Short answer: the Soundcore Motion X600. It ranks #19 of 97 large speakers by sound quality, rated 4.3/5, at $150; the Marshall Kilburn III ranks #41, rated 3.8/5, and costs $379.99, which makes this an easy call rather than a real tradeoff.
The Soundcore Motion X600 is the better-sounding, tougher option. Firmware 4.2.9 is a big improvement in sound quality over previous releases. It is rated IPX7 against IP54 for the Marshall Kilburn III. It supports LDAC Bluetooth, which the Marshall Kilburn III lacks. Watch for: Stock frequency response is wavy.
The Marshall Kilburn III is the deeper-bass, longer-running pick. Spacious soundstage with broad stereo dispersion from Marshall’s True Stereophonic multi-driver layout, delivering warm, room-filling sound with 45Hz bass extension. Its bass reaches about 45Hz before falling 10dB, against 52Hz for the Soundcore Motion X600. It is rated for 50 hours of battery against 12 for the Soundcore Motion X600. It has an adjustable EQ, which the Soundcore Motion X600 lacks. The catch: Noticeable dips in the midrange compromise frequency response neutrality, making vocals and acoustic instruments sound somewhat recessed or muffled compared to more linear competitors like the JBL Xtreme 4 unless the bass dial is dialed back.
Buy the Soundcore Motion X600. It is rated higher for sound quality than the Marshall Kilburn III and costs less, so it is the default pick unless a specific strength of the other one matters more to you.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Specifications Side By Side
| Soundcore Motion X600 | Marshall Kilburn III | |
|---|---|---|
| Price | $150 | $379.99 |
| Ranked | #19 of 97 in Large Size Portable Bluetooth Speakers | #41 of 97 in Large Size Portable Bluetooth Speakers |
| Aux Input | Yes | Yes |
| Aux Latency | 0ms | - |
| Bass Extension (-10dB) | 52Hz | 45Hz |
| Battery Life | 12 hours (Manufacturer specified) | 50 hours (Manufacturer specified) |
| IP Rating | IPX7 | IP54 |
| Bluetooth Latency | 83ms | - |
| Maximum SPL | 104dB (measured by Alan Ross Reviews) | 91dB |
| Power Bank | Yes (USB-C) | Yes |
| Power Input | USB-C | USB-C |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 5.2 lbs (2.35 kg) | 6.3 lbs (2.85 kg) |
| App | No | Yes |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | LDAC, SBC | SBC, AAC |
| Built-in Microphone | Yes | No |
| EQ | No | Yes |
| Party Mode | Yes (PartyCast up to 100 speakers) | Yes (Auracast) |
| Bluetooth Version | 5.3 | 5.3 |
| Dimensions | 11.8” x 4.8” x 3.2” (300 x 121 x 81 mm) | 10.7” x 5.9” x 6.7” (272 x 150 x 170 mm) |
| Drivers | 2x 60mm woofers, 2x 27mm tweeters, 1x 50mm upward-firing driver | 1x 4” woofer + 2x 2” full-range drivers |
| Frequency Response | 50Hz - 40kHz (Manufacturer specified) | 45Hz - 20kHz |
| Amplifier Power | 50W | 50W |
| Digital Aux Input | No | No |
| Strap | No | Yes (built-in strap) |
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- Soundcore Motion X600 vs Minirig 4 with subwoofer
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 X600: $150 Amazon B&H Photo Video eBay
Pros: Firmware 4.2.9 is a big improvement in sound quality over previous releases. Try this Oluv EQ for the best sound quality. Measured bass extension of 52Hz (-10dB).
Cons: Stock frequency response is wavy. Use spatial mode for best sound quality. Need a different EQ for each volume step. Dip in the upper bass around 120Hz. Rising frequency response, treble a little hot. Would be ranked around #20 without the Oluv EQ. Even with the Oluv EQ the bass isn’t very deep and the sound is still a little unnatural.
