Short answer: neither is the bass champion of this class, so pick on the specifics that matter to you - true stereo and power-bank output favor the Bromley 750, lighter weight favors the Soundboks 4. These rank #11 and #28 out of 11 large-party speakers, at $1299.99 and $1199.
Both share a similar weak point. The Soundboks 4’s own notes say it isn’t as neutral or as deep in the bass as the Partybox-class speakers above it, and the Bromley 750’s notes say much the same about its own bass and overall frequency response. Neither is the pick here if deep, neutral bass is the priority - look at the Partybox line or the Electro-Voice Everse speakers instead.
The Bromley 750 has real stereo separation; the Soundboks 4 doesn’t. The Bromley 750’s driver layout is genuine stereo, while the Soundboks 4 is a mono cabinet. The Bromley 750 also has a USB-C power-bank port for charging your phone, which the Soundboks 4 lacks, and slightly more battery life on paper - 40-plus hours against 40.
The Soundboks 4 is lighter and reaches similar peak loudness for its size. At 15.4 kg (34 lbs) it’s well under two-thirds the Bromley 750’s weight, and its high-efficiency driver design is built to reach 2-3x the volume of a typical speaker at the same wattage - the same approach used by Electro-Voice’s Everse line.
Buy the Bromley 750 for true stereo sound and a power-bank port. Buy the Soundboks 4 if you want something noticeably lighter to move around.
If sound quality matters at all to you, skip the Marshall Bromley 750. It ranks near the bottom of the 11 large party speakers, so look higher up the list instead.
Specifications Side By Side
| Marshall Bromley 750 | Soundboks 4 | |
|---|---|---|
| Price | $1299.99 | $1199 |
| Ranked | #11 of 11 in Large Party Size Portable Bluetooth Speakers | #28 of 50 in Party Size Portable Bluetooth Speakers |
| Aux Input | Yes (3.5mm, RCA) | Yes |
| Battery Life | 40+ hours (Manufacturer specified) | 40 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC, AAC, LC3 | SBC |
| Guitar Input | Yes | Yes |
| IP Rating | IP54 | IP65 |
| Microphone Input | Yes (2x XLR/6.35mm combo) | Yes |
| Power Bank | Yes (USB-C) | No |
| Power Input | USB-C | AC Power cord |
| Weight | 52.7 lbs / 23.9 kg | 34 lbs / 15.4 kg |
| XLR Input | Yes (2x combo) | - |
| App | Yes (Marshall Bluetooth app) | Yes |
| Built in Microphone | No | - |
| EQ | Yes | Yes |
| Party Mode | Yes (Auracast) | Yes (TeamUp, up to 5 speakers) |
| Stereo | Yes | Yes |
| TWS | No | Yes |
| USB Playback | No | No |
| Wifi | No | - |
| Bluetooth Version | 5.3 | 5.0 |
| Dimensions | 16.3" x 25.7" x 14" (413 x 652 x 355 mm) | 25.6" x 17" x 13" (650.2 x 431.8 x 330.2 mm) |
| Drivers | 2x 10" woofers, 2x 5.25" mid-ranges, 2x 1" tweeters, 2x 0.8" tweeters | 2x 10" woofers, 1" compression driver |
| Output Power | 400W | 3 x 72W |
| Digital Aux Input | Yes (USB-C) | No |
| Removable Battery | Yes | Yes |
| Charging Time | 3.5 hours | - |
| Frequency Response | 20Hz - 20kHz (Manufacturer specified) | 40Hz - 20kHz (Manufacturer specified) |
| Discontinued | No | - |
| Bass Extension (-10dB) | - | 52Hz |
| Max Volume | - | 126dB |
| SKAA | - | Yes |
The Two Speakers In Full
Marshall Bromley 750: $1299.99 Amazon
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 →
| App | Yes (Marshall Bluetooth app) |
|---|---|
| Aux Input | Yes (3.5mm, RCA) |
| Battery Life | 40+ hours (Manufacturer specified) |
| 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) |
| Discontinued | No |
| 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 |
| Microphone Input | Yes (2x XLR/6.35mm combo) |
| Output Power | 400W |
| Party Mode | Yes (Auracast) |
| Power Bank | Yes (USB-C) |
| Power Input | USB-C |
| Removable Battery | Yes |
| Stereo | Yes |
| TWS | No |
| USB Playback | No |
| Weight | 52.7 lbs / 23.9 kg |
| Wifi | No |
| XLR Input | Yes (2x combo) |
As an eBay Partner, we may be compensated if you make a purchase.
- Links
- Reviews, Comparisons and Sound Samples
- Joy & Oluv’Sone: Marshall Bromley 750 vs JBL Partybox 720 - outdoor test
- Storytripper HD: W-King T12 vs Marshall Bromley 750
- Danny Pops: I Finally Got The Marshall Bromley 750 Everyone Wanted
- 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
- Reddit Search for Marshall Bromley 750 Review
- Head-to-Head Comparisons
- Marshall Bromley 750 vs JBL Partybox 520
- Marshall Bromley 750 vs JBL Partybox 720
- Marshall Bromley 750 vs Teufel Rockster 2
- Marshall Bromley 750 vs JBL Partybox 1000
- Marshall Bromley 750 vs JBL Partybox Ultimate
- Marshall Bromley 750 vs Electro-Voice Everse 12
- Marshall Bromley 750 vs Teufel Rockster Neo
Soundboks 4: $1199 Soundboks Amazon
Pros: Tied for the loudest battery powered speaker. Removable 40 hour battery. High efficiency drivers reach 2-3x the volume of typical speakers for the same wattage.
Cons: Very large. Not as neutral or as deep of bass as the above Partyboxes. Not stereo. External power brick for charging.
Full Soundboks 4 review and specifications →
| App | Yes |
|---|---|
| Aux Input | Yes |
| Bass Extension (-10dB) | 52Hz |
| Battery Life | 40 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.0 |
| Digital Aux Input | No |
| Dimensions | 25.6" x 17" x 13" (650.2 x 431.8 x 330.2 mm) |
| Drivers | 2x 10" woofers, 1" compression driver |
| EQ | Yes |
| Frequency Response | 40Hz - 20kHz (Manufacturer specified) |
| Guitar Input | Yes |
| IP Rating | IP65 |
| Max Volume | 126dB |
| Microphone Input | Yes |
| Output Power | 3 x 72W |
| Party Mode | Yes (TeamUp, up to 5 speakers) |
| Power Bank | No |
| Power Input | AC Power cord |
| Removable Battery | Yes |
| SKAA | Yes |
| Stereo | Yes |
| TWS | Yes |
| USB Playback | No |
| Weight | 34 lbs / 15.4 kg |
As an eBay Partner, we may be compensated if you make a purchase.
- Links
- Reviews, Comparisons and Sound Samples
- GYMCADDY: SOUNDBOKS Gen 4 Review - Better Sound And More Power Efficient
- Flossy Carter: SOUNDBOKS 4 - The World’s LOUDEST Bluetooth Speaker!
- Oluv Patreon: SoundBoks 4 vs Stormbox Blast - first impressions
- GYMCADDY: JBL Partybox Ultimate Vs SOUNDBOKS 4 & Sony XV900 - Is It Worth It?
- Reddit Search for Soundboks 4 Review
- Head-to-Head Comparisons
As an Amazon Associate I earn from qualifying purchases. As an eBay Partner, I may be compensated if you make a purchase.
Product prices and availability were last checked August 12, 2026 at 5:33 PM UTC 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.