Short answer: the Gemini GRV-650L. It ranks #56 of 113 boombox speakers by sound quality, rated 3.3/5, at $149.95; the Sony ULT Field 7 ranks #61, rated 3.2/5, and costs $448, so there is little reason to consider the other one.
What the Gemini GRV-650L does well: A great value party speaker with an included wireless mic, remote, FM radio and water resistance. The catch: Not quite as deep bass as the top ranked speakers.
The Sony ULT Field 7 is the longer-running, tougher choice. A waterproof stereo party speaker with a 30 hour battery and karaoke mic and guitar inputs. It is rated for 30 hours of battery against 9 for the Gemini GRV-650L. It is rated IP67 against IPX5 for the Gemini GRV-650L. It supports LDAC Bluetooth, which the Gemini GRV-650L lacks. The tradeoff: A peak around 8kHz, and bass does not reach as deep as the top-ranked speakers.
Buy the Gemini GRV-650L. It is rated higher for sound quality than the Sony ULT Field 7 and costs less, so it is the default pick unless a specific strength of the other one matters more to you.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Prices on this page were last checked November 11, 2026 at 3:26 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
| Gemini GRV-650L | Sony ULT Field 7 | |
|---|---|---|
| Price | $149.95 | $448.00 |
| Ranked | #56 of 113 in Boombox Size Portable Bluetooth Speakers | #61 of 113 in Boombox Size Portable Bluetooth Speakers |
| Aux Input | Yes | Yes |
| Bass Extension (-10dB) | ~47Hz | ~52Hz |
| Battery Life | 9 hours (Manufacturer specified) | 30 hours (Manufacturer specified) |
| MicroSD Playback | Yes | - |
| Power Bank | Yes | Yes (USB-A, 5V/1.5A) |
| Stereo | Partially (1 woofer) | Yes |
| Omnidirectional | No | No |
| USB Playback | Yes | Yes |
| Weight | 15.7 lbs (7.1 kg) | 13.9 lbs (6.3 kg) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC, AAC, LDAC |
| App | No | No |
| EQ | No | Yes (App + ULT button) |
| TWS | Yes | Yes |
| Party Mode | No | Yes (Party Connect up to 100 speakers) |
| Built-in Microphone | No | Yes |
| Power Input | USB-C | AC Power cord |
| FM Tuner | Yes | - |
| Amplifier Power | 320W | 100W |
| Dimensions | 10.9” x 10.2” x 14.4” (277 x 260 x 366 mm) | 20.2” x 8.8” x 8.7” (512 x 224 x 222 mm) |
| Drivers | 6.5” woofer + tweeter | 2x 114mm x 114mm X-Balanced woofers + 2x 46mm (1.9”) tweeters |
| IP Rating | IPX5 | IP67 |
| Maximum SPL | 104dB (Manufacturer specified) | - |
| Digital Aux Input | No | No |
| Bluetooth Version | 5.3 | 5.2 |
| Strap | No | No |
| Guitar Input | - | Yes |
| Microphone Input | - | Yes (Karaoke mode with echo effect) |
Related Speaker Comparisons
More worthwhile head-to-heads for Gemini GRV-650L: