Short answer: the Teufel Rockster Air. It ranks #23 of 46 party speakers by sound quality; the Soundboks 4 ranks #24.
What the Soundboks 4 gets right: Tied for the loudest battery-powered speaker, with a removable 40-hour battery. The catch: very large, not stereo, and behind the top Partyboxes on neutrality and bass.
On the Teufel Rockster Air side: An exceptional 58-hour battery, tight bass, and true wireless stereo pairing between two units. The tradeoff: a peaky, not-very-natural midrange, distortion above half volume, and it’s only sold in Europe.
Buy the Soundboks 4 if the price matters more than sound quality. Buy the Teufel Rockster Air if sound quality matters more than the price.
Specifications Side By Side
| Soundboks 4 | Teufel Rockster Air | |
|---|---|---|
| Price | $1199 | €500 Discontinued |
| Ranked | #24 of 46 in Party Size Portable Bluetooth Speakers | #23 of 46 in Party Size Portable Bluetooth Speakers |
| App | Yes | No |
| Aux Input | Yes | Yes |
| Bass Extension (-10dB) | 52Hz | ~52Hz |
| Battery Life | 40 hours (Manufacturer specified) | 30 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC | aptX, SBC |
| Bluetooth Version | 5.0 | 4.0 |
| Dimensions | 25.6" x 17" x 13" (650.2 x 431.8 x 330.2 mm) | 11.8" x 21.3" x 11" (300 x 540 x 280 mm) |
| Drivers | 2x 10" woofers, 1" compression driver | 2x 40mm tweeters + 2x 50mm woofers + passive radiators |
| EQ | Yes | No |
| Frequency Response | 40Hz - 20kHz (Manufacturer specified) | - |
| Guitar Input | Yes | - |
| IP Rating | IP65 | None |
| Max Volume | 126dB | 115dB |
| Microphone Input | Yes | - |
| Party Mode | Yes (TeamUp, up to 5 speakers) | No |
| Power Bank | No | Yes |
| Power Input | AC Power cord | AC Power cord |
| Removable Battery | Yes | - |
| SKAA | Yes | - |
| Stereo | Yes | Yes |
| TWS | Yes | No |
| USB Playback | No | No |
| Weight | 34 lbs / 15.4 kg | 32 lbs / 14.5 kg |
| Output Power | 3 x 72W | 250W |
| Discontinued | - | Yes |
The Two Speakers In Full
Soundboks 4: $1199 Soundboks Amazon
Pros: Tied for the loudest battery powered speaker. Removable 40 hour battery.
Cons: Very large. Not as neutral or as deep of bass as the above Partyboxes. Not stereo. External power brick for charging.
| App | Yes |
|---|---|
| Aux Input | Yes |
| Bass Extension (-10dB) | 52Hz |
| Battery Life | 40 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.0 |
| Dimensions | 25.6" x 17" x 13" (650.2 x 431.8 x 330.2 mm) |
| Drivers | 2x 10" woofers, 1" compression driver |
| EQ | Yes |
| Frequency Response | 40Hz - 20kHz (Manufacturer specified) |
| Guitar Input | Yes |
| IP Rating | IP65 |
| Max Volume | 126dB |
| Microphone Input | Yes |
| Output Power | 3 x 72W |
| Party Mode | Yes (TeamUp, up to 5 speakers) |
| Power Bank | No |
| Power Input | AC Power cord |
| Removable Battery | Yes |
| SKAA | Yes |
| Stereo | Yes |
| TWS | Yes |
| USB Playback | No |
| Weight | 34 lbs / 15.4 kg |
As an eBay Partner, I may be compensated if you make a purchase.
- Links
- Reviews, Comparisons and Sound Samples
- GYMCADDY: SOUNDBOKS Gen 4 Review - Better Sound And More Power Efficient
- Flossy Carter: SOUNDBOKS 4 - The World’s LOUDEST Bluetooth Speaker!
- Oluv Patreon: SoundBoks 4 vs Stormbox Blast - first impressions
- GYMCADDY: JBL Partybox Ultimate Vs SOUNDBOKS 4 & Sony XV900 - Is It Worth It?
- Reddit Search for Soundboks 4 Review
- Head-to-Head Comparisons
Teufel Rockster Air: €500 Discontinued
Pros: Exceptional 58-hour battery (31 hours at full volume with ECO mode). User-replaceable battery adds real longevity. 112dB loud like live rock concert. Tight bass, solid build, clean full-range guitar output (legitimate practice amp). XLR mic/instrument/aux inputs with companion XLR daisy-chain. USB-A device charging. Party Link Stereo pairs two units wirelessly.
Cons: Peaky midrange, not very natural sounding. Starts to get distorted above half volume. Only available in Europe. Discontinued.
| App | No |
|---|---|
| Aux Input | Yes |
| Bass Extension (-10dB) | ~52Hz |
| Battery Life | 30 hours (Manufacturer specified) |
| Bluetooth Codecs | aptX, SBC |
| Bluetooth Version | 4.0 |
| Dimensions | 11.8" x 21.3" x 11" (300 x 540 x 280 mm) |
| Discontinued | Yes |
| Drivers | 2x 40mm tweeters + 2x 50mm woofers + passive radiators |
| EQ | No |
| IP Rating | None |
| Max Volume | 115dB |
| Output Power | 250W |
| Party Mode | No |
| Power Bank | Yes |
| Power Input | AC Power cord |
| Stereo | Yes |
| TWS | No |
| USB Playback | No |
| Weight | 32 lbs / 14.5 kg |
As an eBay Partner, I may be compensated if you make a purchase.
- Links
- Reviews, Comparisons and Sound Samples
As an Amazon Associate I earn from qualifying purchases. As an eBay Partner, I may be compensated if you make a purchase.
Product prices and availability were last checked August 10, 2026 at 7:14 AM UTC 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.