Short answer: the Sony ULT Field 7. It ranks #43 of 76 boombox speakers by sound quality, rated 3.2/5, at $400. The Monster Rockin’ Roller 270 ranks #70, rated 2.1/5, at $249, $151 cheaper, a saving that is not big enough to make up the sound-quality gap.
The case for 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.
Why pick the Monster Rockin’ Roller 270: 100 hour battery life. The catch: Bass not as deep as competitors, less neutral than ION speakers.
Buy the Sony ULT Field 7. It is rated higher for sound quality, and saving $151 with the Monster Rockin’ Roller 270 does not make up for the sound-quality gap.
Battery life favors the Monster Rockin’ Roller 270: rated for 100 hours against 30 hours for the Sony ULT Field 7.
Water resistance is not close: the Sony ULT Field 7 is rated at IP67 (brief submersion), well ahead of the Monster Rockin’ Roller 270 at IPX4 (splashing).
Looking for alternatives? See the complete Portable Bluetooth rankings.
Specifications Side By Side
| Sony ULT Field 7 | Monster Rockin’ Roller 270 | |
|---|---|---|
| Price | $400 | $249.00 |
| Ranked | #43 of 76 in Boombox Size Portable Bluetooth Speakers | #70 of 76 in Boombox Size Portable Bluetooth Speakers |
| Aux Input | Yes | Yes |
| Bass Extension (-10dB) | ~52Hz | 53Hz |
| Battery Life | 30 hours (Manufacturer specified) | 100 hours (Manufacturer specified) |
| Guitar Input | Yes | - |
| IP Rating | IP67 | IPX4 |
| Microphone Input | Yes (Karaoke mode with echo effect) | - |
| Party Mode | Yes (Party Connect up to 100 speakers) | No |
| Power Bank | Yes (USB-A, 5V/1.5A) | Yes (USB-A, 5V/2.1A) |
| Power Input | AC Power cord | USB-C |
| Stereo | Yes | No |
| Omnidirectional | No | No |
| USB Playback | Yes | No |
| Weight | 13.9 lbs (6.3 kg) | 28.7 lbs (13 kg) |
| Bluetooth Codecs | SBC, AAC, LDAC | SBC |
| App | No | Yes (Monster Zone Control app) |
| EQ | Yes (App + ULT button) | Yes |
| TWS | Yes | Yes |
| Built-in Microphone | Yes | No |
| Bluetooth Version | 5.2 | 5.0 |
| Dimensions | 20.2” x 8.8” x 8.7” (512 x 224 x 222 mm) | 15” x 18.6” x 10.9” (381 x 472 x 276 mm) |
| Amplifier Power | 100W | 200W |
| Drivers | 2x 114mm x 114mm X-Balanced woofers + 2x 46mm (1.9”) tweeters | 2x 3” (76mm) woofers + 2x tweeters (size undisclosed) |
| Digital Aux Input | No | No |
| Strap | No | - |
| FM Tuner | - | Yes |
| Maximum SPL | - | 96dB (Manufacturer specified) |
| Wheels | - | 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
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
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- Sony ULT Field 7 vs Sony SRS-XG500
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Monster Rockin’ Roller 270: $249.00 Amazon eBay
Pros: 100 hour battery life. 270° sound coverage, stereo output. IPX4 weather-resistant. Wheels and integrated handle. Qi wireless charging pad for your phone. TWS pairing with another 270. Measured bass extension of 53Hz (-10dB).
Cons: Bass not as deep as competitors, less neutral than ION speakers. Very heavy
Full Monster Rockin’ Roller 270 review and specifications →
| Amplifier Power | 200W |
|---|---|
| App | Yes (Monster Zone Control app) |
| Aux Input | Yes |
| Bass Extension (-10dB) | 53Hz |
| Battery Life | 100 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.0 |
| Built-in Microphone | No |
| Digital Aux Input | No |
| Dimensions | 15” x 18.6” x 10.9” (381 x 472 x 276 mm) |
| Drivers | 2x 3” (76mm) woofers + 2x tweeters (size undisclosed) |
| EQ | Yes |
| FM Tuner | Yes |
| IP Rating | IPX4 |
| Maximum SPL | 96dB (Manufacturer specified) |
| Omnidirectional | No |
| Party Mode | No |
| Power Bank | Yes (USB-A, 5V/2.1A) |
| Power Input | USB-C |
| Stereo | No |
| TWS | Yes |
| USB Playback | No |
| Weight | 28.7 lbs (13 kg) |
| Wheels | Yes |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Monster Rockin’ Roller 270 vs Turtlebox Gen 3
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