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 #13 and #8 out of 13 large-party speakers, at $999.99 and $879.95, with the Bromley 750 costing $120.04 more.
Battery life is the biggest gap here. The Bromley 750 is rated for 40-plus hours against the Partybox 520’s 15, 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.
Prices on this page were last checked November 11, 2026 at 3:26 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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Specifications Side By Side
| Marshall Bromley 750 | JBL Partybox 520 | |
|---|---|---|
| Price | $999.99 | $879.95 |
| Ranked | #13 of 13 in Large Party Size Portable Bluetooth Speakers | #8 of 13 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 | Yes | Yes |
| 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 | Yes | 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) | - |
| Lights | Yes | Yes |
| Strap | No | No |
| Wheels | - | Yes |
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