These are not really the same size class, and that is the honest framing here. The Marshall Bromley 450 ranks #24 of 44 party speakers by sound quality at $649.95; the Marshall Stockwell III ranks #71 of 97 large speakers by sound quality at $249.99.
What the Marshall Bromley 450 does well: A balanced, warm sound with a flat midrange that keeps vocals and instruments clear, plenty of bass rumble and enough treble for energetic vocals, per RTINGS’ lab tests. The tradeoff: It is the quietest of its rivals: both the Soundboks Mix and Teufel Rockster Air 2 play louder, and near max volume the bass recedes and the sound gets less composed.
The Marshall Stockwell III is the lighter choice. 40+ hour battery life with a user-replaceable battery, strap, sleeve and grilles. At 2.9 lbs (1.3 kg) it weighs much less than the Marshall Bromley 450 at 27.1 lbs (12.3 kg). Watch for: Highs are recessed by default and need the treble control maxed to compensate, still lacking detail even then.
Buy the Marshall Bromley 450 ($649.95) for a party speaker; the Marshall Stockwell III ($249.99) suits a large speaker instead.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Specifications Side By Side
| Marshall Bromley 450 | Marshall Stockwell III | |
|---|---|---|
| Price | $649.95 | $249.99 |
| Ranked | #24 of 44 in Party Size Portable Bluetooth Speakers | #71 of 97 in Large Size Portable Bluetooth Speakers |
| Amplifier Power | 400W | 44W |
| Drivers | 2x 6.5” woofers, 4x 2” full-range drivers, 2 passive radiators | 1x 3” woofer, 2x 1.75” wide-band drivers |
| Frequency Response | 42Hz - 20kHz (Manufacturer specified) | 54Hz - 20kHz (Manufacturer specified) |
| Battery Life | 40+ hours (Manufacturer specified) | 40+ hours (Manufacturer specified) |
| Charging Time | 3.5 hours | - |
| Removable Battery | Yes | - |
| IP Rating | IP55 | IP55 |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 5.3 | 5.3 |
| Bluetooth Codecs | SBC, AAC, LC3 | SBC, AAC, LE Audio with LC3 |
| Aux Input | Yes (3.5mm, RCA) | Yes |
| Digital Aux Input | Yes (USB-C) | No |
| Microphone Input | Yes (2x XLR/6.35mm combo) | - |
| XLR Input | Yes (2x combo) | - |
| Guitar Input | Yes | - |
| Power Bank | Yes (USB-C) | Yes |
| Power Input | USB-C | USB-C |
| App | Yes (Marshall Bluetooth app) | Yes |
| EQ | Yes | Yes (parametric, via app) |
| Party Mode | Yes (Auracast) | - |
| Built-in Microphone | No | - |
| USB Playback | No | - |
| Wi-Fi | No | - |
| TWS | No | No |
| Lights | Yes | - |
| Weight | 27.1 lbs (12.3 kg) | 2.9 lbs (1.3 kg) |
| Dimensions | 14.4” x 19.4” x 10.3” (366 x 492 x 261 mm) | 7.1” x 6.4” x 2.9” (180 x 162 x 74 mm) |
| Stereo | Yes | Partially |
| Omnidirectional | Yes | Yes |
| Strap | No | Yes (detachable strap) |
| Wheels | No | - |
Related Speaker Comparisons
How Marshall Bromley 450 compares with other leading options:
- Sony ULT Tower 7 vs Marshall Bromley 450
- JBL Partybox 330 vs Marshall Bromley 450
- JBL Partybox Stage 320 vs Marshall Bromley 450
- JBL Partybox 310 vs Marshall Bromley 450
- Sony ULT Tower 5 vs Marshall Bromley 450
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
Marshall Bromley 450: $649.95 Amazon B&H Photo Video eBay
Pros: A balanced, warm sound with a flat midrange that keeps vocals and instruments clear, plenty of bass rumble and enough treble for energetic vocals, per RTINGS’ lab tests. Drivers on all four sides keep the tonal balance nearly the same from any angle, and M1M Tech Channel found it more open and airy than the Soundboks Mix and Teufel Rockster Air 2, with deeper bass than both. RTINGS measured 18.8 hours of battery from a swappable LiFePO4 pack shared with the Bromley 750, and it adds IP55 protection, two XLR/6.35mm combo inputs, USB-C audio, Auracast and physical bass and treble knobs.
