Short answer: the Brane X for better sound quality, the Marshall Stockwell III for the lower price. The Brane X ranks #4 of 78 large speakers at $500. The Marshall Stockwell III ranks #56 at $249.99, $250.01 cheaper.
This pits Marshall’s mid-priced portable against a high-end system built around real bass extension. The Stockwell III offers a compact 1.3kg cabinet, parametric EQ, and a 40+ hour battery for $249.99. The Brane X pairs a dedicated subwoofer with midrange drivers and tweeters for a measured 31Hz -10dB bass extension, plus Wi-Fi, AirPlay, and premium Bluetooth codecs, in a 3.5kg cabinet for $500.
Choose the Brane X for bass extension and versatility: Independent testing finds it loud with well-balanced mids and useful bass-level controls, reaching far deeper than the Stockwell III, and its Wi-Fi/AirPlay support and 12-hour battery suit a stationary high-end setup.
Choose the Stockwell III for a lighter, far cheaper speaker: At under half the Brane X’s weight and price, it’s the more practical choice for actually carrying around rather than leaving in one spot.
Buy the Marshall Stockwell III if the price is the priority over sound quality, or the Brane X if sound quality is the priority over the price.
If battery life is a priority, the Marshall Stockwell III is rated for 40 hours versus 12 hours for the Brane X.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Specifications Side By Side
| Marshall Stockwell III | Brane X | |
|---|---|---|
| Price | $249.99 | $500 |
| Ranked | #56 of 78 in Large Size Portable Bluetooth Speakers | #4 of 78 in Large Size Portable Bluetooth Speakers |
| Drivers | 1x 3" woofer, 2x 1.75" wide-band drivers | 2x 2.5" midrange, 2x 0.75" tweeters + 6.5"x9" subwoofer |
| Frequency Response | 54Hz - 20kHz (Manufacturer specified) | 30Hz - 20kHz (Manufacturer specified) |
| Amplifier Power | 44W | 200W |
| Battery Life | 40+ hours (Manufacturer specified) | 12 hours (Manufacturer specified) |
| Bluetooth Version | 5.3 | - |
| Bluetooth Codecs | SBC, AAC, LE Audio with LC3 | aptX HD, aptX, AAC, SBC |
| IP Rating | IP55 | IP57 |
| Weight | 2.9 lbs (1.3 kg) | 7.7 lbs (3.5 kg) |
| Dimensions | 7.1" x 6.4" x 2.9" (180 x 162 x 74 mm) | 9.3" x 7" x 6.1" (236 x 178 x 155 mm) |
| App | Yes | No |
| EQ | Yes (parametric, via app) | No |
| Aux Input | Yes | Yes |
| Digital Aux Input | No | No |
| Power Bank | Yes | No |
| Power Input | USB-C | AC Power brick |
| Stereo | Partially | Yes |
| Omnidirectional | Yes | No |
| Aux Latency | - | 295ms default, 33ms with aux pass-through |
| Bass Extension (-10dB) | - | 31Hz |
| Bluetooth Latency | - | 100ms |
| Maximum SPL | - | 106dB (measured by Alan Ross Reviews) |
| Party Mode | - | Yes (Brane app, up to 8 speakers) |
| TWS | - | Yes |
| Wi-Fi | - | Yes |
| Built-in Microphone | - | Yes |
Related Speaker Comparisons
How Brane X compares with other leading options:
- Brane X vs Vifa Helsinki
- Brane X vs JBL Xtreme 5
- Brane X vs Tribit Stormbox Lava
- Brane X vs Minirig 4 with subwoofer
- Brane X vs Minirig 3 with subwoofer
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
Marshall Stockwell III: $249.99 Marshall eBay
Pros: 40+ hour battery life with a user-replaceable battery, strap, sleeve and grilles. Doubles as a USB-C power bank. IP55 dust/water resistance. App includes parametric EQ, a Soundstage widening control, and wall/corner placement compensation. Endless-rotation control knobs.
