Short answer: the Gemini GRV-650L. It ranks #39 of 76 boombox speakers by sound quality, rated 3.3/5, at $149.95; the Sony ULT Field 7 ranks #43, rated 3.2/5, and costs $400, so there is little reason to consider the other one.
What the Gemini GRV-650L does well: Pretty amazing value for the money. The catch: Not quite as deep bass as the top ranked speakers.
Why pick the Sony ULT Field 7: Sony ULT Field 7 uses 2x 114mm x 114mm X-Balanced woofers + 2x 46mm (1.9”) tweeters. The catch: Bass is limited by its ~52Hz specification.
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.
There is a real battery-life gap here: the Sony ULT Field 7 is rated for 30 hours, the Gemini GRV-650L only 9 hours.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Specifications Side By Side
| Gemini GRV-650L | Sony ULT Field 7 | |
|---|---|---|
| Price | $149.95 | $400 |
| Ranked | #39 of 76 in Boombox Size Portable Bluetooth Speakers | #43 of 76 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 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 |
| Guitar Input | - | Yes |
| Microphone Input | - | Yes (Karaoke mode with echo effect) |
| Strap | - | No |
Related Speaker Comparisons
More worthwhile head-to-heads for Gemini GRV-650L:
- Tribit Stormbox Blast vs Gemini GRV-650L
- JBL Partybox Encore Essential 2 vs Gemini GRV-650L
- Gemini GRV-650L vs Harman Kardon Onyx Studio 9
- Zealot ZE51 vs Gemini GRV-650L
- Gemini GRV-650L vs Zealot ZE41
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.
As an eBay Partner, we may be compensated if you make a purchase.
The Two Speakers In Full
Gemini GRV-650L: $149.95 Amazon eBay
Pros: Pretty amazing value for the money. Decently deep bass, not quite as good as top ranked speakers. Included wireless microphone and remote control. Measured bass extension of ~47Hz (-10dB).
Cons: Not quite as deep bass as the top ranked speakers.
Full Gemini GRV-650L review and specifications →
| Amplifier Power | 320W |
|---|---|
| App | No |
| Aux Input | Yes |
| Bass Extension (-10dB) | ~47Hz |
| Battery Life | 9 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.3 |
| Built-in Microphone | No |
| Digital Aux Input | No |
| Dimensions | 10.9” x 10.2” x 14.4” (277 x 260 x 366 mm) |
| Drivers | 6.5” woofer + tweeter |
| EQ | No |
| FM Tuner | Yes |
| IP Rating | IPX5 |
| Maximum SPL | 104dB (Manufacturer specified) |
| MicroSD Playback | Yes |
| Omnidirectional | No |
| 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) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
Sony ULT Field 7: $400 Amazon eBay
Older model: the Sony SRS-XG500 (rated 3/5).
Pros: Sony ULT Field 7 uses 2x 114mm x 114mm X-Balanced woofers + 2x 46mm (1.9”) tweeters. Its 6.3 kg, claimed 30 hours (Manufacturer specified) battery life, IP67 protection, aux input and stereo playback make it a practical option for its intended room or portable use. Measured bass extension of ~52Hz (-10dB).
Cons: Bass is limited by its ~52Hz specification. There is no companion app. A peak around 8kHz, and bass does not reach as deep as the top-ranked speakers.
Full Sony ULT Field 7 review and specifications →
| Amplifier Power | 100W |
|---|---|
| App | No |
| Aux Input | Yes |
| Bass Extension (-10dB) | ~52Hz |
| Battery Life | 30 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC, AAC, LDAC |
| Bluetooth Version | 5.2 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 20.2” x 8.8” x 8.7” (512 x 224 x 222 mm) |
| Drivers | 2x 114mm x 114mm X-Balanced woofers + 2x 46mm (1.9”) tweeters |
| EQ | Yes (App + ULT button) |
| Guitar Input | Yes |
| IP Rating | IP67 |
| Microphone Input | Yes (Karaoke mode with echo effect) |
| Omnidirectional | No |
| Party Mode | Yes (Party Connect up to 100 speakers) |
| Power Bank | Yes (USB-A, 5V/1.5A) |
| Power Input | AC Power cord |
| Stereo | Yes |
| Strap | No |
| TWS | Yes |
| USB Playback | Yes |
| Weight | 13.9 lbs (6.3 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Sony ULT Field 7 vs Skullcandy Barrel
- Sony ULT Field 7 vs Soundcore Rave Party 2
- Sony ULT Field 7 vs Yeahbox Sonic Boom Max 3
- Sony ULT Field 7 vs Teufel Boomster NG (2017)
- Sony ULT Field 7 vs Onn Medium Party Speaker Gen 2
- Sony ULT Field 7 vs JBL Partybox On the Go
- Sony ULT Field 7 vs Sony SRS-XG500
- Sony ULT Field 7 vs W-King T11
- See all 74 comparisons