| App | No |
| Aux Input | Yes |
| Bass Extension (-10dB) | ~56Hz |
| Battery Life | 10 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.3 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 11.8” x 9.1” x 15” (300 x 230 x 380 mm) |
| Drivers | 6.5” woofer + tweeter |
| EQ | No |
| FM Tuner | Yes |
| IP Rating | IPX5 |
| MicroSD Playback | Yes |
| Omnidirectional | No |
| Party Mode | No |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | Yes |
| TWS | Yes |
| USB Playback | Yes |
| Weight | 9.3 lbs (4.2 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons