Short answer: the Zealot S89. It ranks #19 of 113 boombox speakers by sound quality (rated 4.0/5); the Teufel Boomster 4 ranks #50 (rated 3.4/5).
The Zealot S89 is the better-sounding, longer-running choice. A great value boombox with deep bass, very high volume, a 40 hour battery and water resistance for outdoor parties. It is rated for 40 hours of battery against 23 for the Teufel Boomster 4. The catch: At high volume, listener reports describe the bass as loose or muddy and the overall balance as less clear than better boombox speakers.
The Teufel Boomster 4 is the lighter choice. A stereo boombox with DAB+ and FM radio, a long battery, splash resistance and a remote with treble control. At 8.3 lbs (3.75 kg) it weighs much less than the Zealot S89 at 16.1 lbs (7.3 kg). It supports aptX HD Bluetooth, which the Zealot S89 lacks. The catch: Side by side with the Teufel Boomster 2021 the sound barely changed, and it has a little less deep bass.
Buy the Zealot S89. It is rated higher for sound quality than the Teufel Boomster 4.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
Prices on this page were last checked November 14, 2026 at 6:17 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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Specifications Side By Side
| Zealot S89 | Teufel Boomster 4 | |
|---|---|---|
| Price | $193.58 | €249.99 |
| Ranked | #19 of 113 in Boombox Size Portable Bluetooth Speakers | #50 of 113 in Boombox Size Portable Bluetooth Speakers |
| App | No | No |
| Aux Input | Yes | Yes |
| Bass Extension (-10dB) | 36Hz | - |
| Battery Life | 40 hours (Manufacturer specified) | 23 hours (Manufacturer specified) |
| EQ | Yes (multiple modes) | Yes (treble control) |
| IP Rating | IPX6 | IPX5 |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | aptX HD, AAC, SBC |
| MicroSD Playback | Yes | - |
| Party Mode | Yes (PartyAdd up to 100 speakers) | - |
| Power Input | USB-C | USB-C |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 16.1 lbs (7.3 kg) | 8.3 lbs (3.75 kg) |
| Power Bank | Yes (USB-A + USB-C) | No |
| USB Playback | Yes | - |
| Built-in Microphone | No | - |
| Amplifier Power | 250W | 42W RMS |
| Dimensions | 21.2” x 10.4” x 9.4” (538 x 265 x 240 mm) | 7.1”H x 14.6”W x 5.8”D (180 x 370 x 148 mm) |
| Drivers | 130W subwoofer + 2x 40mm drivers + 2x tweeters | 2x 20mm tweeters + 2x 65mm midrange drivers + 1x 110mm (4.3”) woofer, passive bass radiators |
| Digital Aux Input | No | - |
| Bluetooth Version | 5.3 | 5.0 |
| Strap | No | No |
| FM Tuner | - | Yes (plus DAB+) |
Where the Ratings Come From
- Zealot S89: reviews by Joy & Oluv’Sone, Oluv and Dominik.
- Teufel Boomster 4: reviews by Dominik and Mateusz Cholewa.
This comparison is generated from the ratings, specifications and measurements on each product’s own page, and it updates when that data changes. How we rank explains how each rating is decided.
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