Cons: Highs are recessed by default and need the treble control maxed to compensate, still lacking detail even then. Bass tends to sound resonant and boomy, with reported frequency cancellation and phase issues on complex material that EQ doesn’t fully resolve. Oluv’s A/B testing against the outgoing Stockwell 2 finds the default tuning muffled and muddy enough to prefer the seven-year-old original out of the box, and output loses dynamics and bass while turning harsh well below maximum volume. No aptX support.
Full Marshall Stockwell III review and specifications →
| Amplifier Power | 44W |
|---|---|
| App | Yes |
| Aux Input | Yes |
| Battery Life | 40+ hours (Manufacturer specified) |
| Bluetooth Codecs | SBC, AAC, LE Audio with LC3 |
| Bluetooth Version | 5.3 |
| Digital Aux Input | No |
| Dimensions | 7.1" x 6.4" x 2.9" (180 x 162 x 74 mm) |
| Drivers | 1x 3" woofer, 2x 1.75" wide-band drivers |
| EQ | Yes (parametric, via app) |
| Frequency Response | 54Hz - 20kHz (Manufacturer specified) |
| IP Rating | IP55 |
| Omnidirectional | Yes |
| Power Bank | Yes |
| Power Input | USB-C |
| Stereo | Partially |
| Weight | 2.9 lbs (1.3 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Marshall Stockwell III vs Marshall Stockwell 2
- Marshall Stockwell III vs Soundcore Boom 2
- Marshall Stockwell III vs Vifa Oslo
- Marshall Stockwell III vs Minirig 4 with subwoofer
- Marshall Stockwell III vs Tribit Stormbox Lava
- Marshall Stockwell III vs JBL Xtreme 5
- Marshall Stockwell III vs Vifa Helsinki
Brane X: $500 Amazon eBay
Pros: The Brane X pairs a dedicated RAD subwoofer with two midrange drivers and two tweeters to achieve extraordinary low bass for a 3.5kg portable: its measured -10dB extension is 31Hz. Independent testing finds it loud, with well-balanced mids, a smooth treble balance and useful bass-level controls; Wi-Fi, AirPlay, Alexa, quality Bluetooth codecs and low-latency aux pass-through make it unusually versatile. Measured bass extension of 31Hz (-10dB).
Cons: The front-facing design has only moderate dispersion, so sound changes noticeably off to the sides or behind it. Bass response shifts at maximum volume, the default aux mode has very high latency, and some listeners find the upper register edgy or need EQ to achieve their preferred balance. Its claimed 12-hour runtime and premium cost make it more of a compact high-end system than a carefree all-day speaker.
Full Brane X review and specifications →
| Amplifier Power | 200W |
|---|---|
| App | No |
| Aux Input | Yes |
| Aux Latency | 295ms default, 33ms with aux pass-through |
| Bass Extension (-10dB) | 31Hz |
| Battery Life | 12 hours (Manufacturer specified) |
| Bluetooth Codecs | aptX HD, aptX, AAC, SBC |
| Bluetooth Latency | 100ms |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 9.3" x 7" x 6.1" (236 x 178 x 155 mm) |
| Drivers | 2x 2.5" midrange, 2x 0.75" tweeters + 6.5"x9" subwoofer |
| EQ | No |
| Frequency Response | 30Hz - 20kHz (Manufacturer specified) |
| IP Rating | IP57 |
| Maximum SPL | 106dB (measured by Alan Ross Reviews) |
| Omnidirectional | No |
| Party Mode | Yes (Brane app, up to 8 speakers) |
| Power Bank | No |
| Power Input | AC Power brick |
| Stereo | Yes |
| TWS | Yes |
| Weight | 7.7 lbs (3.5 kg) |
| Wi-Fi | Yes |
- Links
- Reviews, Comparisons and Sound Samples
- Alan Ross Reviews: This speaker left me shocked! Brane X, they said it defies the laws of physics! More from alanrossreviews →
- Alan Ross Reviews: Brane X vs JBL Xtreme 5: Maximum Bass, No Mercy
- Alan Ross Reviews: JBL Boombox 4 HUMILIATES Brane X?! Ultimate Bass Battle!
- Alan Ross Reviews: Minirig 2.1 or the Brane X or the Harman Kardon Go Play 3?
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- Head-to-Head Comparisons