Short answer: the Sony ULT Field 7, if you are buying new. The Teufel Boomster NG (2017) measures as well as it (#53 vs #56 of 90 boombox speakers, 3.2/5 vs 3.2/5) but is discontinued, so only consider it used; the Sony ULT Field 7 is still sold new at $400.
Buy the Sony ULT Field 7 new; the Teufel Boomster NG (2017) is no longer sold new, so it only makes sense as a used find.
There is a real battery-life gap here: the Sony ULT Field 7 is rated for 30 hours, the Teufel Boomster NG (2017) only 18 hours.
There is a real gap in water resistance: the Sony ULT Field 7 at IP67 (brief submersion) against the Teufel Boomster NG (2017), which has no water resistance.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
Specifications Side By Side
| Teufel Boomster NG (2017) | Sony ULT Field 7 | |
|---|---|---|
| Price | €99 Discontinued | $400 |
| Ranked | #53 of 90 in Boombox Size Portable Bluetooth Speakers | #56 of 90 in Boombox Size Portable Bluetooth Speakers |
| Bass Extension (-10dB) | 47Hz | ~52Hz |
| Battery Life | 18 hours (Manufacturer specified) | 30 hours (Manufacturer specified) |
| IP Rating | None | IP67 |
| Power Bank | Yes (USB-A) | Yes (USB-A, 5V/1.5A) |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| Weight | 7.5 lbs (3.4 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 | No | Yes |
| Party Mode | No | Yes (Party Connect up to 100 speakers) |
| Removable Battery | Yes | - |
| USB Playback | No | Yes |
| Built-in Microphone | No | Yes |
| Power Input | USB-C | AC Power cord |
| Amplifier Power | 38W RMS | 100W |
| Dimensions | 5.7” x 14.6” x 7.1” (145 x 370 x 180 mm) | 20.2” x 8.8” x 8.7” (512 x 224 x 222 mm) |
| Drivers | 1x 90mm woofer + 2x 65mm midrange drivers + 2x 20mm tweeters | 2x 114mm x 114mm X-Balanced woofers + 2x 46mm (1.9”) tweeters |
| Digital Aux Input | No | No |
| Aux Input | Yes | Yes |
| Bluetooth Version | 4.0 | 5.2 |
| Guitar Input | - | Yes |
| Microphone Input | - | Yes (Karaoke mode with echo effect) |
| Strap | - | No |
Related Speaker Comparisons
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Prices on this page were last checked October 3, 2026 at 10:26 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
Teufel Boomster NG (2017): €99 Discontinued eBay
Newer model: the Teufel Boomster 4, ranked higher, rated 3.4/5.
Pros: Teufel Boomster NG (2017) uses 1x 90mm woofer + 2x 65mm midrange drivers + 2x 20mm tweeters. Its 3.4 kg, claimed 18 hours (Manufacturer specified) battery life and stereo playback make it a practical option for its intended room or portable use. The battery is removable. Measured bass extension of 47Hz (-10dB).
Cons: Bass is limited by its 47Hz specification. There is no companion app. No EQ adjustment. The bass port can make noise, and there is no water rating. Discontinued.
Full Teufel Boomster NG (2017) review and specifications →
| Amplifier Power | 38W RMS |
|---|---|
| App | No |
| Aux Input | Yes |
| Bass Extension (-10dB) | 47Hz |
| Battery Life | 18 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 4.0 |
| Built-in Microphone | No |
| Digital Aux Input | No |
| Dimensions | 5.7” x 14.6” x 7.1” (145 x 370 x 180 mm) |
| Drivers | 1x 90mm woofer + 2x 65mm midrange drivers + 2x 20mm tweeters |
| EQ | No |
| IP Rating | None |
| Omnidirectional | No |
| Party Mode | No |
| Power Bank | Yes (USB-A) |
| Power Input | USB-C |
| Removable Battery | Yes |
| Stereo | Yes |
| TWS | No |
| USB Playback | No |
| Weight | 7.5 lbs (3.4 kg) |
- Reviews, Comparisons and Sound Samples
- No independent measurement review is linked for this model; it is ranked from hands-on listening and comparison against similarly priced speakers.
- Head-to-Head Comparisons
- Teufel Boomster NG (2017) vs Soundcore Rave Party 2
- Teufel Boomster NG (2017) vs Teufel Boomster 2021
- Teufel Boomster NG (2017) vs JBL Partybox On the Go
- Teufel Boomster NG (2017) vs Sony SRS-XG500
- Teufel Boomster NG (2017) vs JBL Boombox
- Teufel Boomster NG (2017) vs B&O Beolit 20
- Teufel Boomster NG (2017) vs Soundcore Motion Boom+
- Teufel Boomster NG (2017) vs JBL Authentics 300
- See all 24 comparisons
Sony ULT Field 7: $400 Amazon eBay
Older model: the Sony SRS-XG500 (ranked lower, 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 | 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 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
- Sony ULT Field 7 vs JBL Boombox
- See all 76 comparisons