Short answer: the Teufel Rockster Cross. It ranks #21 of 78 large speakers by sound quality at $199.99; the Ultimate Ears Epicboom ranks #58 and costs $213.41, so there is not much of a tradeoff to weigh.
What the Teufel Rockster Cross offers: Pretty neutral frequency response. More vocal/midrange-focused than the JBL Xtreme 4, thanks to a larger mid/bass driver - better suited to rock and jazz. Nicer upper-bass detail than the JBL Xtreme 4. Punchy, well-controlled bass that suits rock music, unlike the Soundcore Boom 2 Plus’s overboosted, uncontrolled bass even at stock tuning. Clear, detailed audio with good vocal presence and solid Bluetooth codec support even a couple years after release. Watch for: Outdoor mode can sound somewhat harsh due to the 4khz peak. Not as deep or full-sounding in the bass as the JBL Xtreme 4.
What the Ultimate Ears Epicboom offers: 17 hour battery with USB-C charging (first UE portable with USB-C). IP67 rating, floats in water. Made mostly from recycled fabric and plastic. Large best-sounding UE portable that still feels portable. 180ft Bluetooth range. Watch for: Not very deep bass for the size. Gets distorted at around 70-80% with bass thuds.
Buy the Teufel Rockster Cross. It ranks higher for sound quality than the Ultimate Ears Epicboom and costs less, which settles it without a real tradeoff to make.
Want more options? Browse the full Portable Bluetooth rankings.
Specifications Side By Side
| Teufel Rockster Cross | Ultimate Ears Epicboom | |
|---|---|---|
| Price | $199.99 | $213.41 |
| Ranked | #21 of 78 in Large Size Portable Bluetooth Speakers | #58 of 78 in Large Size Portable Bluetooth Speakers |
| Aux Input | Yes | Yes |
| Bass Extension (-10dB) | 51Hz | ~55Hz |
| Battery Life | 16 hours (Manufacturer specified) | 17 hours (Manufacturer specified) |
| IP Rating | IPX5 | IPX7 |
| Power Input | DC barrel jack | USB-C |
| TWS | Yes | Yes |
| Weight | 5.3 lbs (2.4 kg) | 4.3 lbs (1.97 kg) |
| App | No | No |
| Bluetooth Codecs | SBC, aptX | SBC |
| Built-in Microphone | Yes | Yes |
| EQ | No | No |
| Party Mode | No | No |
| Power Bank | Yes (USB-A) | No |
| Stereo | Partially | Yes |
| Omnidirectional | No | No |
| Bluetooth Version | 5.0 | 5.2 |
| Dimensions | 15" x 6.3" x 5.1" (380 x 160 x 130 mm) | 4.7" x 9.5" x 6.4" (119 x 241 x 162 mm) |
| Drivers | 5" woofer, 2x textile dome tweeters + 2x passive radiators | 1x 120mm woofer, 2x 45mm tweeters |
| Frequency Response | 50Hz - 20kHz (Manufacturer specified) | 50Hz - 20kHz (Manufacturer specified) |
| Amplifier Power | 30W | 10W RMS |
| Digital Aux Input | No | No |
| Maximum SPL | - | 94dB (Manufacturer specified) |
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Prices on this page were last checked September 16, 2026 at 12:41 AM 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 Rockster Cross: $199.99 Amazon eBay
Pros: Pretty neutral frequency response. More vocal/midrange-focused than the JBL Xtreme 4, thanks to a larger mid/bass driver - better suited to rock and jazz. Nicer upper-bass detail than the JBL Xtreme 4. Punchy, well-controlled bass that suits rock music, unlike the Soundcore Boom 2 Plus’s overboosted, uncontrolled bass even at stock tuning. Clear, detailed audio with good vocal presence and solid Bluetooth codec support even a couple years after release. Measured bass extension of 51Hz (-10dB).
Cons: Outdoor mode can sound somewhat harsh due to the 4khz peak. Not as deep or full-sounding in the bass as the JBL Xtreme 4.
Full Teufel Rockster Cross review and specifications →
| Amplifier Power | 30W |
|---|---|
| App | No |
| Aux Input | Yes |
| Bass Extension (-10dB) | 51Hz |
| Battery Life | 16 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC, aptX |
| Bluetooth Version | 5.0 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 15" x 6.3" x 5.1" (380 x 160 x 130 mm) |
| Drivers | 5" woofer, 2x textile dome tweeters + 2x passive radiators |
| EQ | No |
| Frequency Response | 50Hz - 20kHz (Manufacturer specified) |
| IP Rating | IPX5 |
| Omnidirectional | No |
| Party Mode | No |
| Power Bank | Yes (USB-A) |
| Power Input | DC barrel jack |
| Stereo | Partially |
| TWS | Yes |
| Weight | 5.3 lbs (2.4 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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Ultimate Ears Epicboom: $213.41 Amazon eBay
Pros: 17 hour battery with USB-C charging (first UE portable with USB-C). IP67 rating, floats in water. Made mostly from recycled fabric and plastic. Large best-sounding UE portable that still feels portable. 180ft Bluetooth range. Measured bass extension of ~55Hz (-10dB).
Cons: Not very deep bass for the size. Gets distorted at around 70-80% with bass thuds.
Full Ultimate Ears Epicboom review and specifications →
| Amplifier Power | 10W RMS |
|---|---|
| App | No |
| Aux Input | Yes |
| Bass Extension (-10dB) | ~55Hz |
| Battery Life | 17 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.2 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 4.7" x 9.5" x 6.4" (119 x 241 x 162 mm) |
| Drivers | 1x 120mm woofer, 2x 45mm tweeters |
| EQ | No |
| Frequency Response | 50Hz - 20kHz (Manufacturer specified) |
| IP Rating | IPX7 |
| Maximum SPL | 94dB (Manufacturer specified) |
| Omnidirectional | No |
| Party Mode | No |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | Yes |
| TWS | Yes |
| Weight | 4.3 lbs (1.97 kg) |
- Links
- Reviews, Comparisons and Sound Samples
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