Short answer: the Soundcore Motion X500 for balance and stereo drivers. Its 40W stereo three-driver layout is a little bright on top, but a custom EQ can flatten things out. The Marshall Kilburn II pairs a 20W Class D amp with dual 8W tweeters, yet runs boosted upper bass, an upper mids peak and is not very detailed, with bass not as deep as competitors.
Buy the Soundcore Motion X500. 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.
Battery life favors the Marshall Kilburn II: rated for 20 hours against 12 hours for the Soundcore Motion X500.
If water resistance matters to you, the Soundcore Motion X500 at IPX7 (brief submersion) 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
| Soundcore Motion X500 | Marshall Kilburn II | |
|---|---|---|
| Price | $99.99 | $279.00 |
| Ranked | #27 of 93 in Large Size Portable Bluetooth Speakers | #39 of 93 in Large Size Portable Bluetooth Speakers |
| App | Yes | No |
| Bass Extension (-10dB) | 48Hz | ~58Hz |
| Battery Life | 12 hours (Manufacturer specified) | 20 hours (Manufacturer specified) |
| EQ | Yes | No |
| IP Rating | IPX7 | IPX2 |
| Maximum SPL | 104dB (measured by Alan Ross Reviews) | 102dB (Manufacturer specified) |
| Party Mode | No | No |
| Power Input | USB-C | USB-C |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 4.6 lbs (2.1 kg) | 5.5 lbs (2.49 kg) |
| Aux Input | Yes | Yes |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | LDAC, SBC | SBC |
| Built-in Microphone | Yes | Yes |
| Power Bank | No | No |
| Bluetooth Version | 5.3 | 5.0 |
| Dimensions | 8.7” x 8” x 3.2” (220 x 202 x 81 mm) | 9.6” x 6.4” x 5.5” (243 x 162 x 140 mm) |
| Drivers | 2x 58mm (2.3”) forward-firing full-range drivers + 1x 43mm (1.7”) upward-firing driver | 1x 4” (102mm) woofer + 2x 20mm dome tweeters |
| Frequency Response | 50Hz - 40kHz (Manufacturer specified) | - |
| Amplifier Power | 40W | 36W |
| Digital Aux Input | No | No |
| Strap | No | Yes (built-in strap) |
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Prices on this page were last checked October 2, 2026 at 10:18 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
Soundcore Motion X500: $99.99 Amazon eBay
Pros: 40W stereo with 3-driver layout (two tweeters + woofer). IPX7 weatherproof rating. Compact and very portable. Fine build quality at this price. Spatial Dynamic mode provides immersive sound. Gets close to 12 hour battery claim. Measured bass extension of 48Hz (-10dB).
Cons: A little bright on top, a custom EQ can flatten things out a bit. Peaks at 250Hz and dip at 1kHz
Full Soundcore Motion X500 review and specifications →
| Amplifier Power | 40W |
|---|---|
| App | Yes |
| Aux Input | Yes |
| Bass Extension (-10dB) | 48Hz |
| Battery Life | 12 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | LDAC, SBC |
| Bluetooth Version | 5.3 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 8.7” x 8” x 3.2” (220 x 202 x 81 mm) |
| Drivers | 2x 58mm (2.3”) forward-firing full-range drivers + 1x 43mm (1.7”) upward-firing driver |
| EQ | Yes |
| Frequency Response | 50Hz - 40kHz (Manufacturer specified) |
| IP Rating | IPX7 |
| Maximum SPL | 104dB (measured by Alan Ross Reviews) |
| Omnidirectional | No |
| Party Mode | No |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | Yes |
| Strap | No |
| TWS | Yes |
| Weight | 4.6 lbs (2.1 kg) |
- Links
- Reviews, Comparisons and Sound Samples
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Marshall Kilburn II: $279.00 Amazon eBay
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
- Head-to-Head Comparisons
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