Short answer: the Teufel Rockster Cross, on neutrality. The Marshall Kilburn II pairs a 20W Class D amp with dual 8W tweeters and a quick charge that adds 3 hours in 20 minutes, but it boosts upper bass, is not very detailed, goes less deep than competitors and peaks in the upper mids. The Rockster Cross is the more neutral, vocal-focused speaker, though its Outdoor mode can sound harsh from a 4kHz peak and it is less deep than a JBL Xtreme 4.
Buy the Teufel Rockster Cross. It is rated higher for sound quality than the Marshall Kilburn II and costs less, which makes it the one to get unless you need something the other one does better.
If water resistance matters to you, the Teufel Rockster Cross at IPX5 (water jets) holds up far better than the Marshall Kilburn II at IPX2 (light drips).
Want more options? Browse the full Portable Bluetooth rankings.
Specifications Side By Side
| Teufel Rockster Cross | Marshall Kilburn II | |
|---|---|---|
| Price | $249.99 | $279.00 |
| Ranked | #23 of 102 in Large Size Portable Bluetooth Speakers | #43 of 102 in Large Size Portable Bluetooth Speakers |
| Aux Input | Yes | Yes |
| Bass Extension (-10dB) | 51Hz | ~58Hz |
| Battery Life | 16 hours (Manufacturer specified) | 20 hours (Manufacturer specified) |
| IP Rating | IPX5 | IPX2 |
| Power Input | DC barrel jack | USB-C |
| TWS | Yes | Yes |
| Weight | 5.3 lbs (2.4 kg) | 5.5 lbs (2.49 kg) |
| App | No | No |
| Bluetooth | Yes | Yes |
| 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 | 5.0 |
| Dimensions | 15” x 6.3” x 5.1” (380 x 160 x 130 mm) | 9.6” x 6.4” x 5.5” (243 x 162 x 140 mm) |
| Drivers | 5” woofer, 2x textile dome tweeters + 2x passive radiators | 1x 4” (102mm) woofer + 2x 20mm dome tweeters |
| Frequency Response | 50Hz - 20kHz (Manufacturer specified) | - |
| Amplifier Power | 30W | 36W |
| Digital Aux Input | No | No |
| Strap | Yes (detachable shoulder strap) | Yes (built-in strap) |
| Maximum SPL | - | 102dB (Manufacturer specified) |
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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 Rockster Cross: $249.99 Amazon eBay
Newer model: the Teufel Rockster Cross 2, ranked higher, rated 4.2/5.
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 | Yes |
| 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 |
| Strap | Yes (detachable shoulder strap) |
| TWS | Yes |
| Weight | 5.3 lbs (2.4 kg) |
- Links
- Reviews, Comparisons and Sound Samples
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Marshall Kilburn II: $279.00 Amazon eBay
Newer model: the Marshall Kilburn III, ranked higher, rated 3.8/5.
Pros: 20W Class D amp + dual 8W tweeters. 20+ hour battery with quick-charge (20 min charges 3 hours of play). Rugged design with leather handle and reinforced corners, IPX2 rated. Thrives with rock music. Bluetooth 5.0 with 30ft range. Measured bass extension of ~58Hz (-10dB).
Cons: Boosted upper bass, not very detailed, not as deep bass as competitors, upper mids peak. Very low IPX2 water rating. AC charging
Full Marshall Kilburn II review and specifications →
| Amplifier Power | 36W |
|---|---|
| App | No |
| Aux Input | Yes |
| Bass Extension (-10dB) | ~58Hz |
| Battery Life | 20 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.0 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 9.6” x 6.4” x 5.5” (243 x 162 x 140 mm) |
| Drivers | 1x 4” (102mm) woofer + 2x 20mm dome tweeters |
| EQ | No |
| IP Rating | IPX2 |
| Maximum SPL | 102dB (Manufacturer specified) |
| Omnidirectional | No |
| Party Mode | No |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | Yes |
| Strap | Yes (built-in strap) |
| TWS | Yes |
| Weight | 5.5 lbs (2.49 kg) |
- Links
- Reviews, Comparisons and Sound Samples
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