Short answer: the Partybox 520 if you want JBL’s app, EQ, and lightshow at a lower price; the Bromley 750 if all-day battery life and even room coverage matter more. These rank #12 and #7 out of 12 large-party speakers, at $999.95 and $799.95, with the Bromley 750 costing $200 more.
Battery life is the biggest gap here. The Bromley 750 is rated for 40-plus hours against the Partybox 520’s 15 - currently the biggest battery-powered JBL - despite the two being rated at the same 400W output. The Bromley 750 also disperses sound more evenly in every direction, where JBL’s Partybox line tends to fire mostly forward.
The Partybox 520 answers with tuning control and value. It has a proper app with a 5-band EQ and Auracast pairing, while the Bromley 750 only offers basic bass and treble sliders - and its own notes flag a frequency response that isn’t great, with some midrange peaks. The Partybox 520 also costs noticeably less.
Both are wheeled, handle-equipped party speakers with guitar and karaoke-style mic inputs, and the Bromley 750 adds true XLR-level connectivity the Partybox 520 doesn’t match.
Buy the Partybox 520 for the lower price and real EQ control. Buy the Bromley 750 if the much longer battery and even dispersion are worth the extra cost to you.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
Specifications Side By Side
| Marshall Bromley 750 | JBL Partybox 520 | |
|---|---|---|
| Price | $999.95 | $799.95 |
| Ranked | #12 of 12 in Large Party Size Portable Bluetooth Speakers | #7 of 12 in Large Party Size Portable Bluetooth Speakers |
| Aux Input | Yes (3.5mm, RCA) | Yes |
| Battery Life | 40+ hours (Manufacturer specified) | 15 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC, AAC, LC3 | SBC |
| Guitar Input | Yes | Yes |
| IP Rating | IP54 | IPX4 |
| Microphone Input | Yes (2x XLR/6.35mm combo) | Yes (Karaoke mode with echo effect) |
| Power Bank | Yes (USB-C) | Yes (USB-C) |
| Power Input | USB-C | AC Power cord |
| Weight | 52.7 lbs (23.9 kg) | 56.2 lbs (25.5 kg) |
| XLR Input | Yes (2x combo) | - |
| App | Yes (Marshall Bluetooth app) | Yes |
| Built-in Microphone | No | No |
| EQ | Yes | Yes (5 band) |
| Party Mode | Yes (Auracast) | Yes (Auracast) |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| TWS | No | Yes |
| USB Playback | No | Yes |
| Wi-Fi | No | No |
| Bluetooth Version | 5.3 | 5.4 |
| Dimensions | 16.3” x 25.7” x 14” (413 x 652 x 355 mm) | 16.3” x 30.3” x 14.5” (415 x 769 x 369 mm) |
| Drivers | 2x 10” woofers, 2x 5.25” mid-ranges, 2x 1” tweeters, 2x 0.8” tweeters | 2x 7.5” woofer, 2x 1” dome tweeter |
| Amplifier Power | 400W | 400W |
| Digital Aux Input | Yes (USB-C) | No |
| Removable Battery | Yes | Yes |
| Charging Time | 3.5 hours | - |
| Frequency Response | 20Hz - 20kHz (Manufacturer specified) | - |
| Discontinued | No | - |
| Lights | Yes | Yes |
| Strap | No | No |
| Wheels | - | Yes |
Related Speaker Comparisons
More worthwhile head-to-heads for JBL Partybox 520:
- JBL Partybox 520 vs Sony ULT Tower Max
- JBL Partybox 520 vs JBL Partybox Ultimate
- JBL Partybox 1000 vs JBL Partybox 520
- Teufel Rockster 2 vs JBL Partybox 520
- JBL Partybox 520 vs JBL Partybox 720
Prices on this page were last checked September 26, 2026 at 11:14 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.
As an eBay Partner, we may be compensated if you make a purchase.
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 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 |
| Lights | Yes |
| Microphone Input | Yes (2x XLR/6.35mm combo) |
| Omnidirectional | No |
| 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 710
- Marshall Bromley 750 vs JBL Partybox 720
- Marshall Bromley 750 vs Teufel Rockster 2
- Marshall Bromley 750 vs JBL Partybox 1000
- See all 16 comparisons
JBL Partybox 520: $799.95 Amazon B&H Photo Video eBay
Pros: JBL’s biggest battery-powered PartyBox combines very high output, deep chesty bass, wheels and a telescoping handle with a capable app EQ, lights, USB-C audio and mic/instrument inputs. RTINGS finds it loud enough for backyards and unusually well-equipped for a battery party speaker.
Cons: It is very large and heavy, Bluetooth latency is high for video, and its front-facing design loses much of the mids and treble to people off to the sides. The bass-heavy default can also make dialogue less clear without EQ.
Full JBL Partybox 520 review and specifications →
| Amplifier Power | 400W |
|---|---|
| App | Yes |
| Aux Input | Yes |
| Battery Life | 15 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.4 |
| Built-in Microphone | No |
| Digital Aux Input | No |
| Dimensions | 16.3” x 30.3” x 14.5” (415 x 769 x 369 mm) |
| Drivers | 2x 7.5” woofer, 2x 1” dome tweeter |
| EQ | Yes (5 band) |
| Guitar Input | Yes |
| IP Rating | IPX4 |
| Lights | Yes |
| Microphone Input | Yes (Karaoke mode with echo effect) |
| Omnidirectional | No |
| Party Mode | Yes (Auracast) |
| Power Bank | Yes (USB-C) |
| Power Input | AC Power cord |
| Removable Battery | Yes |
| Stereo | Yes |
| Strap | No |
| TWS | Yes |
| USB Playback | Yes |
| Weight | 56.2 lbs (25.5 kg) |
| Wheels | Yes |
| Wi-Fi | No |
- Links
- Reviews, Comparisons and Sound Samples
- Oluv Patreon: JBL Partybox 520 & 720 - indoor listening session More from Oluv’Sone →
- Oluv Patreon: JBL Partybox 520 vs 720 - outdoor test
- Oluv Patreon: JBL Partybox 320 vs 520 - indoor listening session
- Oluv Patreon: JBL Partybox 320 vs 520 - outdoor test
- Oluv Patreon: JBL Partybox 520 vs Teufel Rockster Neo
- Oluv Patreon: W-King T12 vs JBL Partybox 520
- AudioTribe: JBL PartyBox 520 Loudness & BASS Test Will Shock You!
- GYMCADDY: JBL Partybox 720 Vs JBL Partybox 520 More from GYMCADDY →
- AudioTribe: JBL Partybox 720 vs JBL Partybox 520 Who’s Better?
- M1MTechChannel: Welche JBL Partybox ist die BESTE ? Alle Partyboxen im Vergleich | 2026 More from M1MTechChannel →
- Head-to-Head Comparisons
- JBL Partybox 520 vs Teufel Rockster
- JBL Partybox 520 vs JBL Partybox 710
- JBL Partybox 520 vs JBL Partybox 720
- JBL Partybox 520 vs Sony ULT Tower 9
- JBL Partybox 520 vs Sony ULT Tower 10
- JBL Partybox 520 vs Teufel Rockster 2
- JBL Partybox 520 vs JBL Partybox 1000
- JBL Partybox 520 vs Sony SRS-XV900
- See all 15 comparisons