These sit in different size classes, so this is not a straight ranking comparison. The Marshall Bromley 750 ranks #12 of 12 large party speakers by sound quality at $999.95; the Marshall Stockwell III ranks #71 of 97 large speakers by sound quality at $249.99.
The case for the Marshall Bromley 750: Much wider, more consistent off-axis dispersion than the JBL Partybox 720, which only fires forward: the Marshall’s standout feature, sounding about the same from any angle. Watch for: Not as deep bass as the JBL Partybox 330 or JBL Partybox 720.
The Marshall Stockwell III is the lighter pick. 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 750 at 52.7 lbs (23.9 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 750 ($999.95) for a large 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 750 | Marshall Stockwell III | |
|---|---|---|
| Price | $999.95 | $249.99 |
| Ranked | #12 of 12 in Large Party Size Portable Bluetooth Speakers | #71 of 97 in Large Size Portable Bluetooth Speakers |
| Aux Input | Yes (3.5mm, RCA) | Yes |
| Battery Life | 40+ hours (Manufacturer specified) | 40+ hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC, AAC, LC3 | SBC, AAC, LE Audio with LC3 |
| Guitar Input | Yes | - |
| IP Rating | IP54 | IP55 |
| Microphone Input | Yes (2x XLR/6.35mm combo) | - |
| Power Bank | Yes (USB-C) | Yes |
| Power Input | USB-C | USB-C |
| Weight | 52.7 lbs (23.9 kg) | 2.9 lbs (1.3 kg) |
| XLR Input | Yes (2x combo) | - |
| App | Yes (Marshall Bluetooth app) | Yes |
| Built-in Microphone | No | - |
| EQ | Yes | Yes (parametric, via app) |
| Party Mode | Yes (Auracast) | - |
| Stereo | Yes | Partially |
| Omnidirectional | Yes | Yes |
| TWS | No | No |
| USB Playback | No | - |
| Wi-Fi | No | - |
| Bluetooth Version | 5.3 | 5.3 |
| Dimensions | 16.3” x 25.7” x 14” (413 x 652 x 355 mm) | 7.1” x 6.4” x 2.9” (180 x 162 x 74 mm) |
| Drivers | 2x 10” woofers, 2x 5.25” mid-ranges, 2x 1” tweeters, 2x 0.8” tweeters | 1x 3” woofer, 2x 1.75” wide-band drivers |
| Amplifier Power | 400W | 44W |
| Digital Aux Input | Yes (USB-C) | No |
| Removable Battery | Yes | - |
| Charging Time | 3.5 hours | - |
| Frequency Response | 20Hz - 20kHz (Manufacturer specified) | 54Hz - 20kHz (Manufacturer specified) |
| Lights | Yes | - |
| Strap | No | Yes (detachable strap) |
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- Marshall Stockwell III vs Tribit Stormbox Lava
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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
Marshall Bromley 750: $999.95 Amazon eBay
Pros: Much wider, more consistent off-axis dispersion than the JBL Partybox 720, which only fires forward: the Marshall’s standout feature, sounding about the same from any angle.
Cons: Not as deep bass as the JBL Partybox 330 or JBL Partybox 720. Not a great frequency response overall, with some midrange peaks. Only basic bass/treble controls, no full custom EQ like the JBL Partybox 720’s app. Default bass (dynamic mode) is overdone out of the box and needs trimming.
Full Marshall Bromley 750 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 | 16.3” x 25.7” x 14” (413 x 652 x 355 mm) |
| Drivers | 2x 10” woofers, 2x 5.25” mid-ranges, 2x 1” tweeters, 2x 0.8” tweeters |
| EQ | Yes |
| Frequency Response | 20Hz - 20kHz (Manufacturer specified) |
| Guitar Input | Yes |
| IP Rating | IP54 |
| 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 | 52.7 lbs (23.9 kg) |
| Wi-Fi | No |
| XLR Input | Yes (2x combo) |
- Links
- Reviews, Comparisons and Sound Samples
- Joy & Oluv’Sone: Marshall Bromley 750 vs JBL Partybox 720 - outdoor test More from Oluv’Sone →
- Storytripper HD: W-King T12 vs Marshall Bromley 750 More from storytripperhd →
- Danny Pops: I Finally Got The Marshall Bromley 750 Everyone Wanted More from DannyPops →
- Oluv Patreon: JBL Partybox 720 vs Marshall Bromley 750
- Oluv Patreon: Marshall Bromley 750 - battery issues in the cold
- Oluv Patreon: Marshall Bromley 750 & Teufel Rockster Air 2 - outdoor test
- Oluv Patreon: Marshall Bromley 750 - 2nd look after update
- Oluv Patreon: Marshall Bromley 750 - first impressions
- Head-to-Head Comparisons
- Marshall Bromley 750 vs Sony SRS-XV900
- Marshall Bromley 750 vs Sony ULT Tower 10
- Marshall Bromley 750 vs Sony ULT Tower 9
- Marshall Bromley 750 vs Teufel Rockster
- Marshall Bromley 750 vs JBL Partybox 520
- Marshall Bromley 750 vs JBL Partybox 710
- Marshall Bromley 750 vs JBL Partybox 720
- Marshall Bromley 750 vs Teufel Rockster 2
- See all 24 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
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