Full Soundcore Motion X600 review and specifications →
| Amplifier Power | 50W |
|---|---|
| App | No |
| Aux Input | Yes |
| Aux Latency | 0ms |
| Bass Extension (-10dB) | 52Hz |
| Battery Life | 12 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | LDAC, SBC |
| Bluetooth Latency | 83ms |
| Bluetooth Version | 5.3 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 11.8” x 4.8” x 3.2” (300 x 121 x 81 mm) |
| Drivers | 2x 60mm woofers, 2x 27mm tweeters, 1x 50mm upward-firing driver |
| EQ | No |
| Frequency Response | 50Hz - 40kHz (Manufacturer specified) |
| IP Rating | IPX7 |
| Maximum SPL | 104dB (measured by Alan Ross Reviews) |
| Omnidirectional | No |
| Party Mode | Yes (PartyCast up to 100 speakers) |
| Power Bank | Yes (USB-C) |
| Power Input | USB-C |
| Stereo | Yes |
| Strap | No |
| TWS | Yes |
| Weight | 5.2 lbs (2.35 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Alan Ross Reviews: Soundcore Motion X600 now tuned by Alan Ross (sort of) Not clickbait! More from alanrossreviews →
- Alan Ross Reviews: breaking news…..Soundcore Motion X600 with LDAC and spatial audio!
- Alan Ross Reviews: Spatial Audio: Soundcore Motion X600 Vs Tribit Stormbox Blast
- Alan Ross Reviews: Soundcore Motion x600 (best speaker ever) or two motion booms?
- Alan Ross Reviews: Craziest firmware update ever - Soundcore Motion X600 3.2.8/4.2.8 🤦♀️
- Oluv Patreon: SoundCore Motion X600 vs VIFA Helsinki More from Oluv’Sone →
- NeverEnoughTech: soundcore Motion X600 vs. Sonos Move vs. Bose Soundlink Revolve II
- Jay’s Straight Up Reviews & More: TREBLAB HD-360 (360° Sound) vs Soundcore Motion X600 (Spatial Sound)😮💨 Cornered in Basement Kitchen More from JaysStraightUpReviews →
- Mateusz Cholewa: BOGASING S8 Pro MAX KILLER? vs Soundcore Motion X600 More from Mateusz Cholewa →
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Marshall Kilburn III: $379.99 Amazon eBay
Older model: the Marshall Kilburn II (ranked lower, rated 3.8/5).
Pros: Spacious soundstage with broad stereo dispersion from Marshall’s True Stereophonic multi-driver layout, delivering warm, room-filling sound with 45Hz bass extension. Independent physical bass and treble dials allow quick tonal adjustments on the fly, backed by app-based EQ and placement compensation. Battery life is outstanding at up to 50+ hours with USB-C power-bank charging, IP54 splash resistance, 3.5mm aux input, and Bluetooth 5.3 with Auracast broadcast support. Measured bass extension of 45Hz (-10dB).
Cons: Noticeable dips in the midrange compromise frequency response neutrality, making vocals and acoustic instruments sound somewhat recessed or muffled compared to more linear competitors like the JBL Xtreme 4 unless the bass dial is dialed back. Kilburn II retains slightly punchier perceived loudness at maximum volume due to a more aggressive V-shaped contour. At 2.85 kg with only IP54 splash resistance, it is heavy and cannot withstand water immersion. Lacks a built-in microphone and LDAC codec support.
Full Marshall Kilburn III review and specifications →
| Amplifier Power | 50W |
|---|---|
| App | Yes |
| Aux Input | Yes |
| Bass Extension (-10dB) | 45Hz |
| Battery Life | 50 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC, AAC |
| Bluetooth Version | 5.3 |
| Built-in Microphone | No |
| Digital Aux Input | No |
| Dimensions | 10.7” x 5.9” x 6.7” (272 x 150 x 170 mm) |
| Drivers | 1x 4” woofer + 2x 2” full-range drivers |
| EQ | Yes |
| Frequency Response | 45Hz - 20kHz |
| IP Rating | IP54 |
| Maximum SPL | 91dB |
| Omnidirectional | No |
| Party Mode | Yes (Auracast) |
| Power Bank | Yes |
| Power Input | USB-C |
| Stereo | Yes |
| Strap | Yes (built-in strap) |
| TWS | Yes |
| Weight | 6.3 lbs (2.85 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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