Short answer: the Ruimatech RM-10. It ranks #29 of 91 boombox speakers by sound quality, rated 3.8/5, at $159.99; the Sony ULT Field 7 ranks #56, rated 3.2/5, and costs $400, so there is little reason to consider the other one.
The Ruimatech RM-10 is the better-sounding pick. A three-way boombox (80W woofer, two 20W midranges, two 10W tweeters and dual passive radiators, 140W RMS) with a hi-fi leaning clarity, highs that don’t get screechy at max volume, and bass that holds on at full volume. Watch for: It is tuned bass boosted, much like the JBL Boombox 3.
The Sony ULT Field 7 is the longer-running pick. It is rated for 30 hours of battery against 14 for the Ruimatech RM-10. The tradeoff: A peak around 8kHz, and bass does not reach as deep as the top-ranked speakers.
Buy the Ruimatech RM-10. 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.
Specifications Side By Side
| Ruimatech RM-10 | Sony ULT Field 7 | |
|---|---|---|
| Price | $159.99 | $400 |
| Ranked | #29 of 91 in Boombox Size Portable Bluetooth Speakers | #56 of 91 in Boombox Size Portable Bluetooth Speakers |
| Amplifier Power | 140W RMS (300W peak) | 100W |
| Drivers | 80W woofer + 2x 20W midranges + 2x 10W tweeters + 2 passive radiators | 2x 114mm x 114mm X-Balanced woofers + 2x 46mm (1.9”) tweeters |
| IP Rating | IPX6 | IP67 |
| Battery Life | 14 hours at 30% volume (Manufacturer specified) | 30 hours (Manufacturer specified) |
| Power Bank | Yes (USB-C) | Yes (USB-A, 5V/1.5A) |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 5.3 | 5.2 |
| TWS | Yes | Yes |
| App | No | No |
| Stereo | Partially | Yes |
| Omnidirectional | No | No |
| Strap | No | No |
| Aux Input | - | Yes |
| Bass Extension (-10dB) | - | ~52Hz |
| Guitar Input | - | Yes |
| Microphone Input | - | Yes (Karaoke mode with echo effect) |
| Party Mode | - | Yes (Party Connect up to 100 speakers) |
| Power Input | - | AC Power cord |
| USB Playback | - | Yes |
| Weight | - | 13.9 lbs (6.3 kg) |
| Bluetooth Codecs | - | SBC, AAC, LDAC |
| EQ | - | Yes (App + ULT button) |
| Built-in Microphone | - | Yes |
| Dimensions | - | 20.2” x 8.8” x 8.7” (512 x 224 x 222 mm) |
| Digital Aux Input | - | No |
Related Speaker Comparisons
More worthwhile head-to-heads for Ruimatech RM-10:
- Tribit Stormbox Blast vs Ruimatech RM-10
- JBL Partybox Encore 2 vs Ruimatech RM-10
- JBL PartyBox On-The-Go 2 Plus vs Ruimatech RM-10
- JBL Partybox Encore Essential 2 vs Ruimatech RM-10
- JBL Partybox Encore Essential vs Ruimatech RM-10
Prices on this page were last checked October 4, 2026 at 9:58 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
Ruimatech RM-10: $159.99 Amazon eBay
Pros: A three-way boombox (80W woofer, two 20W midranges, two 10W tweeters and dual passive radiators, 140W RMS) with a hi-fi leaning clarity, highs that don’t get screechy at max volume, and bass that holds on at full volume. Side by side it beat the W-King X20S and X20 and sounded as good as the Tribit Stormbox Blast 2, especially at higher volume. IPX6, a claimed 14 hours, a USB-C power bank, 30W fast charging and stereo pairing.
Cons: It is tuned bass boosted, much like the JBL Boombox 3. There is no app or custom EQ and no shoulder strap, and the design is plain.
Full Ruimatech RM-10 review and specifications →
| Amplifier Power | 140W RMS (300W peak) |
|---|---|
| App | No |
| Battery Life | 14 hours at 30% volume (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Version | 5.3 |
| Drivers | 80W woofer + 2x 20W midranges + 2x 10W tweeters + 2 passive radiators |
| IP Rating | IPX6 |
| Omnidirectional | No |
| Power Bank | Yes (USB-C) |
| Stereo | Partially |
| Strap | No |
| TWS | Yes |
- Reviews, Comparisons and Sound Samples
- Jagist reviews: Ruimatech RM-10 Vs W-king X20!!! Battle Of Affordability!!! More from Jagistreviews →
- Jagist reviews: Ruimatech RM-10 Vs W-king X20s!!! Battle Of The Affordable’s!!!
- Jagist reviews: Tribit Stormbox Blast 2 Firmware 11 Vs Ruimatech RM-10!!! Battle Of The 3 Ways!!!
- Josh’s Gadgets and More: JBL Boombox 3 Wifi vs Ruimatech RM-10
- Head-to-Head Comparisons
- Ruimatech RM-10 vs W-King X20S
- Ruimatech RM-10 vs Tribit Stormbox Blast 2
- Ruimatech RM-10 vs JBL Boombox 3
- Ruimatech RM-10 vs JBL Boombox 3 Wifi
- Ruimatech RM-10 vs W-King H330
- Ruimatech RM-10 vs Soundcore Boom 2 Plus
- Ruimatech RM-10 vs Hopestar A90
- Ruimatech RM-10 vs W-King X20
- See all 30 comparisons
Sony ULT Field 7: $400 Amazon eBay
Older model: the Sony SRS-XG500 (ranked lower, rated 3/5).
Smaller model: the Sony ULT Field 1 (rated 3.1/5).
Larger model: the Sony ULT Tower 10 (rated 3.9/5).
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 | Yes |
| 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 Gemini GRV-650L
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