Cons: It is the quietest of its rivals: both the Soundboks Mix and Teufel Rockster Air 2 play louder, and near max volume the bass recedes and the sound gets less composed. The warm tuning lacks some fine treble detail. There is no graphic EQ, only bass and treble knobs, and its stereo spreads left and right channels around the cabinet, so panned elements can land on the wrong side. At 12.3 kg it has a carry handle but no wheels.
Full Marshall Bromley 450 review and specifications →
| Amplifier Power | 400W |
|---|---|
| App | Yes (Marshall Bluetooth app) |
| Aux Input | Yes (3.5mm, RCA) |
| Battery Life | 40+ hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC, AAC, LC3 |
| Bluetooth Version | 5.3 |
| Built-in Microphone | No |
| Charging Time | 3.5 hours |
| Digital Aux Input | Yes (USB-C) |
| Dimensions | 14.4” x 19.4” x 10.3” (366 x 492 x 261 mm) |
| Drivers | 2x 6.5” woofers, 4x 2” full-range drivers, 2 passive radiators |
| EQ | Yes |
| Frequency Response | 42Hz - 20kHz (Manufacturer specified) |
| Guitar Input | Yes |
| IP Rating | IP55 |
| Lights | Yes |
| Microphone Input | Yes (2x XLR/6.35mm combo) |
| Omnidirectional | Yes |
| Party Mode | Yes (Auracast) |
| Power Bank | Yes (USB-C) |
| Power Input | USB-C |
| Removable Battery | Yes |
| Stereo | Yes |
| Strap | No |
| TWS | No |
| USB Playback | No |
| Weight | 27.1 lbs (12.3 kg) |
| Wheels | No |
| Wi-Fi | No |
| XLR Input | Yes (2x combo) |
- Links
- Reviews, Comparisons and Sound Samples
- RTINGS: Marshall Bromley 450 Review More from Rtings.com →
- M1M Tech Channel: The best in its class? Marshall Bromley 450 vs. Soundboks & Teufel More from M1MTechChannel →
- HeadphoneCheck: Marshall Bromley 450 test
- Tom’s Guide: Marshall Bromley 450 vs Bromley 750 face-off
- Smart Home Sounds: Marshall Bromley 450 review More from Smart Home Sounds →
- Storytripper HD: JBL Partybox 120 vs Marshall Bromley 450 (Indoor) More from storytripperhd →
- Storytripper HD: Marshall Bromley 450 vs Marshall Bromley 750 (outdoor)
- Storytripper HD: Marshall Woburn III vs Marshall Bromley 450
- Head-to-Head Comparisons
- Marshall Bromley 450 vs Soundboks Mix
- Marshall Bromley 450 vs Onn Large Party gen 2
- Marshall Bromley 450 vs Onn Large Party gen 1
- Marshall Bromley 450 vs Onn XL Wireless Party Speaker
- Marshall Bromley 450 vs JBL Partybox 110
- Marshall Bromley 450 vs JBL Partybox 130
- Marshall Bromley 450 vs JBL Partybox Club 120
- Marshall Bromley 450 vs Sony ULT Tower 5
- See all 20 comparisons
Marshall Stockwell III: $249.99 Marshall eBay
Older model: the Marshall Stockwell II (ranked higher, rated 4.5/5).
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 II 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 | Yes |
| 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 |
| Strap | Yes (detachable strap) |
| TWS | No |
| Weight | 2.9 lbs (1.3 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Marshall Stockwell III vs Turtlebox Cub
- Marshall Stockwell III vs Klipsch Detroit
- Marshall Stockwell III vs Tronsmart Force Max
- Marshall Stockwell III vs Doss Soundbox XL
- Marshall Stockwell III vs Xdobo X8 Max
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- Marshall Stockwell III vs Dali Katch G2
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