Short answer: the JBL Xtreme for battery life, the Kilburn II for a compact Class D setup. The Kilburn II pairs a 20W Class D amp with dual 8W tweeters, but it has boosted upper bass, is not very detailed, is not as deep in bass as competitors and peaks in the upper mids. The Xtreme’s 15-hour battery comes with issues with bass distortion at high volumes.
Buy the Marshall Kilburn II. It is rated higher for sound quality and still sold new, while the JBL Xtreme is discontinued.
There is a real gap in water resistance: the JBL Xtreme at IPX7 (brief submersion) against the Marshall Kilburn II, which has IPX2 (light drips).
Looking for alternatives? See the complete Portable Bluetooth rankings.
Specifications Side By Side
| JBL Xtreme | Marshall Kilburn II | |
|---|---|---|
| Price | $200 Discontinued | $279.00 |
| Ranked | #70 of 102 in Large Size Portable Bluetooth Speakers | #43 of 102 in Large Size Portable Bluetooth Speakers |
| Aux Input | Yes | Yes |
| Battery Life | 15 hours (Manufacturer specified) | 20 hours (Manufacturer specified) |
| Maximum SPL | 96dB (measured by Alan Ross Reviews) | 102dB (Manufacturer specified) |
| Party Mode | Yes (Connect) | No |
| TWS | No | Yes |
| Weight | 5.3 lbs (2.4 kg) | 5.5 lbs (2.49 kg) |
| App | No | No |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| Built-in Microphone | Yes | Yes |
| EQ | No | No |
| IP Rating | IPX7 | IPX2 |
| Power Bank | No | No |
| Power Input | USB-C | USB-C |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| Bluetooth Version | 4.1 | 5.0 |
| Drivers | 2x 63mm woofers, 2x 35mm tweeters | 1x 4” (102mm) woofer + 2x 20mm dome tweeters |
| Dimensions | 11.1” x 5” x 4.8” (283 x 126 x 122 mm) | 9.6” x 6.4” x 5.5” (243 x 162 x 140 mm) |
| Frequency Response | 70Hz - 20kHz (Manufacturer specified) | - |
| Amplifier Power | 40W | 36W |
| Digital Aux Input | No | No |
| Bass Extension (-10dB) | - | ~58Hz |
| Strap | - | Yes (built-in strap) |
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Prices on this page were last checked October 4, 2026 at 9:58 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
JBL Xtreme: $200 Discontinued eBay
Newer model: the JBL Xtreme 5, ranked higher, rated 4.6/5.
Pros: 15 hour battery. IPX7 water resistance. JBL Connect for pairing with other JBL speakers. Built-in microphone for calls.
Cons: Issues with bass distortion at high volumes. An older speaker outclassed by newer releases of the Xtreme. External AC power brick for charging. Discontinued.
Full JBL Xtreme review and specifications →
| Amplifier Power | 40W |
|---|---|
| App | No |
| Aux Input | Yes |
| Battery Life | 15 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 4.1 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 11.1” x 5” x 4.8” (283 x 126 x 122 mm) |
| Drivers | 2x 63mm woofers, 2x 35mm tweeters |
| EQ | No |
| Frequency Response | 70Hz - 20kHz (Manufacturer specified) |
| IP Rating | IPX7 |
| Maximum SPL | 96dB (measured by Alan Ross Reviews) |
| Omnidirectional | No |
| Party Mode | Yes (Connect) |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | Yes |
| TWS | No |
| Weight | 5.3 lbs (2.4 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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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